ESDIS Acronym List

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  **Acronym**    **Definition**

  1W/2W          one-way, two-way (Doppler Tracking)

  2D             Two Dimensional

  3D             Three-Dimensional

  3GL            Third Generation Language

  4DDA           4-Dimensional Data Assimilation

  4GL            Fourth Generation Language

  A&E            Activation And Evaluation

  A&R            Automation And Robotics

  A&SG           Avionics & Surveillance Group

  A-DAAC         Affiliated-Distributed Active Archive Center

  A/C            Air Conditioning

  A/D            Analog To Digital

  A/S            Anti-Spoofing

  A/SA           Arid/Semi-Arid

  A/SWSWT        ADEOS II/Seawinds Science Working Team

  AA             Astronomical Almanac

  AA             Ancillary Data Access

  AA             Ancillary Data Access ASTER

  AA             Associate Administrator

  AAA            Alarms, Alerts and Advisories

  AABW           Antarctic Bottom Water

  AAG            Association Of American Geographers

  AAL            Asynchronous Transfer Mode Adaptation Layer

  AAL5           Asynchronous Transfer Mode Adaptation Layer 5

  AALE           Adjusted Annual Loss Expectancy

  AAOE           Airborne Antartic Ozone Experiment

  AAP            Advanced Archival Products

  AAPVL          Approval

  AAQS           Ambient Air Quality Standards

  AASE           Airborne Arctic Stratospheric Expedition

  AASE II        Airborne Arctic Stratospheric Expedition II

  AATSR          Advanced Along-Track Scanning Radiometer (ESA)

  AB             Advanced Bus

  ABC++          Document Generator Used To Provide Class Level Detail

  ABCR           As Built Configuration Report

  ABE            Archive Browser And Extractor

  ABI            Application Binary Interface

  ABI            Advanced Baseline Image

  ABL            Allocated Baseline

  ABLE           Atmospheric Boundary Layer Experiment

  ABOM           Austrailian Bureau Of Meteorology

  ABR            Available Bit Rate

  ABS            Oxygen A-Band Spectrometer

  AC             Alternating Current

  AC             Atmospheric Corrector

  ACAD           Attitude Control And Determination

  ACBM           Autonomous Command Block Memory

  ACCA           Automated Cloud Cover Assessment

  ACD            Architectural Control Document

  ACDA           Asociació N Costarricense Para El Desarrollo Aerospacial
                 (Costa Rican Association For Aerospace Development)

  ACDS           Attitude Control Determination Subsystem

  ACE            Aerosol Characterization Experiment

  ACE            Attitude Control Electronics

  ACE            Advanced Composition Explorer

  ACE            Array Clamp Electronics

  ACE            Analog Control Electronics

  ACF            Automated Control Function

  ACFG           Management Agent Configuration File

  ACHP           Advisory Council On Historic Preservation

  ACI            Allocated Configuration Identification

  ACI            Administratively Controlled Information

  ACL            Access Control List

  ACMAP          Atmospheric Chemistry and Modeling Analysis Program

  ACMHW          Access And Control Management Hardware \[Configuration
                 Item\]

  ACP            Archive Control Process

  ACQ            Acquisition

  ACR            Active Cavity Radiometer

  ACRIM          Active Cavity Radiometer Irradiance Monitor

  ACRIMSAT       Active Cavity Radiometer Irradiance Monitor Satellite

  ACRIMSat       Active Cavity Radiometer Irradiance Monitor Satellite

  ACRS/TLAS      Automated Conflict Resolution System/TDRSS Look Angle
                 System

  ACS            Attitude Control System

  ACS            Archived Catalog System (Asf)

  ACS            Activity Schedule

  ACS            Advanced Camera For Surveys

  ACS            Automated Cartridge System

  ACSE           Association Control Service Element

  ACSE           Automated Console System For Library Services

  ACSE           Attitude Control System Electronics

  ACSLS          Automated Cartridge System Library Software

  ACSYS          Arctic Climate System Study

  ACTES          An Associate Of Arts In Community Colleges For Training
                 In Earth Sciences

  ACTS           Advanced Communication Technology Satellite

  ACU            Accelerometer Unit

  ACU            Antenna Control Unit

  ACWP           Acutal Cost Of Work Performed

  AD             Acceptance Check/TC Data

  AD             Applicable Document

  Ada            A Program Language

  ADA            A Programming Language

  ADA            Angular Displacement Assembly

  ADA            Array Drive Assembly

  ADABL          As Designed As Build List

  ADAC           Attitude Determination And Control

  AdaDL          Ada Design Language

  ADADS          ASTER Data Archive And Distribution System

  ADALT          Advanced Radar Altimeter

  ADC            Affiliated Data Center

  ADC            Analog To Digital Converter

  ADC            After Date Of Contract

  Adc            Amperes Direct Current

  ADCLS          Advanced Data Collection And Location System

  ADCS           Attitude Determination and Control Subsystem

  ADD            Architecture Description Document

  ADD            Architecture Design Document

  ADE            Array Drive Electronics

  ADEOS          Advanced Earth Observing System (Japan)

  ADEOS          Advanced Earth Observing Satellite (Japan)

  ADEOS-II       Advanced Earth Observing Satellite II

  ADEOS-II       Advanced Earth Observing System II

  ADEPT          Advanced Design Electronic Packaging Technique

  ADG            Acquisition Data Generator

  ADGE           Air Defense Ground Environment

  ADM            Administrative Message

  ADM            Antenna Drive Mechanism

  ADM            Antenna Deployment Mechanism

  ADM            Angular Distribution Model

  ADN            ASTER Data Network

  ADO            Active Data Object

  ADP            Automated Data Processing

  ADPE           Automated Data Processing Equipment

  ADRO           Application Development Research Opportunity

  ADRS           Automated Defect Reporting System

  ADS            Archive and Distribution Segment

  ADS            Attitude Displacement Sensors

  ADS            Attitude System

  ADS            Archive Data Set

  ADS            Attitude Determination Subsystem

  ADS            Attitude Determination System

  ADS            Ancillary Data Service

  ADS            Angular Displacement Sensor

  ADSERV         Advertising Service

  ADSHW          Advertising Service Hardware \[Configuration Item\]

  ADSL           Asymmetric DSL

  ADSRV          Advertising Service CSCI

  ADT            Abstract Data Type

  ADT            Architectural Development Team

  ADT            Activity Definer Tool

  AE             Atmospheric Explorer

  AEAP           Atmospheirc Effects Of Aviation Program

  AEAP           Atmospheirc Effects Of Aviation Project

  AEB            Brazilian Space Agency

  AEDP           Astrometry And Engineering Data Processing

  AEI            AEI (Solar Array DC-Motor Manufacturer) A Subcontractor
                 To Fokker Space

  AEM            Application Explorer Mission

  AEM            Analog Electronics Module (MODIS)

  AEP            Application Environment Profile

  AER            Atmospheric And Environmental Research

  AERI           Atmospheric Emitted Radiance Interferometer

  AERO           Aerosol

  AEROnet        Aeronautics Network

  AERONET        Aerosol Robotic Network

  AES            Application Environment Specification

  AES            Aerojet Electro Systems

  AES            Atmospheric Environment Service

  AESA           Atmospheric Effects Of Stratospheric Aircraft Program

  AESOPS         Antarctic Environment Southern Ocean Process Study

  AESP           Aerospace Education Services Program

  AET            Actual Evapo-Transpiration

  AETD           Applied Engineering And Technology Directorate

  AF             Audio Frequency

  AFAM           Aura Fall Annual Meeting

  AFB            Air Force Base

  AFC            Application Foundation Class (Microsoft)

  AFD            Architecture Flow Diagrams

  AFE            Annual Frequency Estimate

  AFGWC          Air Force Global Weather Central

  AFM            Aura FSW Maintenance

  AFM            Award Fee Milestone

  AFN            Acquisition Failure Notification

  AFPRO          Air Force Plant And Representative Office

  AFS            Andrews File System

  AFSCF          Air Force Satellite Control Facility

  AFSCN          Air Force Satellite Control Network

  AFWA           Air Force Weather Agency

  AGAGE          Advanced Global Atmospheric Gases Experiment

  AGC            Automatic Gain Control

  AGCI           Aspen Global Change Institute

  AGCM           Atmospheric General Circulation Model

  AGDS           ASTER Ground Data System

  AGE            Aerospace Ground Equipment

  AGE            Associated Ground Elements

  AGL            Above Ground Level

  AGN            Active Galatic Nuclei

  AGP            Ancillary Geographic Product (MISR)

  AGS            ASTER Ground System

  AGS            Alaska Ground Station

  AGU            American Geophysical Union

  AHAP           Alaska High-Altitude Aerial Photography

  AHAP           NASA High Altitude Aerial Photography

  AHM            Attitude Hold Mode

  AHWGC          Ad Hoc Working Group On Consumers

  AHWGP          Ad Hoc Working Group On Production

  AHWGP          Ad Hoc Working Group On Processing

  AI             Artificial Intelligence

  AI&T           Algorithm Integration And Test

  AIAA           American Institute Of Aeronautics And Astronautics

  AICC           ASTER Instrument Control Center

  AID            Ada Information Description

  AID            Architecture Interconnection Diagram

  AIDJEX         Artic Ice Dynamics Joint Experiment

  AIF            Algorithm Integration Facility (Uk)

  AIFF           Type Of Sound File Format

  AIIM           Association For Information And Image Management

  AIM            Automated Information Management

  AIM            Assurance Implementation Matrix

  AIMCO          Automated Information Management Council

  AIR            Airborne Imaging Radar

  AirMISR        Airborne Multi-Angle Imaging Spectroradiometer

  AIRS           Atmospheric Infrared Sounder

  AIRSAR         Aircraft Synthetic Aperture Radar

  AIS            Airborne Imaging Spectrometer

  AIS            Automated Information Security

  AIS            Automated Information System

  AISC           Assessment And Information Services Center

  AISO           Automated Information Security Officer

  AIT            Algorithm Integration Team

  AIT            Algorithm Integration And Test

  AIT            Assembly, Integration & Test (Component Level)

  AITHW          Algorithm Integration And Test Hardware \[Configuration
                 Item\]

  AITT           Algorithm Integration And Test Team

  AITTL          Algorithm Integration And Test CSCI

  AL             Aluminum

  ALDC           Adaptive Lossless Data Compression

  ALDT           Administrative Logistics Delay Time

  ALE            Annual Loss Expectancy

  ALE            Atmospheric Lifetime Experiment

  ALEXIS         Array of Low Energy X-ray Imaging Sensors

  ALG            Algorithm

  ALI            Advanced Land Imager

  ALINK          Active Link (Html)

  ALOG           Application Log File

  ALOS           Advanced Land Observation Satellite

  ALPEX          Alpine Experiment

  ALRSS          Advanced Land Remote Sensing System

  ALS            Archimedial Log Spiral (Omni Antenna)

  ALT            Altimeter

  ALTA           Active Long-Term Archive

  ALTMS          Airborne Lidar Topographic Mapping System

  AM             Morning (Ante Meridiem)

  AM             Assurance Manager

  AM-1           EOS AM Mission Spacecraft 1, Morning Spacecraft Series
                 \-- ASTER, CERES, MISR, MODIS And MOPITT Instruments

  AMAO           Advanced Missions Analysis Office

  AMASS          Archival Management And Storage System

  AMD            Advanced Microdevices (A Company)

  AMDS           Automated Message Distribution System

  AME            Antenna Mounted Equipment

  AMEX           Australian Monsoon Experiment

  AMI            Active Microwave Instrument

  AMIP           Atmospheric Model Intercomparison Project

  AML            Automated Media Library

  AMLS           Array MLS

  AMMS           Acquisition And Material Management System

  AMOC           Am Mission Operations Center

  Amp            Amperes

  AMP            Assurance Management Plan

  AMPE           Automated Message Processing Exchange

  AMPR           Advanced Microwave Precipitation Radiometer

  AMPTE          Active Magnetospheric Particle Tracer Explorer

  AMPU           Attitude Maneuver Planning Utility

  AMR            Altimetry Microwave Radiometer

  AMRC           Auxiliary Master Reference Cube

  AMRIR          Advanced Medium Resolution Imaging Radiometer

  AMS            American Meteorological Society

  AMS            Automated Meteorological Station

  AMS            Automated Message System

  AMS            Archive Management Software

  AMS            ASTER Mission Simulator

  AMSR           Advanced Microwave Sounding Radiometer

  AMSR           Advanced Microwave Scanning Radiometer

  AMSR-CU        Advanced Microwave Scanning Radiometer - Control Unit

  AMSR-E         Advanced Microwave Scanning Radiometer For EOS

  AMSR-SU        Advanced Microwave Scanning Radiometer - Sensor Unit

  AMSU           Advanced Microwave Sounding Unit

  AMSU-A         Advanced Microwave Sounding Unit-A

  AMSU-A1        AMSU-A1 Module - Receives V And W Band Frequencies On
                 Channels 3-15

  AMSU-A2        AMSU-A2 Module - Receives K And Ka Band Frequencies On
                 Channels 1 & 2

  AMSU-B         Advanced Microwave Sounding Unit-B (Earlier MHS, Became
                 HSB)

  AMTS           Advanced Meteorological Temperature Sounding Study

  AMTS           Advanced Meteorological Temperature Sounder

  AMTS           Advanced Moisture And Temperature Sounder

  AMU            Atomic Mass Unit

  ANA            Analysis

  Andes MIS      Andean Morphstectonic Information System

  ANIR           Advanced Networking Infrastructure And Research

  ANSI           American National Standards Institute

  ANZONE         Antartic Zonal Experiment

  Ao             Operational Availability

  AO             Announcement Of Opportunity

  AOC            Award Of Contract

  AOC            Archive Operational Capability

  AOCS           Attitude And Orbit Control System

  AOD            Aerosol Optical Depth

  AOI            Area Of Interest

  AOI            Angle Of Incidence

  AOIPS          Atmospheric And Oceanographic Information Processing
                 System

  AOL            Airborne Oceanographic Lidar

  AOS            Acquisition Of Signal

  AOS            Area Of Search

  AOS            Advanced Orbiting System

  AOS            Archive And Operations System (ASF)

  AOS            ASTER Operations Segment

  AOSP           Advanced On-Board Signal Processor

  AOT            ASTER Operations Team

  AP             Attached Payload

  AP             Algorithm Package

  AP             Accounts Payable

  APA            Allowance For Program Adjustment

  APACM          Atmospherics Physics And Chemistry Monitors

  APAE           Attached Payload Accommodation Equipment

  APAFO          Advanced Particles And Fields Observatory

  APAR           Abosrbed Photosynthetic Active Radiation

  APC            Aft payload Capsule

  APC            Access/Process Coordinators

  APCD           Air Pollution Control District

  APDU           Application Protocol Data Unit

  APFZ           Antarctic Polar Frontal Zone

  API            Application Programming Interface

  APID           Application Process Identifier

  APID           Application (Packet) Identifier

  APID           Application Packet Identifier

  APL            Applied Physics Laboratory (At Johns Hopkins University)

  APOPP          Aerosol Physical And Optical Properties Product

  APP            Applications Protability Profile

  APR            Applied Parallel Research

  APRP           Adaptive Pattern Recognition Processing

  APS            Action Per Second

  APS            Acquisition Planning System

  APT            Automatic Picture Transmission

  APT            Automatice Picture Transmission

  APT            Advanced Picture Taking

  AQA            Algorithm Quality Assurance

  AQAHW          Algorithm QA Hardware (Configuration Item)

  AQAHWCI        Algorithm Quality Assurance Hardware Configuration Item

  AQPSK          Asynchronous Quadrature Phse Shift Keying

  Aqua           Formerly Called The PM Project (Under The Earth Science
                 Enterprise Program)

  AR             Accounts Receivable

  AR             Acquire Request

  AR             Acceptance Review

  AR             Action Request

  AR             Axial Ratio

  ARA            Appletalk Remote Access

  ARA            Atmospheric Radiation Analysis

  ARA            Acquire Request Acknowledgment

  ARAM           Automated Reliability/ Availability/ Maintainability

  ARC            Ames Research Center

  ARC            Antarctic Research Center

  ARC            Applied Research Corporation (ECS Team)

  ARC            Archiver

  arcsec         Arc-Seconds

  ARDB           Automated Requirements Database

  ARE            Array Regulator Electronics (EPS)

  ARE            Array Regulator Electronics

  ARESE          Arm Enhanced Shortwave Experiment

  ARF            Action Request Form

  ARGOS          Argos Data Collection And Position Location System

  ARGOS+         Argos Data Collection And Location System (France)

  ARIA           Advanced Range Instrumentation Aircraft

  ARICS          Accounts Receivable Invoice Control System

  ARIN           Aerospace Resource Information Network

  ARISTOTELES    Applications And Research Involving Space Technologies
                 Observing The Earths\' Field From Low Earth Orbiting
                 Satellite

  ARL            Anomaly Resolution Lead

  ARM            Atmospheric Radiation Measurement (DOE Program)

  ARM            Array Regulator Module

  ARMSAT         Atmospheric Radiation Measurement Satellite

  ARP            Address Resolution Protocols

  ARP            Ancillary Radiometric Product

  ARPA           Advance Research Project Agency

  ARPANET        Advanced Research Project Agency Net

  ARS            Agricultural Research Service

  ARS            Action Request System

  ARTI           Advanced Range Technology Initiative

  ARW            Angle Random Walk

  AS             Advanced Solid, I.E., Atlas Ii As

  AS             Administration Stations

  AS             Access Subgroup (Part Of CEOS-WGISS)

  AS&M           Analytical Services And Materials, Inc.

  ASAP           As Soon As Possible

  ASAR           Advanced Synthetic Aperture Radar (ESA)

  ASAS           Advanced Solid-State Array Spectrometer

  ASCA           Advanced Satellite For Cosmology And Astrophysics

  ASCAT          Advanced Scatterometer

  ASCII          American Standard Code For Information Interchange

  ASCSS          Automatic Spacecraft Configuration Status System

  ASCVR          As Shipped Configuration Verification Report

  ASDC           Atmospheric Sciences Data Center (Langley)

  ASDC           Atmospheric Sciences Data Center

  ASDPS          ASTER Science Data Processing System

  ASE            Airborne Support Equipment

  ASET           Alliance System Engineering Team

  ASF            Alaska SAR Facility (DAAC)

  ASFUWG         ASF User Working Group

  ASHE           Airborne Summer Hemisphere Experiment (NOAA)

  ASHOE          Airborne Southern Hemisphere Ozone Experiment

  ASI            Agenzia Spaziale Italiana

  ASI            Ampere-Second Integration

  ASIC           Application Specific Integrated Circuit

  ASLE           Adjusted Single Loss Expectancy

  ASM            Acquisition Strategy Meeting

  ASM            Attached Sync Marker

  ASM            ASTER System Management

  ASME           American Society Of Mechanical Engineers

  ASMO           Advanced Storage Magneto-Optical

  ASN.1          Abstract Syntax Notation One

  ASP            Alaska SAR Processor

  ASP            Active Server Pages

  ASPRS          American Society For Photogrammetry And Remote Sensing

  ASQC           American Society For Quality Control

  ASRM           Advanced Solid Rocket Motor

  ASSIST         ADPE System Sizing Tool

  ASSY           Assembly

  AST            Algorithm Support Team

  AST            ASTER Science Team

  ASTER          Advanced Spaceborne Thermal Emission and Reflection
                 Radiometer

  ASTER          Advanced Spaceborne Thermal Emission And Reflection
                 Radiometer (Formerly ITIR)

  ASTEX          Atlantic Stratocumulus Transition Experiment

  ASTGW          ASTER Gateway CSCI

  ASTR           Aster

  ASTRO          Astronomy Platform (Shuttle)

  AT             Acceptance Test

  AT&T           American Telephone and Telegraph

  AT&T           American Telephone And Telegrah

  AT/SV          Acceptance Test, System Verification

  ATBD           Algorithm Theoretical Basis Document

  ATC            Absolute Time Command

  ATC            Active Thermal Control

  ATC            Absolute Time Control

  ATCAS          Advanced Technology Composite Aircraft Structures

  ATCI           Agent Client Item

  ATCS           Absolute Time Command Sequence

  ATDRSS         Advanced Tracking And Data Relay Satellite System

  ATE            Automatic Test Equipment

  ATES           Alcatel Espace Systems

  ATG            Aeropsace Test Group

  ATIP           Advanced Technology Initiatives Program

  ATL            Automated Tape Library

  ATLAB          Atmospheric Laboratory

  ATLANTA        Atlanta Land-Use Analysis: Temperature And Air-Quality

  ATLAS          Atmospheric Laboratory For Applications And Science

  ATLAS          Advanced Thermal And Land Applications Sensor

  ATLID          Atmospheric Lidar

  ATM            Asynchronous Transfer Mode

  ATM            Atmospheric Trace Molecule Spectroscope

  ATM            Airborne Terrain Mapping

  ATM            Asynchronous Transmission Mode

  ATMARP         Asynchronous Transfer Mode Address Resolution Protocol

  ATMI           Application Transaction Management Interface

  ATMOS          Atmospheric Observations Satellite

  ATMOS          Atmospheric Trace Molecule Spectroscopy

  ATMP           Acceptance Test Management Plan

  ATMS           Advanced Technology Microwave Sounder

  ATN            Advanced TIROS-N

  ATO            Acceptance Test Organization

  ATP            Acceptance Test Plan

  ATP            Acceptance Test Procedure

  ATP            Acceptance Test Package

  ATP            Automatic Test Procedures

  ATP            Approval To Process (Letter)

  ATP            Authority To Proceed

  ATR            Acceptance Test Review

  ATR            Assistance Technical Representative

  ATRR           Acceptance Test Readiness Review

  ATS            Advanced Technology Satellite

  ATS            Access To Space

  ATSDR          Agency For Toxic Substances And Disease Registry

  ATSR           Along Track Scanning Radiometer (ESA)

  ATT            Acceptance Test Team

  ATT            Automated Test Tool

  ATT/PL         Attached Payload

  AU             Audio Format (Developed For Sun Workstations)

  AUI            Adapter User Interface

  AUI 802.3      10 Base 5 (Thick Ethernet) Interface

  AURIO          Auroral Imaging Observatory

  AUX            Auxiliary

  AVCS           Advanced Vidicon Camera System

  AVG            Average

  AVHRR          Advanced Very High-Resolution Radiometer

  AVHRR GAC      AVHRR Global Coverage Area

  AVHRR LAC      AVHRR Local Area Coverage

  AVIRIS         Airborne Visible And Infrared Imaging Spectrometer

  AVIS           Airborne Vegetation Index Sensor

  AVNIR          Advanced Visible And Near-Infrared Radiometer

  AVR            Automatic Voice Recognition

  AVS            Advanced Visualization System

  AWCS           Agency-Wide Coding System

  AWD            Award

  AWG            American Wire Gauge

  AWIPS-90       Advanced Weather Interactive Processing System For The
                 90\'s

  AWN            Angle White Noise

  AWOTS          Automated Wallops Orbital Tracking Station

  AWS            Automatic Weather Stations

  AWT            Abstract Windowing Toolkit (Java)

  AXAF           Advanced X-Ray Astrophysics Facility

  AZ/EL          Azimuthal / Elevation

  B&A            Billing And Accounting

  B-Dot          Rate Of Change Of Earth's Magnetic Field

  B-ISDN         Broadland Integrated Services Digital Network

  B-R            Build and Release

  B.0            Release B.0

  B.1            Release B.1

  B/U            Backup

  B0SOT          Release B.0 Search And Order Tool

  BAAS           Billing/Accounting Application Service

  BAH            Booz Allen and Hamilton

  BAHC           Biospherics Aspects Of The Hydrologic Cycle (IGBP)

  BALTEX         Baltic Sea Experiment

  BAP            Baseline Activity Profile

  BARC           Beltsville Agricultural Research Center

  BASC           Board On Atmospheric Science And Climate (NRC)

  BASIC          Bay Area Shared Information Consortium

  BAT            Bench Acceptance Test

  BATC           Ball Aerospace & Technologies Corp.

  BATS           Biosphere-Atmosphere Transfer Model

  BATSE          Burst And Transient Source Experiment

  BB             Broadband

  BB             Blackbody

  BB             Bulletin Board

  BBS            Bulletin Board Server

  BBS            Bulletin Board Service

  BBS            Bulletin Board System

  BBU            Baseband Unit

  BC             Bus Controller

  BC             Bypass Check/Control Commands

  BCC            Biogeochemical Models

  BCC            Backup Satellite Control Center

  BCH            Bose-Chaudhuri-Horquengham

  BCH            Binary Coded Hexadecimal

  BCMP           A Type Of Quering Network

  BCN            Backbone Concentrator Node

  BCU            Bus Control Unit

  BDA            Bermuda, Ground Network Station, U.K.

  BDDN           Broadcast Data Distribution Node

  BDDS           Broadcast Data Distribution System

  BDF            Bi-Directional Reflective Factor

  BDS            Bi-Directional Scan Product (CERES)

  BDU            Bus Data Unit

  BED            Block Error Detection

  BER            Bit Error Rate

  BET            Best Estimated Trajectory

  BFTP           Batch FTP

  BGCOLOR        Background Color (HTML)

  BGP            Boundary Gateway Protocol

  BI             Battery-Imbalance fault

  Bin            Binary, Consisting Of 0 And 1 Data Bits

  BIOME          Biogeochemical Information Ordering Management
                 Environment

  BIOS           Basic Input/Output System (Pc)

  BIPS           Billion Instructions Per Second

  BIT            Built In Test

  BITNET         Because It's Time Network

  BIU            Bus Interface Unit

  BLE            Ball Lead Engineer

  BLM            Bureau Of Land Management

  BLOB           Binary Large Object

  BLP            Ball Lead Planner

  BMA            Battery Module Assembly

  BMGT           Bulk Metadata Generation Tool

  BNF            Backus-Nauer Format

  BNSC           British National Space Centre

  BOF            Beginning Of File

  BOL            Beginning Of Life

  BONeS          Block Oriented Network Simulator

  BOP            Big Optical Pipe

  BOREAS         Boreal Ecosystem-Atmospheric Study

  BOT            Beginning Of Tape

  BPDU           Bitstream Protocol Cata Unit

  BPF            Band Pass Filter

  bpi            Bits Per Inch

  BPR            Office Of Biological And Physical Research

  bps            Bits Per Second

  Bps            Bytes Per Second

  BPSK           Binary Phase Shift Key

  BRDF           Bi-Directional Reflective Distribution Function

  BRDF           Bi-Reflectance Distribution Function

  BRF            Bi-Directional Reflectance Factor

  BSRN           Baseline Surface Radiation Network

  BST            Ball Star Tracker

  BTS            Brightness Temperature At Sensor

  BTT            Bus Traffice Table

  BTU            British Thermal Unit

  BUFR           Binary Universal Format For Representation \[Of Data\]

  BUS            Broadcast And Unknown Server

  BUV            Backscatter Ultraviolet

  BYTE           Binary Element String

  C              A Program Language

  C              Centigrade

  C              Celsius

  C              Commands

  C&D            Command and Data

  C&DH           Command And Data Handling

  C&DHS          Command And Data Sandling Subsystem

  C&DM           Configuration And Data Management

  C&T            Command And Telemetry

  C&TC           Command And Telemetry Controller

  C&TH           Command and Telemetry Handbook

  C-STAR         Conically Scanning Two-Look Airborne Radiometer

  C/C            Command And Control

  C/N0           Carrier Power To Noise Power Aspectral Density Ratio

  C/No           Carrier-To-Noise Density Ratio

  C/O            Checkout

  C/O            Carry Out files

  C/S            (EOS) Common Spacecraft

  C1             EDOS Release Configuration 1 Used For Terra (AM-1)
                 Operations

  C3             Communications, Command And Control

  CA             California

  CAC            Climate Analysis Center (NOAA/Mnc)

  CAD            Command Allocation Document

  CAD            Computer Aided Design

  CAD/CAE        Computer Aided Design/Computer Aided Engineering

  CAD/CAM        Computer Aided Design/Computer Aided Manufacturing

  CADH           Command And Data Handling

  CADM           CERES Angular Directional Model

  CADU           Channel Access Data Unit

  CAGEX          CERES/ARM/GEWEX Experiment

  CAI            Computer-Aided Instruction

  CAL            Calibrate

  CAL WG         Calibration Working Group

  CAL/VAL        Calibration/Validation

  CALIPSO        Cloud-Aerosol Lidar and Infrared Pathfinder Satellite
                 Observation (CALIPSO)

  CALM           Circumpolar Active Layer Monitoring

  CALS           Cloud And Aerosol Lidar System

  CALS           Computer-Aided Acquisition And Logistics Support

  CAM            Computer-Aided Manufacturing

  CAMEX          Convection And Moisture Experiments

  CAMS           Climate Analysis And Monitoring System

  CaPE           Convective Precipitation And Electrification Experiment

  CARIACO        Carbon Retention In A Colored Ocean

  CARS           Climate Analysis and Research Service

  CART           Cloud And Radiation Testbed

  CASE           Computer Aided Software Engineering

  CAT            Catalytic (PS)

  CATV           Cable Television

  CAVE           CERES Arm Validation Experiment

  CBM            Command Block Memory

  CBP            Code Block Processor

  CBR            Constant Bit Rate

  CBT            Computer Based Training

  CC             Control Center

  CC             Configuration Code

  CC             Command Controller

  CCA            Cloud Cover Assessment

  CCAFS          Cape Canaveral Air Force Station

  CCAR           Colorado Center for Astrodynamics Research (University
                 of Colorado)

  CCB            Configuration Change Board

  CCB            Change Control Board

  CCB            Configuration Control Board

  CCD            Charge Coupled Device

  CCDI           Clearcase DDTS Integration

  CCDS           Communications And Data Distribution System

  CCE            Charge Composition Explorer

  CCI            Common Carrier Interface

  CCL            Closed Circuit Line

  CCM            Community Climate Model

  CCN            Clound Condensation Nuclei

  CCOSM          Chemistry And Circulation Occultation Spectroscopy
                 Mission

  CCR            Configuration Change Request

  CCR            Configuration Control Request

  CCR            Computer Communications Room

  CCRS           Canada Center For Remote Sensing

  CCS            Climate Calibration Service

  CCS            Communications And Control Segment (NCC)

  CCS            Communications Subsystem

  CCS            Constellation Coordination System

  CCSD           Computer Compatible Signal Data

  CCSDS          Consultative Committee For Space Data Systems

  CCSDS          Consultative Committee for Space Data System

  CCT            Computer-Compatible Tape

  CD             Compact Disk (Optical Disk)

  CD-R           Compact Disk-Recordable

  CD-ROM         Compact Disk - Read Only Memory

  CD-RW          Compact Disk - Rewritable

  CDA            Command And Data Acquisition

  CDA            Critical Design Audit

  CDAS           Command And Data Acquisition Stations

  CDAU           Channel Acces Data Unit

  CDB            Collection Data Base

  CDB            Command Data Block

  CDCR           Conceptual Design And Cost Review

  CDDIS          Crustal Dynamics Data Information System

  CDE            Common Desktop Environment

  CDE            Common Data Environment

  CDE            Cooler Drive Electronics

  CDF            Common Data Format

  CDF            Channel Definition Format (Microsoft's Push Technology
                 Based On XML)

  CDFG           California Department Of Fish And Game

  CDH            Command And Data Handling

  CDHF           Central Data Handling Facility

  CDIAC          Carbon Dioxide Information and Analysis Center (Also
                 known as DOE/CDIAC)

  CDIC           Carbon Dioxide Information Center (DOE)

  CDIS           Command and Data Interface Simulator Unit

  CDM&CS         Climate Data Management and Calibration Services

  CDMS           Climate Data Management Service

  CDMS           Cryospheric Data Management System (NSIDC)

  CDMTS          Configuration/Data Management Tracking System (ECS)

  CDO            Central Documentation Offfice

  CDOC           Colored Dissolved Organic Carbon

  CDOM           Colored Dissolved Organic Matter

  CDOS           Customer Data And Operations System

  CDPs           Climate Data Products

  CDR            Critical Design Review

  CDRC           CIESIN Data And Research Center

  CDRD           Contract Data Requirements Document

  CDRL           Contract Data Requirements List

  CDRL           Control Data Requirement List

  CDROM          Crustal Dynamics Data Information System

  CDROM          Compact Disc Read Only Memory

  CDRs           Climate Data Records

  CDS            Cell Directory Service

  CDS            Comprehensive Discrepancy System

  CDS            CCSDS Day Segmented Time Code

  CDS            Consolidated Discrepancy reporting System

  CDSA           Common Data Security Architecture

  CDSCP          Cell Directory Service Command Program

  CDSF           Customer Data Service Facility

  CDT            Cell Delay Tolerance

  CDT            Constraint Definer Tool

  CDU            Customer Data Unit

  CDU            Command Decoder Unit

  CDV            Cell Delay Variation

  CDW            Critical Design Walk-Through

  CDWG           Client Design Working Group

  CE             Conducted Emissions

  CE             Clean Exposure

  CE             Command Enable

  CE             Critical Event

  CEA            CERES Aft

  CEAREX         Coordinated Eastern Artic Experiment

  CEC            Commission Of European Committees

  CECIL          C-Extended Command Interface Language

  CED            Components Engineering Department

  CED            Command Encryptor/Decryptor

  CEES           Committee On Earth And Environmental Sciences

  CEF            CERES Fore

  CEG            Chief Enginering Group (Release B)

  CEI            Contract End Item

  CEIS           Contract End Item Specification

  CEM            Cumulus Ensemble Model

  CEMSCS         Central Envrionmental Monitoring Satellite Computer
                 System (NOAA)

  CEMSDS         Central Environmental Satellite Data System

  CENR           Committee On The Environment And Natural Resources
                 Research

  CEO            Centre For Earth Observation (ESA)

  CEO            Center For Earth Observations European Union

  CEO-ES         CEO - Enabling Services

  CEOS           Committee on Earth Observations Satellites

  CEOSR          Center For Earth Observing And Space Research

  CEOSWGD/CS     CEOS Working Group On Data, Catalog Subgroup

  CEQ            Council On Environmental Quality

  CEQA           California Environmental Quality Act

  CER            Cell Error Rate

  CERCLA         Comprehensive Environmental Response Compensation
                 Liability Act

  CERES          Clouds And Earth\'s Radiant Energy System

  CERL           Construction Engineering Research Laboratory

  CERN           European Laboratory For Particle Physics

  CERT           Computer Emergency Response Team

  CERT           Certification

  CES            Committee On Earth Sciences

  CES            Conical Earth Sensor

  CES            Control Electronics Section

  CESA           California Endangered Species Act

  CESA           Conical-Scanning Earth Sensor Electronics

  CESA           Conical Earth Sensor Assembly

  CESAR          Cloud Electrification Studies Using Aircraft And Radar

  CESBIO         Centre d'Études Spatiales De La Biosphère

  CESDIS         Center For Excellence In Space Data And Information
                 Sciences (GSFC)

  CESDS          Central Environmental Satellite Data System (NOAA)

  CESE           Conical-Scanning Earth Sensor Electronics

  CETF           Critical Evaluation Task Force

  CEV            Command Execution Verification

  CF             Customer Facility

  CFC            Chloroflurocarbon

  CFE            Customer Furnished Equipment

  CFG CTRL       Configuration Control

  CFIS           Conflict-Free Instrument Schedule

  CFM            Cubic Feet Per Minute

  CFPA           Cold Focal Plane Assembly

  CFR            Code Of Federal Regulations

  CFS            Conflict Free Schedule

  CG             Center Of Gravity

  CGC            Committee On Global Change (NRC)

  CGCC           Current Ground Command Count

  CGCP           Canadian Global Change Program

  CGCR           Committee On Global Change Research

  CGED           Committee On Geophysical And Environmental Data (NRC)

  CGI            Common Gateway Interface

  CGM            Computer Graphics Metafile

  CGS            Commercial Ground Station

  CH             Cable Harness

  CHAMP          Challenging Mini-Satellite Payload

  CHAMP          Comet Haley Active Monitoring System

  CHAPS          Chemistry Annual Meeting For Project Support

  CHAPS          Chem-1 Annual Planning And Steering

  CHCI           Communications Hardware Configuration Item

  CHEM           Chemistry Mission

  CHEM-1         Chemistry Mission - 1

  CHGE           Center For Health And The Global Environment

  CHI            Computer Human Interface

  CHI            Computer-Human Interface

  CHID           Channel Identification

  CHRIS          Crustaceous Heinous Ridiculous Insane Serpent

  CHRP           Configurable High-Rate Processor

  CHRPS          Configurable High-Rate System

  CHUI           Character User Interface

  CI             Configuration Item

  CI             Command Interpreter

  CIAL           Cinfiguration Item Assembly List

  CIC            Command Interrupt Code

  CICP           Critical Item Control Plan

  CICS           Customer Information Control System (IBM)

  CIDL           Configuration Item Data List

  CIDM           Client, Interoperability And Data Management

  CIDM           Cls/Ios/Dms

  CIDR           Classless Interdomain Routing

  CIESIN         Consortium For International Earth Science Information
                 Network

  CIF            Communications Interface Function

  CIG            Customer Interface Group

  CII            Chemistry International Instrument

  CIIL           Configuration Item Identification List

  CIIN           Configuration Item Identification Number

  CIL            Common Interface Language

  CIL            Critical Items List

  CIM            Common Information Model

  CIMSS          Cooperative Institute For Meteorological Satellite
                 Studies

  CIN            Center Information Network

  CINTEX         Catalogue Interoperability Experiment

  CINTEX         CEOS Catalogue Interoperability Experiment

  CINTOPS        Catalogue Interoperability Operations

  CIO            Contents Identifier Object

  CIO            Chief Information Officer

  CIP            Catalogue Interoperability Protocol

  CIP-AD         Cip Release A Demonstration

  CIR            Committed Information Rate

  CIRES          Cooperative Institute For Research In Environmental
                 Sciences (Univ Of Colorado)

  CIRS           Composition Infrared Spectrometer

  CIS            Cryogenic Interferometer Spectrometer

  CIS            Configuration Item Specification

  CISP           Commercial Internet Service Provider

  CIT            California Institute Of Technology

  CITE           Cargo Integration Test Equipment

  CITE           Chemical Instruments Test Experiment

  CITF           CDOS Integration And Test Facility

  CIU            Controls Interface Unit

  CIWG           Catalog Interoperability Working Group

  CIWG           Canadian Ice Working Group

  CKD            Clough, Kneizys, And Davies

  CLAES          Cryogenic Limb Array Etalon Spectrometer

  CLAM           Cooler Located Analog Electronics Module

  CLAM           Chesapeake Lighthouse And Aircraft Measurements For
                 Satellites

  CLAS           Center for Lower Atmospheric Studies (University of
                 Colorado)

  CLASS          Communications Link Analysis Simulation System

  CLAVR          Clouds From AVHRR

  CLCW           Command Link Control Word

  CLHP           Component Loop Heat Pipe

  CLI            Command Line Interface

  CLIVAR         Climate Variability (And Predictability International
                 Program \[WCRP\])

  CLIVAR         Climate Variability Research Program (Uses ADEOS Data)

  CLP            Cell Loss Priority

  CLR            Cell Loss Ratio

  CLS            Client Subsystem

  CLTU           Command Link Transmission Unit

  CLTU           Command Link Transfer Unit

  cm             Centimeter

  CM             Configuration Management

  CM             Command Management

  CM             Center Of Mass

  CMA            Cm Administrator

  CMAS           Configuration Management Application Service

  CMB            Configuration Management Board

  CMD            Command

  CMD            Command Subsystem

  CMD            CHIPs Mission Director

  CMD/TLM        Command/Telemetry

  CMDL           Climate Monitoring And Diagnostics Laboratory

  Cmds           Commands

  CME            Calibration Mechanism

  cmi            Continuous Measurable Improvement

  CMI            Crptographic Management Interface

  CMI            Configuration Management Instruction

  CMIP           Common Management Information Protocol

  CMIS           Common Management Information Services

  CMM            Configuration Management Manual

  CMO            Configuration Management Office

  CMOS           Common Metal Oxide Semiconductor

  CMP            Configuration Management Plan

  CMP            Computer Model Package

  CMP            Corrective Maintenance Performed

  CMR            Cell Mis-Insertion Rate

  CMS            Climate Mission Storage

  CMS            Command Management System

  CMS            Common Management Service

  CMS            Command Management Service

  CMS            Customer Management System

  CMS            Code Management System

  CMS            Configuration Management System

  CMS            Command Management Subsystem

  CMSE           Configuration Management Systems Engineer

  CMSL           Configuration Management Software Librarian

  CMT            Collection Management Tools

  CMTS           Control And Monitor Test Set

  CMU            Contamination Monitoring Unit

  CMU            Cooler Mechanical Unit

  CN             Change Notice

  CNE            Campus Network Environment

  CNE            Center Network Environment

  CNELs          Community Noise Equivalent Levels

  CNES           Centre National D\'etudes Spatiales (France)

  CNPS           California Native Plant Society

  CNR            Consiglio Nazionale Delle Ricerche (Italy)

  CNR            Ccarrier To Noise Ratio

  CNRS           Centre National De La Recherche Scientifique

  CO             Contracting Officer

  CO             Carbon Monoxide

  CO             Colorado

  Co-I           Co-Investigator

  CO1            Change Order 1

  COADS          Comprehensive Ocean-Atmosphere Data Set

  COARDS         Cooperative Ocean/Atmosphere Research Data Service

  COARE          \[Toga\] Coupled Ocean-Atmosphere Response Experiment

  COB            Close Of Business

  COBE           Cosmic Background Explorer

  CODA           Customer Operations Data Accounting

  CODA           Customer Operational Data Accounting Service

  CODD           Change Order Definition Date

  CODEC          Compression/Decompression

  CODMAC         Committee On Data Management, Archiving, And Computing

  CODMAC         Committee On Data Management And Computation

  COE            Contingency Operations Exercise

  COE            Contingency Exercise

  COF            Construction Of Facilities

  COF            Component Origination Form

  COFUR          Cost Of Filling A User Request

  COHMEX         Cooperative Huntsville Meteorological Experiment

  COLA           Center For Ocean-Land-Atmosphere (IGES)

  COLD           Computer Output To Laser Disk

  COLOR          Ocean Color Flight - Seawifs

  COM            Communications

  COM            Common Object Model (Language-Independent Architecture
                 From Microsoft)

  COM            Contamination Monitor (TEDA)

  COM-S          Contamination Monitor Sensor (TEDA)

  CoMITS         Configuration Management Information Tracking System

  COMM           Communication Subsystem

  COMMGR         Communications Manager

  ComMgr         Communications Manager

  COMMS          Communication Subsystem (Generic Interface)

  COMS           Communications Subsystem

  COMS           Cdos Operations Management Service

  COMSEC         Communications Security

  CON            Contract

  CONS           Connection Oriented Network Service

  CONT           Contracts

  CONT           Contacts

  CONTR          Contract

  CONUS          Continental United States

  COOP           Continuity Of Operations Plan

  COP            Command Operation Procedure

  COP            Co-Orbiting Platform

  COP            Calibrated Output Processing

  COP-1          Command Operations Protocol-1

  CORBA          Common Object Request Broker Architecture

  COS            Class Of Service

  COS            Cosmic Origins Spectrograph (HST)

  COS            Carbonyl Sulfide

  COS            Constellation Operations System

  COSE           Common Operating System Environment

  COSEPUP        Committee On Science, Engineering, And Public Policy

  COSMIC         Computer Software Management And Information Center
                 (NASA)

  COSPAR         Congress For Space Research

  COSS           Common Object Services Specifications

  COSTR          Collaborative Solar Terrestrial Research

  COT            Customer Operations Team

  COTR           Contracting Officer's Technical Representative

  COTS           Commercial Off-The-Shelf (Hardware Or Software)

  COTS           Commercial Off-The Shelf

  cov            Covariance

  COV            Coefficient Of Variation

  COVE           CERES Ocean Validation Experiment

  CP             Cold Plate

  CP             Conference Publication

  CP             Command Processor

  CP             Telemetry And Control Processor

  CP             Call For Proposals

  CP             Cost Plus

  CP-PDU         Ccsds Path Protocol Data Unit

  CP-PDU         Central Processing-Protocol Data Unit

  CPAF           Cost Plus Award Fee

  CPAN           Comprehensive Perl Archive Network

  CPC            Computer Program Components

  CPCGN          Canadian Permanent Committee On Geographical Names

  CPCI           Computer Program Configuration Item

  CPEP           Climate, People And Environment Program

  CPF            Calibration Parameters File

  CPFF           Cost Plus Fixed Fee

  CPG            Consumer Packaged Goods

  CPHTS          Capillary-Pumped Heat Transport System

  CPI            Cost Performance Index

  CPIO           Copy Files In From And Out To An Archive

  CPL            Computer Program Library

  CPM            Critical Path Method

  CPN            CCSDS Principal Network

  CPP            Cloud Photopolarimeter

  CPR            Cost Performance Report

  CPR            Cloud Profiling Radar

  CPS            Contractor Purchasing System

  CPSR           Contractor Purchasing System Review

  CPT            Comprehensive Performance Test

  CPTEC          Center For Weather And Climate Prediction (Brazil)

  CPU            Central Processing Unit

  CPV            Continuous Pressure Vessel

  CR             Change Report

  CR             Contractor Report

  CR             Correlation Radiometer

  CR             Correlation Radiometry

  CR             Classroom Presentation

  CR             Cost Reimbursable

  CR             Change Request

  CRA            Central Radiator Assembly

  CRC            Cyclic Redundancy Code

  CRC            Climate Research Committee (NRC)

  CRC            Cyclic Redundancy Checksum

  CRF            Change Report Form

  CrIS           Cross-Track Infrared Sounder

  CRIS           Cross-Tracked Infrared Sounder

  CRISTA         Cryogenic Infrared Spectrometers And Telescopes For The
                 Atmosphere

  CRISTA/SPAS    Cryogenic Infrared Spectrometers And Telescopes For The
                 Atmosphere/ Shuttle Pallet Satellite

  CRL            Communication Research Lab (Japan)

  CRM            Change Request Manager

  CRM            Computer Resource Manager

  CRP            Command Relay Processor

  CRP            Configuration Requirements Processing

  CRP            Command Return Processor (ERPS component)

  CRR            Capabilities And Requirements Review

  CRS            Cloud Radiative Swath

  CRSP           Commercial Remote Sensing Program

  CRT            Cathode Ray Tube

  CRU            Computer Resource Unit

  CRYSYS         Cryospheric System (Monitors Global Change In Canada
                 (EOS IDS))

  CS             Client Server (Use Client-Server For EDHS Search)

  CS             Communications Subsystem

  CS             Common Services

  CS             Computer Software

  CS             Convergence Sublayer

  CS             Common Spacecraft

  CSA            Canadian Space Agency

  CSA            Configuration Status Accounting

  CSA            Cellestal Sensor Assembly

  CSAFS          Central Standard Autonomous File System

  CSAR           Configuration Status Accounting Report

  CSAT           Center For Space And Advanced Technology

  CSAT           Computer Security Awareness Training

  CSC            Computer Software Component

  CSC            Coordinate System Conversion

  CSC            Computer Sciences Corporation

  CSCI           Computer Software Configuration Item

  CSD            Command Safety Destruct

  CSDT           Computer Science Data Types

  CSES           Center For The Study Of Earth From Space (Univ Of CO)

  CSF            Comprehensive Science Forms

  CSF            Control And Simulation Facility

  CSF            Chemistry And Special Flights

  CSI            Configuration Sub Item

  CSI            Contractor Source Inspector

  CSI            (Institute For) Computational Sciences And Informatics

  CSIRO          Commonwealth Scientific And Industrial Research
                 Organization (Australia)

  CSL            Configuration Status List

  CSLC           California Space Launch Complex

  CSM            Computer Status Monitor

  CSM            Command Storage Memory

  CSM            Cold Sky Mirror (AMSR-E)

  CSMA/CD        Carrier-Sense Multiple-Access With Collision Detection

  CSMS           Communications And Systems Management Segment

  CSO            Computer Security Officer

  CSOC           Consolidated Space Operations Center

  CSOC           Combined Satellite Operations Contract

  CSOC           Consolidated Space Operations Contract

  CSP            Common Signal Processor

  CSP            Commerce Service Provider

  CSR            Consent To Ship Review

  CSR            Center for Space Research (University of Texas)

  CSR            Customer Service Request

  CSS            Communications Subsystem

  CSS            Client Server Subsystem

  CSS            Coarse Sun Sensor

  CSS            Cascading Style Sheets (W3C, HTML 4.0)

  CSS            Communications And Infrastructure Subsystem

  CSS-P          CSS Positioning

  CSS1           CSS Level 1 (W3C)

  CSS2           CSS Level 2 (W3C)

  CSSA           Coarse Sun Sensor Assembly

  CSSE           Cdos Software Support Environment

  CSSR           Contract Summary Status Report

  CSSR           Contract Schedule Status Report

  CST            Carrier Star Tracker

  CST            Comment/Survey Tool

  CSTI           Civilian Space Technology Initiative

  CSTOL          Customer System Test And Operations Language

  CSTOL          Colorado System Test Operations Language

  CSTOL          Colorado System Test and Operations Language

  CSU            Computer Software Unit

  CSU            Command Language (OASIS)

  CSU            Colorado State University

  CSWP           Common Software Process

  CT             Combined Test

  CT             Clear Text

  CTA            Computer Technology Assessment

  CTAV           CDOS Test And Verification

  CTB            Central Thermal Bus

  CTBA           Command and Telemetry Buffer Assembly

  CTC            Contract Target Cost

  CTC            Cost To Complete

  CTC            Command And Telemetry Controller

  CTC            Command & Telemetry Controller/Communication And
                 Tracking Console

  CTC            Center For Technology Commercialization

  CTCU           Central Telemetry Control Unit

  CTD            Cost To Date

  CTD            Cell Transfer Delay

  CTE            Coefficient Of Thermal Expansion

  CTF            Critical Transfer Frames

  CTFS           Common Time Frequency System

  CTI            Command And Telemetry Interface

  CTI            Computer Telephony Integration

  CTIB           Command and Telemetry Interface Board

  CTIU           Command And Telemetry Interface Unit

  CTL            Compatibility Test Laboratory

  CtLib          Call To Library

  CTM            Communications Test Message

  CTM            Chemistry And Transport Model

  CTN            Collection Technical Note

  CTO            Commercial Technology Office

  CTP            Confidence Test Program

  CTP            Confidence Test Package

  CTP-EFC        Confidence Test Program Electronic File Cabinet

  CTQ            Command Tag Queuing

  CTU            Command and Telemetry Unit

  CTV            Compatibility Test Van

  CTV            Cell Transfer Variation

  CU             University Of Colorado

  CU             Control Unit

  CUB            Cuiba, Brazil Station Id

  CUC            Constant And Unit Conversions

  CUC            CCSDS Unsegmented Time Code

  CUP            Contract Understanding Period

  CUT            Code And Unit Test

  CUT            COTS Upgrade Team

  CVCDU          Coded Virtual Channel Data Unit

  CVCDU-ID       Cvcdu Identifier

  CVCM           Collected Volatile Condensable Mass

  CVP            Content Vectoring Protocol

  CVS            Concurrent Version System

  CVT            Current Value Table

  CW             Continuous Wave

  CW             Control Window

  CW             Carrier Wave

  CWBS           Contract Work Breakdown Structure

  CY             Calendar Year

  CZCS           Nimbus-7 Coastal Zone Color Scanner

  D&F            Determination And Finding

  D&P            Definitive And Predictive

  D/L            Downlink

  D3             High Performance Tape Cartridge System Used In DSS STMGT

  DAA            Data Availability Acknowledgment

  DAA            Document Availability Authorization

  DAAC           Distributed Active Archive Center

  DADS           Data Archive And Distribution System

  DAF            Data Archive Facility

  DAF            Data Archival Function

  DAF            Data Archive Facility (EDOS Component)

  DAMUS          Data Management And User Services

  DAN            Data Availability Notice

  DAO            Data Assimilation Office (NASA/GSFC)

  DAO            Data Assimilation Office

  DAP            Directory Access Protocol

  DAP            Delivered Algorithm Package

  DAR            Data Acquisition Request

  DART           Data Acquisition Request Tool

  DAS            Data Assimilation System (At DAO)

  DAS            Detailed Activity Schedule

  DAS            Direct Access Service

  DAS            Direct Access System

  DAS            Data Availability Schedule

  DAS            Data Assimilation System

  DAS            Detail Activity Schedule

  DASCE          Data Assimilation System Computing Environment

  DASD           Direct Access Storage Device

  DAT            Digital Audio Tape

  DB             Database

  DB             Data Block

  DB             Direct Broadcast (Terra AM-1)

  DBA            Database Administrator

  DBCS           Double-Byte Character Set

  DBE            Data Block Emulator

  DBMS           Database Management System

  DBS            Direct Broadcast System

  DBS            Database

  DCE            Distributed Computing Environment (OSF)

  DCE            Data Communications Equipment

  DCE            Distributed Communication Environment

  DCF            Data Capture Facility

  DCHCI          Distributed Communications Hardware Configuration Item

  DCI            Data Communications Interface

  DCL            Data Control Language

  DCN            Document Change Notice

  DCOM           Distributed Component Object Model

  DCPS           Deployment Cable Position Switch

  DCR            Database Change Request

  DCW            Digital Chart Of The World

  DD             Direct Downlink

  DD             Data Dictionary

  DDA            Deployment Drive Assembly

  DDF            Data Distribution Facility (PACOR)

  DDI            Diffuse Downwelling Irradiance

  DDICT          Data Dictionary

  DDICT          Data Dictionary CSCI

  DDIST          Data Distribution

  DDIST          Data Distribution CSCI

  DDL            Data Definition Language

  DDL            Data Description Language

  DDL            Direct Downlink (Terra AM-1)

  DDM            Deployment Drive Motor

  DDMT           Data Dictionary Maintenance Tool

  DDN            Data Delivery Notice

  DDR            Detailed Design Review

  DDS            Direct Downlink System

  DDSHW          Document Data Server HWCI

  DDSIT          Data Distribution Service CSCI

  DDSRCHW        Document Data Server CSCI

  DDSRV          Document Data Server

  DDSRV          Document Data Server CSCI

  DDT            Data Dictionary Tool

  DDW            Detailed Design Walkthrough

  DE             Dynamics Explorer

  DE             Director of Engineering

  DEBITS         Deposition Of Biogeochemically Important Trace Species

  DECOM          \[FOS\] Decommutation Process

  DEDS           DAAC To EDOS Data Set

  DEF            Data Exchange Format

  DEL            Data Evaluation Laboratory (GSFC)

  DEM            Digital Elevation Model

  DEM            Digital Elevation Map

  DEMO           Demonstration

  demux          Demultiplexer

  DES            Deployable Earth Shade (AIRS)

  DES            Data Encryption Standard

  DESKT          Desktop \[Configuration Item\]

  DESKT          Desktop CSCI

  DEV            Development

  DF             Data Flow

  DFA            Dual Frequency Altimeter

  DFA            Dual-Frequency Radar Altimeter

  DFCD           Data Format Control Document

  DFD            Data Flow Diagram

  DFMH           Dispersed Free Molecualr Heating

  DG1            Data Group 1 (TDRSS)

  DG2            Data Group 2 (TDRSS)

  DGVM           Dynamic Global Vegetation Models

  DHC            Data Handling Center

  DHCP           Dynamic Host Configuration Protocol

  DHF            Data Handling Facility

  DIAL           Differential Absorption Lidar

  DID            Data Item Description

  DIF            Data Interface Facility

  DIF            Directory Interchange Format

  DIM            Distributed Information Manager

  DIMGR          Distributed Information Manager CSCI

  DIPHW          Distribution And Ingest Peripheral Management HWCI

  DIR            Direct

  DIS            Data Information System

  DITL           Day-in-the-Life

  DLG            Digital Line Graph

  DLL            Dynamic Link Library

  DLPO           Dod Landsat Program Office

  DLS            Dynamic Limb Sounder

  DLT            Digital Linear Tape

  DM             Data Management

  DMF            Decommutated Mnemonics File

  DMGHW          Data Management Hardware \[Configuration Item\]

  DML            Data Manipulation Language

  DMO            Data Management Office

  DMR            Detailed Mission Requirements

  DMS            Data Management System

  DMSP           Defense Meteorological Satellite Program

  DMWG           Data Migration Working Group

  DN             Delivery Notice

  DNS            Domain Name Services

  DNSI           Direct Normal Solar Irradiance

  DOAS           Differential Optical Absorption Spectroscopy

  DOD            Digital Optical Data

  DOD            Digital Optical Disk

  DoD            Department Of Defense

  DOF            Distributed Object Framework

  DOF            Degrees Of Freedom

  DOF            Data Operations Facility

  Dom            Domestic

  DOPLID         Doppler Lidar

  DORIS          Doppler Orbitography And Radiopositioning Integrated By
                 Satellite

  DORRAN         Distributed Ordering, Reporting, Researching, And
                 Accounting Network (EDC)

  DOS            Disk Operating System

  DOTL           Day-of-the-Launch

  DOY            Day Of Year

  DP             Direct Playback (Terra AM-1)

  DPAF           Dual Payload Attach Fitting

  DPF            Data Processing Facility

  DPM            Deputy Project Manager

  DPM/R          Deputy Project Manager, Resources

  DPM/R          Deputy Project Manager/Resources

  DPR            Dual Precipitation Radar

  DPR            Data Processing Request

  DPREP          Data Pre-Processing CSCI

  DPREP          Data Pre-Processing

  DPRID          Data Processing Request Identifier

  DPS            Data Processing Subsystem

  DPS            Data Product Specification

  DR             Discrepancies Report

  DR             Data Request

  DR             Data Rate

  DR             Delivery Record

  DR             Discrepancy Report

  DR             Data Requirement

  DRB            Discrepancy Review Boards

  DRD            Data Requirements Document

  DRP            Data Reduction Platform

  DRPHW          Data Repository Hardware \[Configuration Item\]

  DRS            Direct Downlink Receiving Station

  DRTS           Data Relay And Tracking System (Japan)

  DRTT           Discrepancy Reporting And Tracking Tool

  DRTT           Discrepancy Reporting Tracking Tool

  DS             Data Server

  DSA            Data Subscription Acknowledgment

  DSA            Directory Service Agent

  DSCC           Deep Space Communications Complex (DSN)

  DSI            Data Server Interface

  DSMC           Data Services Management Center

  DSN            Deep Space Network

  DSNO           Distributed Network Systems Office

  DSP            Directory Service Protocol

  DSR            Data Subscription Request

  DSS            Data Server Subsystem

  DSS            Data Subsystem

  DSS            Dynamic Spacecraft Simulator

  DSU            Data Storage Unit

  DSWG           Data Science Working Group

  DTED           Digital Terrain Evaluation Data

  DTG            Date Time Group

  DTM            Digital Terrain Model

  DTM            Dual Thruster Module

  DTO            Detailed Test Objective

  DTS            Digital Test Subsystem

  DTU            Digital Telemetry Unit

  DUE            DAAC Unique Extension

  DV             Data Visualization

  DV             Delta Velocity

  DVD            Digital Video Disk

  DWL            Dopplar Wind Lidar

  DWS            Doppler Wind Sensor

  E&S            Earth And Sky

  E-ISAT         EOSDIS Internet Security Assessment Team

  E-LIDAR        Experimental Lidar

  E-mail         Electronic Mail

  E-R            Entity-Relationship

  EA             Electronics Assembly

  EAGE           Electrical Aerospace Ground Equipment

  EAI            Enterprise Application Integration

  EAP            EOS Advisory Panel

  EAP            EDOS Activity Plan

  EAR            Export Administration Regulations

  Early AM-1     EOS Morning Crossing (Descending) Mission

  EAS            Electrical Accommodation Subystem (Terra AM-1)

  EAS            ECS Advertising Service

  EASE           Equal Area SSM/I Earth

  EASE           Equal-Area Scalable Earth

  EASE           Equal-Area Scalable Earth-Grid

  EASE-Grid      Equal Area SSM/I Earth Grid

  EASOE          European Arctic Stratospheric Ozone Experiment

  EBC            Eastern Boundary Currents

  EBCDIC         Extended Binary-Coded Decimal Interchange Code

  EBnet          EOSDIS Backbone Network (Combines ECOM And ESN)

  EBnet          Ethernet Backbone Network

  EBnet          EOSDIS Backbone network

  EBS            EOS Broadcast Stations

  EC             Error Correction

  ECC            Error Correction Code

  ECC            Elliptic Curve Crptography

  ECD            Expected Completion Date

  ECEF           Earth Centered Earth Fixed

  ECHIVAL        European International Project On Climate And
                 Hydrological Interactions Between Vegetation,
                 Atmosphere, And Land Surfaces

  ECHO           EOS Clearing House

  ECI            Earth Centered Inertial

  ECL            EOS Control Language

  ECL            ECS Command Language

  ECL            Emitter Coupled Logic

  ECLIPS         Experimental Cloud Lidar Pilot Study

  ECMA           European Computer Manufacturers Association

  ECMAScript     Scripting Specifications By W3C

  ECMP           ECS Configuration Management Plan

  ECMWF          European Centre For Medium Range Weather Forecasts (UK)

  ECMWF          European Center For Medium Range Weather Forecasts (UK)

  ECN            Engineering Change Notice

  ECOM           EOS Communications (Replaced By Ebnet)

  ECOM           EOSDIS Communications System

  ECR            Earth Centered Rotating

  ECRB           EOS Configuration Review Board

  ECRB           Emos Configuration Review Board

  ECRS           ESDIS Consolidated Requirements System

  ECS            EOSDIS Core System

  ECSO           Executive Committee For Science Outreach

  ECSS           EOS Common Spacecraft Specification

  ECSTVP         ECS Test And Verification Procedures

  ECSVDB         ECS Verification Database

  ECT            EOS Compatibility Test

  EDAC           Error Detection And Correction

  EDC            EROS Data Center (DAAC) (USGS)

  EDC            EROS Data Center

  EDF            ECS Development Facility

  EDF            Engineering Data Formatter

  EDG            EOS Data Gateway (V0 Client -- Replacement Of B0SOT)

  EDG            EOS Data Gateway

  EDGRS          Earth Data Gathering and Reporting System

  EDHS           ECS Data Handling System

  EDI            Electronic Data Interface

  EDI            Electronic Data Interchange

  EDIO           External Development & Interface Office

  EDIO           External Development and Interface Office

  EDMA           ESDIS Data Model Analysis

  EDMP           ECS Data Management Plan

  EDN            Expedited Data Set Notification

  EDOCS          EOS Data Operations And Communications System

  EDOS           EOS Data and Operations System

  EDP            Embedded Data Processor

  EDR            Expedited Data Set Request

  EDRI           Engineering Data Ready Indicator

  EDRs           Environmental Data Records

  EDRS           European Data Relay Satellite

  EDS            Earth Data System (NIIT)

  EDS            Expedited Data Set

  EDS            EDOS Data Set

  EDTS           End-to-end Data Tracking System

  EDU            EDOS Data Unit

  EEA            European Environment Agency

  EECF           Earthnet Ers-1 Central Facility

  EEDSOG         End-To-End Data Systems Operations Group

  EEID           EOSDIS External Interface Document

  EEMOC          European EOS Mission Operations Center

  EEPROM         Electrically Erasable Programmable Read Only Memory

  EEPROM         Electrically Erasable Programmable Readable Only Memory

  EET            End-To-End Test

  EETS           EOS Electronic Transfer System

  EFC            Electronic File Cabinet

  EFEDA          ECHIVAL Field Experiment In Desertification-Threatened
                 Areas

  EFM            EOS (Terra AM-1) Flight Software Maintenance

  EGCM           Eddy-Resolving General Circulation Model

  EGIG           Expédition Glaciologique International Au Groenland

  EGP            Exterior Gateway Protocol

  EGS            EOS Ground System

  EGS            EOS Ground Station

  EGSE           Electrical Ground Support Equipment

  EGT            EOSDIS Ground Terminal

  EGTS           EOS Ground Test System

  EICC           European Instrument Control Center

  EIDE           Enhanced IDE

  EIF            Entry Interface Facility

  EIGRP          Enhanced Interior Gateway Routing Protocol

  EIN            Equipment Identification Number

  EIN            ECS Identification Number

  EIP            Experiment Implementation Plan

  EIRP           Equivalent Isotropically Radiated Power

  EIRP           Effective Isotropic Radiated Power

  EIRR           External Independent Readiness Review

  EISA           Extended Industry Standard Architecture

  EISA           Enhanced Industry Standard Architecture

  EIT            EOSDIS Integration Team

  EITC           EGS Interface Test Capability

  EITP           Earth Science Information Technology Program

  EITSO          ESDIS Information Technology Security Official

  EJB            Enterprise Javabean (Server Component Model For Java
                 From Sun)

  El             Elevation

  ELA            Event Logging Api

  ELAN           Emulated Local Area Network

  ELANOR         Earth Limb And Nadir Operational Retrieval

  ELAS           Earth (Resources) Lab Applications Software

  ELF            Extremely Low Frequency

  ELS            Emergency Load Shed

  ELU            Electronics Unit

  ELV            Expendable Launch Vehicle

  EM             Engineering Model

  EM             Equipment Module

  EMA            Enterprise Management Architecture

  EMACC          EOS Multiple Applications Control Center

  EMAP           Environmental Monitoring And Assessment Program

  EMASS          E-Systems Modular Automated Storage Systems

  EMC            Electromagnetic Compatibility

  EMC            Electromagnetic Charge

  EMC            Emergency Mode Controller

  EMD            EOSDIS Core System Maintenance and Development

  EME            ECS Maintenance Environment

  EMF            Events Message File

  EMI            Electromagnetic Interference

  EMI            Electromagnetic-Radiation Interference

  EMIS           EDOS Management Information System

  EMISM          Electromagnetic Interference Safety Margin

  EMLS           EOS Microwave Limb Sounder

  EMOC           EOS Mission Operations Center

  EMOC           EOSDIS Mission Operations Center

  EMOS           EOS Mission Operations System

  EMOWG          EOS Mission Operations Working Group

  EMSn           EOS Mission Support Network

  EMU            Engineering Model Unit

  ENACEOS        Energetic Neutral Atom Camera For EOS

  ENCC           Emergency NCC

  ENSO           El Niño/Southern Oscillation

  ENVISAT        Environmental Satellite

  ENVISAT-1      First POEM Mission (ESA)

  EO             Earth Observation

  EO-1           Earth Orbiting

  EO-ICWG        Earth Observations International Coordination Working
                 Group

  EOC            EOS Operations Center

  EOC            Early Orbit Checkout

  EOC            End Of Contract

  EOC            Earth Observation Center (Japan)

  EOC            Essential Over-Current

  EOCAP          Earth Observation Commercial Applications Program

  EOCC           EOS Operations And Control Center

  EOD            Entering Orbital Day

  EODC           Earth Observation Data Centre (UK)

  EOF            End Of File

  EOIS           Earth Observation Information System

  EOL            End Of Life

  EOL            End Of Line

  EON            Entering Orbital Night

  EOP            EDOS Operation Protocol

  EOPM           Electro-Optic Phase Modulator

  EOPP           Earth Observation Preparatory Programme

  EOPS           ERBE Operational Processing System (LaRC)

  EOR            Engineering Operations Room

  EORC           Earth Observation Research Center (Tokyo, Japan)

  EOS            Earth Observing System

  EOS            Earth Observing Satellite

  EOS AERO       EOS Aerosol Mission

  EOS ALT        EOS Altimetry Mission

  EOS AM         Earth Observing System Observatory AM Or Morning
                 Crossing

  EOS CHEM       EOS Chemistry Mission

  EOS COLOR      EOS Color Mission

  EOS PM         Earth Observing System Observatory PM or Afternoon
                 Crossing

  EOS-G          Earth Observing System - Goddard

  EOSAT          Earth Observing Satellite Company

  EOSC           EOS Operations Support Capability

  EOSDIS         EOS Data and Information System

  EOSFDS         EOS Flight Data System

  EOSIWG         EOS Investigator Working Group

  EOSP           Earth Observing Scanning Polarimeter

  EOSPSO         EOS Project Science Office

  EOSSALT        Earth Observing Solid-State Radar Altimeter

  EOSSMS         EOS Space Measurement System

  EOSSRP         EOS Scientific Research Program

  EOT            End Of Track

  EOT            Engineering Operations Team

  EOT            EDOS Operational Timeline

  EOWG           ESDIS Operations Working Group

  EP             Evaluation Package

  EP             Explorer Platform

  EP             Earth Probe

  EP CSR         Evaluation Package Consent To Ship Review

  EPA            Environmental Protection Agency

  EPDS           EMOS Production Data Set

  EPDS           Earth Probe Data System

  EPDS           Electrical Power Distribution Subsystem

  EPG            ECS Process Improvement Group

  EPG            Engineering Process Group

  EPGN           EOS Polar Ground Network

  EPGS           EOS Polar Ground Station

  EPGSS          Earth Observing Polar Ground Station Services

  EPH            Ephemeris Data Access

  EPIC           Energitc Particles And Ion Composition

  EPIC           Earth Polychromatic Imaging Camera

  EPM            Earth Pointing Mode

  EPM            Earth Point Mode

  EPO            Education and Public Outreach

  EPO            Emergency Power Off

  EPOCH          Epoch -- A Time Reference Start Point

  EPOCH          Epoch 2000

  EPOCH          Real time test system used at NGST to interface with
                 spacecraft

  EPOP           European Polar-Orbiting Platform

  EPRR           Evaluation Package Readiness Review

  EPS            Encapsulated Postscript

  EPS            Electrical Power System

  EPS            Electrical Power Subsystem (Terra AM-1)

  EPV            Endpoint Vector

  eqpt           Equipment

  ER             Equipment Room

  ER-2           NASA Research Aircraft

  ERAST          Experimental Research Aircraft Sensor Technology Program

  ERB            Earth Radiation Budget

  ERB            Egs Review Board

  ERBE           Earth Radiation Budget Experiment

  ERBI           Earth Radiation Budget Instrument

  ERBS           Earth Radiation Budget Satellite

  ERCN           Educator Resource Center Network

  ERD            Entity Relationship Diagram

  ERDET          ESDIS Requirements Database Engineering Team

  ERG            EOSDIS Review Group

  ERIM           Environmental Research Institute Of Michigan

  ERIS           Emos Requirements Information System

  ERL            Environmental Research Laboratory

  ERMES          European Radio Messaging System

  ERO            Exact Repeat Orbit

  EROS           Earth Resources Observation System

  ERPS           EOS Real-Time Processing System

  ERS            Earth Resources Satellite

  ERS            European Remote-Sensing Satellite

  ERS-1          European Remote Sensing Satellite-1

  ERS-2          European Remote Sensing Satellite-2

  ERSDAC         Earth Remote Sensing Data Analysis Center, Japan
                 (Formerly

  ERTS           Earth Resource Technology Satellite

  ERTS-1         Earth Resources Technology Satellite -- 1

  ES/DT          Eastern Standard/Daylight Time

  ESA            European Space Agency

  ESA            Earth Sensor Assembly

  ESAD           Earth Science And Applications Data System

  ESB            Essential Bus

  ESCC           Electrically Self-Calibrating Cavity

  ESCIF          Electrical S/C I/F

  ESCP           Emulated Spacecraft Control Processor

  ESDD           Earth Science Data Directory

  ESDIS          Earth Science Data and Information System

  ESDISP         ESDIS Project

  ESDT           Earth Science Data Type

  ESE            Earth Sciences Enterprise

  ESE            Earth Science Enterprise (Formerly Mission To Planet
                 Earth)

  ESFU           Enhanced Standard Format Unit

  ESH            EDU Service Header

  ESH            EDOS Service Header

  ESIC           Earth Science Information Center

  ESID           EOSDIS Systems Interface Document

  ESIOP          Environment-Specific Inter-ORB Protocol

  ESIP           Earth Science Information Partner

  ESIPS          EOSDIS Science Investigator-Led Processing System

  ESIS           ESA Space Information Systems

  ESJWG          Earth Science Joint Working Group

  ESMC           Eastern Space And Missile Center

  ESMES          EOS System Management And Engineering Site

  ESMO           Earth Science Mission Operations

  ESMOS          Earth Science Mission Operation System

  ESMP           ECS Schedule Management Plan

  ESMR           Electronically Scanning Microwave Radiometer

  ESN            EOSDIS Science Network (ECS) (Replaced By Ebnet)

  ESnet          Energy Sciences Network

  ESnet          Energy Science network

  ESO            ECS Server Object

  ESOC           European Space Operations Center

  ESOC           Equivalent State Of Charge

  ESOC           EOSDIS System And Operations Concept (Document)

  ESOD           Earth Science On-Line Directory

  ESOO           ESDIS Science Operations Office

  ESPAD          Expert System For Platform Anomaly Diagnosis

  ESQL           Earth Science Query Language

  ESR            Egs Status Review

  ESR            Electrical Subsitution Radiometer

  ESRI           Environmental Systems Research Institute

  ESRIN          European Space Research Institute

  ESSAAC         Earth System Science And Applications Advisory Committee

  ESSB           Earth System Sciences Building

  ESSC           European Space Science Committee

  ESSC           Earth Systems Science Committee

  ESSE           EDOS System Support Environment

  ESSIC          Earth System Science Interdisciplinary Center

  ESSn           Earth Science Space Network

  ESSn           EOS Science Support Network

  ESSn           EOSDIS Science Support Network

  ESSO           Earth Science Support Office

  ESSP           Earth System Science Pathfinder

  ESSP           Earth Science Systems Program

  ESST           Earth Science Search Tool

  EST            Eastern Standard Time

  ESTAR          Electrically Scanned Thinned Array Radiometer

  ESTEC          European Space Research And Space Technology Centre

  ESTMS          Eoc Spacecraft Time Management Software

  ESTOL          EOS Standard Text And Operation Language

  ESUS           ECS Scientist User Survey

  ESWG           EOSDIS Security Working Group

  ET             Evapo Transpiration

  ET             Ephemeris Tool

  ETE            End-To-End

  ETE            End To End

  ETFSP          Enhanced Technology Flight Segment Prototype

  Ethernet       Low-Level Protocol For High-Speed Networks

  ETL            EOS Team Lead

  ETM            Engineering Test Model

  ETM+           Enhanced Thematic Mapper Plus (Landsat 7)

  ETR            Element Test Review

  ETR            Eastern Test Range

  ETRD           Ebnet Traffic Requirements Database

  ETRO           Estimated Time Return To Operations

  ETS            EOS Test System

  ETS            Electronic Test Signal

  ETS            Emissivity/Temperature Separation

  ETS            EOSDIS Test System

  ETS-VII        Engineering Test Satellite - Vii (Japan)

  ETSF           Eoc Training Simulator Facility

  ETSF           EOS Telemetry Simulator Facility

  ETSF           EOSDIS Test System Facility

  ETTS           ECS Trouble Ticketing System

  EU             Engineering Unit

  EUI            Epoch User Interface

  EUMETSAT       European Organization For The Exploitation Of
                 Meteorological Satellites

  EUMS           ESDIS User Model Scenario

  EURECA         European Retrievable Carrier

  EUV            Extreme Ultraviolet

  EUVE           Extreme Ultraviolet Explorer

  EVAL           Evaluation

  EVI            Enhanced Vegetation Index

  EVP            EDG Valids Processing

  EVR            ECS Verification Report

  EWCIP          Extended Web Communication Interface Prototype

  EWR            Eastern-Western Range (A Safety Document Header)

  Exotech        Portable, 4-Band VIS-NIR Radiometer

  F&PRS          Functional And Performance Requirements Specification

  F&PRS          Functional and Performance Specification

  F&PS           Functional and Performance Specification

  F/L            Forward Link

  F/P-INT        Fabry Perot Interferometer

  FACE           Florida Area Cumulus Experiment

  FAM            File Access Methods

  FAM            Forward-Viewing Analog-Electronic Module (MODIS)

  FAME           Formatting And Multiplexing Equipment

  FAPAR          Fraction Absorbed Photosynthetically Active Radiation

  FAQ            Frequently Asked Questions

  FAR            Federal Acquisition Regulation

  FAR            Final Acceptance Review

  FARM           Frame Acceptance Reporting Mechanism

  FAS            FOS Analysis Subsystem

  FASINEX        Frontal Air Sea Interaction Experiment

  FAST           Fast Auroral Snapshot Explorer

  FAST-L7A       FAST-Landsat 7 Format

  FAT            Factory Acceptance Test

  FAX            Facsimile Transmission

  FC             Fiber Channel

  FC             Flight Controller

  FC-AL          Fiber Channel-Arbitrated Loop

  FCA            Functional Configuration Audit

  FCAPS          Fault, Configuration, Accountability, Performance And
                 Security

  FCDAS          Fairbanks Command and Data Acquisition Station

  FCI            Functional Configuration Identification

  FDAC           Failure Detection And Correction

  FDD            Functional Design Document

  FDD            Flight Dynamics Division (GSFC Code 550)

  FDDI           Fiber Distributed Data Interface

  FDF            Flight Dynamics Facility  (Replaced By FDS)

  FDF            Flight Dynamics Facility

  FDFEPHEM       FDF-Generated Definitive Orbit Data

  FDIR           Fault Detection And Isolation Recovery

  FDIR           Fault Data Identification And Reporting

  FDM            Frequency Division Multiplexing

  FDM            FOS Data Management Subsystem

  FDM            Fill/Drain Module

  FDMA           Frequency Division Multiple Access

  FDOA           Flight Dynamics Operations Area

  FDR            Fds Design Review

  FDS            Flight Dynamics System

  FDS            Flight Data System

  FDSTP          Fds Test Plan

  FDT            Flight Dynamics Team

  FEC            Forward Error Correction

  FED            Facilities Engineering Division

  FED            Frame Encapsulator/Decapsulator (ECOM)

  FED-STD        Federal Standard

  FEICD          Fds External Interface Control Document

  FEL            Front End Local Area Network

  FEM            Finite Element Model

  FEP            Front End Processor

  FERF           Far End Receive Failure

  FET            Field Effect Transistor

  FEWS           Famine Early Warning System

  FF             Free Flight

  FFT            Fast Fourier Transform

  FGDC           Federal Geographic Data Committee

  FGGE           First Garp Global Experiment

  FIFE           First Islscp Field Experiment 1

  FIP            Federal Information Processing

  FIPS           Federal Information Processing Standard

  FIRE           First Isccp Regional Experiment

  FISOL          Fualt Isolation

  FIX            Federal Internet Exchange

  FK             Foreign Key

  FL             Floating Point Data Type (32 Bit)

  FL             Forward Link

  FLAW           Flight Anomaly Worksheet

  FLC            Fine Loop Control

  FLC            Federal Laboratory Consortium

  FLD            First Level Destination

  FLDB           Fileset Location Database

  FLG            Flag

  FLI            Fluorescence Line Imager

  FLID           First Look Input Data

  FLOAT          Float Type

  FLOPS          Floating-Point Operations Per Second

  FLP            Flight Load Package

  FLP            Forward Link Processor

  FLPC           Forward Link Physical Channel

  FLPC           Forward Link Processing Channel

  FLPF           Forward Link Processing Function

  FLPP           Forward Link Physical Port

  FLS            Flight Standard

  FLSS           Forward Link Service Status

  FLT            Flight

  FltSW          Flight Software

  FLUXNET        Flux Network

  FM             Fault Management

  FM             Frequency Modulation

  FM's           Flight Models

  FM-1           Flight Model 1

  FMAS           Fault Management Application Service

  FMEA           Failure Mode And Effects Analysis 

  FMECA          Failure Modes, Effects, Criticality Analysis

  FMG            File Management

  FMH            Free Molecular Heating

  FMI            Finnish Meteorological Institute - Finnish Space Agency

  FMI            Finnish Meteorological Institute

  FMM            Folding Mirror Mechanism

  FMT            Flight Software (Fsw) Maintenance Team

  FMU            Formatter/Multiplexer Unit

  FNL            Final Analysis And Forecast System, Global Analysis

  FNS            Fiber Network Services

  FOC            Full Operational Capability

  FOH            Flight Operations Handbook

  FOIA           Freedom Of Information Act

  FOLD           Federally-Owned Landsat Data

  FOM            Flight Operations Manager

  FOO            Flight Of Opportunity

  FOO            Flight Operations Office

  FOP            Flight Operations Procedures

  FOP            Frame Operations Procedure

  FOPR           Flight Operations Procedures Review

  FOR            Flight Operations Review

  FOR            Field Of Regard (The Total Sweep Available For
                 Instantaneous Fields Of View)

  FORMATS        FDF Orbital And Mission Aids Transformation System

  FORR           Flight Operations Readiness Review

  FORTE          Fast On Orbit Recording Of Transient Events

  FORTRAN        Formula Translation  (Computer Language)

  FOS            Flight Operations Segment (ECS)

  FOSI           Formatting Output Specification Instance

  FOT            Flight Operations Team

  FOV            Field Of View

  FOWG           Flight Operations Working Group

  FP             Floating Point

  FPA            Floating Point Arithmetic

  FPA            Focal Plane Array

  FPA            Focal Plane Assembly

  FPAR           Fraction Of Photosynthetically Active Radiation

  FPAR           Fraction Of Photosynthetic Radiation (Absorbed By
                 Vegetation)

  FPAR           Fractional Photosynthetically Active Radiation

  FPD            Flight Projects Directorate

  FPDMSS         Flight Projects Directorate Multidiscipline Support
                 Services

  FPGA           Field Programmable Gate Array

  FPM            Fine Point Mode

  FPMH           Failures Per Million Hours

  FPRR           Flight Production Readiness Review

  FPS            Fast Packet Switch

  FPT            Filter/Pressure Transducer (PS)

  FQT            Formal Qualification Testing

  FR             Frame Relay

  FRB            Failure Review Board

  FRC            Federal Record Center

  FRD            Functional Requirements Document

  FRDS+          Failure-Resistant Data System Plus

  FREESTAR       Fast Reaction Experiments Enabling Science Technology
                 Applications And Research

  FRF            Frame Relay Forum

  FRGF           Flight Removable Grapple Fixture

  FRM            FOS Resource Management Subsystem

  FRN            Frame Routing Network

  FRR            Flight Readiness Review

  FRS            File Retrieval Subsystem

  FS             File Structure (Use File-Structure For EDHS Search)

  FS             Flight Segment

  FSB            Flight Software Branch

  FSD            Flight Systems Division

  FSDD           Flight Software Design Document

  FSDR           Final System Design Review

  FSE            Flight Support Equipment

  FSE            Fot S/C Evolutions

  FSK            Frequency-Shift Keying

  FSM            Flight Systems Manual

  FSME           Flight Software Maintenance Element

  FSMG           Flight Software Maintenance Group

  FSMS           File And Storage Management System

  FSOM           Flight System Operations Manual

  FSS            Flight Support System

  FSS            Fine Sun Sensor

  FSSP           Forward Scattering Spectrometer Probe

  FST            Field Support Terminal (ECS)

  FST            Flight Support Team

  FST            Flight Simulation Test

  FSTB           Flight Software Test Bed

  FSTL           Flight Support Team Lead

  FSTR           Flight Systems Test Requirements

  FSW            Flight Software

  FSWS           Flight Software Subsystem

  FTA            Transparent File Access 

  FTAM           File Transfer, Access, And Management

  FTAM           File Transfer Access Method

  FTDS+          Failure-Tolerant Disk Systems Plus

  FTE            Factory Test Equipment

  FTE            Full-Time-Equivalent

  FTE            Full Time Equivalent

  FTGT           First TDRSS Ground Terminal

  FTL            Fos Telemetry Subsystem

  FTM            File Transfer Management

  FTM            Filter/Transducer Module (PS)

  ftp            File Transfer Protocol

  FTP            File Transfer Protocol

  ftpd           File Transfer Protocol Daemon

  FTS            Fourier Transform Spectrometer

  FTSB           Flight Software Test Bed (or Bench)

  FUI            Fos User Interface Subsystem

  FW             Firewall

  FW             Framework (TES Science Software)

  FWTK           Firewall Toolkit

  FY             Fiscal Year

  FYI            For Your Information

  G/B            Gateway/Bridge

  G/E C&S        Ground Equipment Control and Status

  G/S            Ground System

  G/T            Gain over Temperature

  G/T            Gain to Noise Temperature Ratio

  GAC            Global Area Coverage (AVHRR)

  GAIM           Global Analysis, Interpretation, and Modeling (Program)

  GAM            General Administrative Message

  GAME           GOALS Asian Monsoon Experiment

  GAME           GEWEX Asian Monsoon Experiment

  GAME-T         GEWEX Asian Monsoon Experiment - Tropics

  GAMUT          Gas & Aerosol Monitor of the Upper Troposphere

  GAP            Gap Analysis Program

  GAQD           originator routing code for IIRV messages

  GARP           Global Atmosphere Research Program

  GAS            Get Away Special

  GASCOFIL       Gas Correlation Filter

  GAST           Greenwich Apparent Sidereal Time

  GATE           GARP Atlantic Tropical Experiment

  GATT           Government Acceptance Test Team

  GB             Gigabyte  (10\*\*9 bytes)

  Gb             Gigabit (10\*\*9 bits)

  GB             Giga Byte

  GBAD           Ground Based Attitude Determination

  GBFM           Global Boreal Forest Mapping

  Gbits          Giga Bits: 1024\*1024\*1024\* Bits

  GBps           Gigabytes per second

  Gbps           Gigabits per second

  GC             Global Change

  GC             Ground Controller

  GC/MS          Gas Chromatograph Mass/Sepctrometer

  GCC            Global Change Category

  GCC            Goddard Communication Coordinator

  GCC            Ground Command Count

  GCDIS          Global Change Data and Information System

  GCE            Cround Control Equipment

  GCF            Ground Communications Facility (DSN)

  GCIP           GEWEX Continental-Scale International Project

  GCLDC          Global Change Landsat Data Collection

  GCM            General (or global) Circulation Model

  GCM            Ground Control Message

  GCM            General Circulation Model

  GCMD           Global Change Master Directory

  GCMR           Ground Configuration Message Request

  GCMR           Ground Control Message Request

  GCMR           Global Circulation Model Request

  GCNAM          Global Climate Middle Atmosphere Model

  GCOS           Global Climate Observing System

  GCP            Ground Control Point

  GCRP           Global Change Research Program

  GCSS           GEWEX Cloud System Study

  GCT            Geo-Coordinate Transformation

  GCTE           Global Change and Terrestrial Ecosystems (IGBP)

  GCTP           General Cartographic Transformation Package

  GCTP           General Cartography Transformation Package

  GDAAC          Goddard Distributed Active Archive Center

  GDAO           Goddard \[Space Flight Center\] Data Assimilation Office

  GDAS           Global Data Similation Model

  GDAS           Global Data Assimilation System

  GDC            GeoData Center (University of Alaska, Fairbanks)

  GDE            Gimbal Drive Electronics

  GDPS           Ground Data Processing System

  GDPS           Ground Data Processing Software

  GDR            Geophysical Data Record (JPL)

  GDS            ground data system

  GDS            Global Directory Services

  GEBA           Global Energy Balance Archive

  GEDEX          Greenhouse Effect Detention Experiment

  GEIA           Global Emissions Inventory Activity

  GEMs           Graphite Epoxy Motors

  GEMS           Global Environment Monitoring System

  GEN            Generator

  GENESIS        Global Environmental and Ecological Simulation of
                 Interactive Systems

  GEO            Geostationary Earth Observation

  GEO            Geosynchronous earth orbit

  GEO            Geostationary earth orbiter

  GEOCOMP        GEOcoding and COMPositing system

  GEOS           Goddard Earth Observing System

  Geosat         Geodetic Satellite

  GEOTAIL        Geomagnetic Tail Laboratory

  GeoTIFF        Geographic Tagged Image File Format

  GERB           Geostationary Earth Radiation Budget

  GES            Goddard's Earth Sciences

  GES            GSFC\'s Earth Sciences

  GES DAAC       GSFC Earth Science DAAC

  GESSEP         GSFC Earth Space Science Education Project

  GETS           General Environmental Test Specification

  GEVS           General Environmental Verification Specification

  GEVS-SE        General Environmental Verification Specification for STS
                 & ELV, Payloads, Subsystems, and Components

  GEWEX          Global Energy and Water Cycle Experiment

  GFCR           Gas Filter Correlation Radiometer

  GFDL           Geophysical Fluid Dynamics Laboratory

  GFE            Government Furnished Equipment

  GFI            Government Furnished Information

  GFLOPS         Giga (10\*\*9) Floating Point Operations Per Second

  GFM            Global Fault Manager

  GFM            Global Fault Management

  GFM            Grating and Field Mirror (OPB)

  GFO            Geosat Follow-On

  GFP            Government Furnished Property

  GFRP           Graphite Fiber-Reinforced Plastic

  GFSW           GLAS Flight Software

  GFY            Government Fiscal year

  GFZ            GeoForschungs Zentrum (Potsdam, Germany)

  GGD            Global Geocryology Database

  GGI            Global Positioning System Geoscience Instrument

  GGP            Gateway-to-Gateway Protocol

  GGS            Global Geospace Science

  GGT            Gravity Gradient Torques

  GHA            Greenwich Hour Angle

  GHB            Goddard Handbook

  GHCC           Global Hydrology and Climate Center

  GHCN           Global Historical Climatology Network

  Ghe            Gaseous Helium

  GHRC           Global Hydrology Resource Center

  GHz            Giga Hertz

  Ghz            Gigahertz

  GI             Global Imager

  GIDEP          Government Industry Data Exchange Program

  GIF            Graphical Iinterchange Format

  Giga           billion (10\*\*9)

  GIGAPOP        Gigabit Point-of-Presence

  GII            Geographic Information System

  GIIS           General Instrument Iinterface Specification

  GIIS           General Instrument Interface Specifications

  GIM            Global Intergration and Modeling

  GIMMS          Global Inventory Modeling and Monitoring Study

  GIMTACS        GOES I-M Telemetry and Command System

  GIOP           General Inter-ORB Protocol

  GIP            Guest Investigator Program

  GIPS           Giga instructions (10\*\*9) Per Second

  GIRD           General Interface Requirements Document

  GIS            Geographical Information System

  GISP           Greenland Ice Sheet Program

  GISS           Goddard Institute for Space Studies

  GIT            Group Integration Test

  GKS            Graphical kernel system

  GL             Generation Language

  GLA            Goddard Laboratory for Atmospheres

  GLAS           Geoscience Laser Altimeter System

  GLAST          Gamma Ray Large-Area Space Telescope

  GLCTS          Global Landcover Test Site Initiative

  GLI            Global Imager

  GLIMS          Global Land and Ice Monitoring from Space

  GLIS           Global Land Information System (EDC)

  GLL            Gallileo

  GLM            Geostationary Meteorological Satellite

  GLOBE          Global Backscatter Experiment

  GLOBE          Global Learning and Observations to Benefit the
                 Environment

  GLOBEC         Global Ocean Ecosystem Dynamics

  GLOCHEM        Global Observations of Atmospheric Chemistry

  GLRS           Geoscience Laser Ranging System

  GLRS-A         Geoscience Laser Ranging System Altimeter

  GLRS-R         Geoscience Laser Ranging System Ranger

  GMAO           Global Modeling and Assimilation Office

  GMI            Goddard Management Instruction

  GMPCS          Global Mobile Personal Communications Services

  GMR            Giant Magnetorisistive

  GMS            Geostationary Meteorological Satellite

  GMST           Greenwich Mean Sidereal Time

  GMT            Greenwich Mean Time

  GN             Ground Network

  GN&C           Guidance, Navigation and Control

  GN&C           \"Guidance, Navigation and Control\"

  GN&CS          Guidance, Navigation, and Control Subsystem (Terra AM-1)

  GNATS          Gnu Anomaly Tracking System

  GNC            Gatineau, Canada (satellite ground station)

  GNCC           Guidance, Navigation & Control Controller

  GNCC           Guidance, Navigation & Control Center

  GNCC           \"Guidance, Navigation and Control Controller\"

  GND            Ground

  GNMP           Government Network Management Profile Protocol

  GNMP           GOSIP metowrk management protocol

  GNP            Gross National Product

  GNS            Ground Network System

  GNSS           Ground network scheduling system

  GOALS          Global Ocean-Atmosphere-Land System (WCRP program)

  GOE            Ground Operations Exercise

  GOES           Geostationary Operational Environmental Satellite

  GOFC           Global Observation of Forest Cover

  GOLD           Global On-Line Directory (NSIDC)

  GOME           Global Ozone Monitoring Experiment

  GOMI           Global Ozone Monitoring Iinstrument

  GOMOS          Global Ozone Monitoring by Occultation of Stars (ESA)

  GOMR           Global Ozone Monitoring Radiometer

  GONG           Global Oscillations Network Group

  GOOS           Global Ocean Observing System

  GOPM           Goddard Orbital Parameters Message

  GOPS           Giga Operations (10\*\*9) Per Second

  GOS            Geomagnetic Observing System

  GOSIP          Government Open Systems Interconnection Profile

  GOTS           Government-Off-The-Shelf

  GOTS           Government Off-The Shelf

  GOWG           Ground Operations Working Group

  GP4            General Perturbations Theory

  GPC            Global Positioning Center

  GPCC           Global Precipitation Climatology Centre, Frankfurt,
                 Germany

  GPCP           Global Precipitation Climatology Project

  GPD            Goddard Policy Directive (formerly called GMI)

  GPG            Goddard Procedures and Guidelines (formerly called GHB)

  GPG            Goddard Procedures and Guidelines

  GPI            Global Precipitation Index

  GPIB           General Purpose Interface Bus (computer commo bus -- HP)

  GPL            G1 Parameter List

  GPP            Gross Primary Productivity

  GPP            General-Purpose Processor

  GPPDI          Global Primary Production Data Initiative

  GPROF          Goddard PRO Filing algorithm for instantaneous rain
                 retrieval

  GPS            Geophysical Products System

  GPS            Global Positioning System

  GPS            Global Positioning Satellite

  GPS            Geophysical Processor System

  GPSDIS         Global Positioning System Data Information System (JPL)

  GPSDR          Global Positioning System Demonstration Receiver

  GPSOS          Global Positioning Sensor Occultation System

  GPSR           Global Positioning Satellite Receiver

  GPSSS          Global Positioning System Sustaining Support

  GPT            Generic Protocol Translator

  GPTS           Ground Power Test Set

  GR             Gradient  Ratio

  GRACE          Gravity Recovery And Climate Experiment

  GRASP          Graphical and Statistical Data Analysis Package

  GRD            Ground

  GRD            Geo-rectified Radiance Product (MISR)

  GRDC           Global Runoff Data Center

  GREM           Geopotential Research Explorer Mission

  GRFM           Global Rainforest Mapping Project

  GRI            Ground Reference Image

  GRIB           Gridded Binary

  GRID           \[UNEP\] Global Resource Information Data Base 

  GRILLE         Grille Spectrometer

  GRIPS          Ground Systems Development Software Requirements
                 Inspection Planning Sheet

  GRIS           Global Resources Information System

  GRP            Geophysical Research Program

  GRT            Ground Receipt Time

  GS             Ground Segment

  GS             \[EOS\] Ground System

  GS             Geological Survey

  GS             Global Survey

  GS             Ground System

  GS&O           Ground Systems and Operations

  GSAS           GLAS Science Algorithms System

  GSCT           Ground System Compatibility Test

  GSDE           Ground System Development Environment

  GSDS           Ground System Design Specifications

  GSE            Ground Support Equipment

  GSE            Government Supplied Equipment

  GSEF           GLAS Sustaining Engineering Facility

  GSESW          Ground Support Equipment Software

  GSFC           Goddard Space Flight Center

  GSFC/WFF       Goddard Space Flight Center/Wallops Flight Facility

  GSI            Government Source Iinspection

  GSI            Ground System Iintegration

  GSIF           Ground Station Interface Facility

  GSIF           Ground System Interface Facility (EDOS component)

  GSIM           Ground System Integration Manager

  GSIP           Ground System Internet Protocol Processor

  GSIP           Ground Station Interface Processor

  GSIP           Ground System Interface Processor (ERPS component)

  GSIWG          Ground System Integration Working Group

  GSJ            Geological Survey of Japan

  GSM            Global System for Mobile Communications

  GSMF           GLAS Software Maintenance Facility

  GSMK           Gaussian Minimum Shift Keying

  GSMS           Ground System Management Subsystem (ASTER)

  GSMST          Ground Segment Mixed Simulation and Test

  GSO            Global Server Object

  GSOC           Guide Star OCcultation

  GSOP           Ground System Operations Project

  GSR            Ground System Review

  GSRB           Ground System Requirements Baseline

  GSRD           Ground System Requirements Document

  GSS            Ground Support System

  GSS            Generic Security Standard

  GSSM           Ground Systems Study Manager

  GSTDN          Ground Spaceflight Tracking and Data Network

  GSTDN          Goddard Space Flight Tracking and Data Network

  Gt             Gigaton

  GT             Ground Tterminal

  GTAS           Generic Ttrending and Analysis System

  GTC CB         GDAAC Testbed Change Control Board

  GTCE           Global Tropospheric Chemistry Experiment

  GTDS           Goddard Trajectory Determination System

  GTDU           Ground Transfer Data Unit

  GTE            Global Tropospheric Experiment

  GTOPO30        Global 30 Arc-Second Elevation Data Set

  GTOS           Global Terrestrial Observing System

  GTS            Global Telecommunications System

  GTS            Ground Test System

  GTT            Ground Truth Terminal

  GTWAY          Gateway \[for Version 0 interoperability\]

  GTWAY          Version 0 Interoperability Gateway CSCI

  GUI            Graphical UserInterface

  GURP           Goddard Uncosted Reduction Project

  GV             Ground Validation data (TRMM)

  GV             ground validation

  GV             TRMM Ground Verification

  GVaP           GEWEX Water Vapor Project

  GVSC           Generic VHSIC Spaceborne Computer

  GW             Gateway

  GWE            Global Weather Experiment

  GWP            Global Warming Potential

  GWS            Gateway Service

  GXA            Gimballed X-band Antenna

  H&CS           Harness And Coax Subsystem

  H&S            Health And Safety

  H/K            Housekeeping

  H/L            Hardline

  H/R I/F        High-Rate Interface

  H/W            Hardware

  HAB            Habitation Module Shuttle/Space Station

  HAB            Harmful Algal Blooms

  HAC            Hughes Aircraft Corporation

  HAD            Hardware Data Acquisition

  HAIRS          High Accuracy Inter-Satellite Ranging System

  HAIS           Hughes Applied Information Systems (ECS Team)

  HAL            Hardware Abstraction Layer

  HALE           High Altitude Long Endurance

  HALOE          Halogen Occultation Experiment

  HAPEX          Hydrological-Atmospheric Pilot Experiment

  HAPS           Hazardous Air Pollutant Standards

  HARC           Houston Advanced Research Center

  HazDat         Hazardous Substance Release/Health Effects Database

  HB             Handbook

  HBK            Handbook

  HC             Host Controller

  HCA            Heater Control Assembly

  HCCL           Half Crystal Can Latching 9relay)

  HCD            Hardware Command Distribution

  HCDN           Hydro-Climatic Data Network

  HCE            Hardware Configuration Engineer

  HCE            Heater Controlled Electronics

  HCFC           Hydrochlorofluorocarbons

  HCL            Hughes Class Library

  HCMM/AEM-1     Heat Capacity Mapping Mission/Applications Explorer
                 Mission

  HCR            HDF EOS Configuration Record

  HD             Hard Drive

  HD             High Density

  HD             Hard Disk

  HDA            Hardware Data Acquisition

  HDDR           High Data Rate Recorder

  HDDT           High-Density Digital Tapes

  HDDT           High-Density Data Tape

  HDE            Heater Drive Electronics

  HDF            Hierarchical Data Format

  HDF-EOS        Hierarchical Data Format - Earth Observing System

  HDLC           High Level Data Link Control

  HDOS           Hughes-Danbury Optical Systems (A Company)

  HDQ            High-Speed Data Queue

  HDR            Header

  HDRM           Hold Down And Release Mechanism

  HDRR           High Data Rate Recorder

  HDRS           Hold Down And Release System (Solar Array)

  HDRS           Hold Down Release System

  HDS            Horizontal Display Shift

  HDSL           High-Speed DSL

  HDT            High Density Tape

  HDT            Harmonic Drive Technologies (A Company)

  HEA            Head-End Assembly

  HEAO           High-Energy Astronomy Observatory

  HEAT           Hitchhiker Experiments Advancing Technology

  HEC            Header Error Control

  HEC            Header Error Check

  HEDS           Human Exploration And Development Of Space

  HEIFE          Heihe Basin Field Experiment

  HEO            High Earth Orbit

  HESSI          High Energy Solar Spectroscopic Imager

  Hex            Hexadecimal

  HF             High Frequency

  HFC            Hybrid Fiber Coax

  HGA            High Gain Antenna (Terra AM-1)

  HGML           Hyper Graphics Markup Language (Graphical Alternative To
                 HTML)

  HH             Hours, Two Digit Format

  HH             Horizontal, Horizontal Polarization

  HI             Human Interactions

  HiFD           High-Capacity Floppy Disk

  HIFE           Hardware Interface Emulator

  HIMSS          High-Resolution Microwave Spectrometer Sounder (Replaced
                 By MIMR)

  HIPPI          High Performance Parallel Interface

  HIRDLS         High-Resolution Dynamics Limb Sounder

  HIRDLS         High Resolution Dynamics Limb Sounder

  HIRIS          High-Resolution Imaging Spectrometer

  HIRRLS         High-Resolution Research Limb Sounder

  HIRS           High-Resolution Infrared Sounder

  HIRS/2         High Resolution Infrared Radiation Sounder Version 2

  HIS            High-Resolution Interferometer Sounder

  HIST           History

  HIT            Heavy Ion Telescope (TEDA)

  HK             Housekeeping

  HK1            Housekeeping 1 data stream (realtime and playback)

  HLDC           High-Level Discrete Commands

  HLE            High Level Event

  HLL            High Level Language

  HLPC           High Level Pulse Commands

  HMCF           Hyperbolic Maintenance And Checkout Facility

  HMD            Hardware Maintenance Depot

  HMI            Human Machine Interface

  HMMP           Hyper Media Management Protocol

  HMMR           High-Resolution Multifrequency Microwave Radiometer

  HMMS           Hyper Media Management Schema

  HMOM           Hyper Media Object Manager

  HNLC           High Nutrient, Low Chlorophyll

  HOL            Higher Order Language

  HOLAP          Hybrid Online Analytical Processing

  HOM            Hotine Oblique Mercator

  HOSC           Huntsville Operations Support Center

  HotJava        Sun Microsystems' Web Browser, Written In Java

  HP             Hewlett Packard

  HPA            High Power Amplifier

  HPC            High Pulse Command

  HPC            Hand-Held PC

  HPCC           High Performance Computing Center

  HPCC           High Performance Computing And Communications

  HPCE           High Power Control Electronics

  HPDI           High Speed Parallel Digital Interface

  HPF            High-Performance Fortran

  HPOV           Hewlett Packard Open View (COTS Product)

  HPPI           High Performance Parallel Interface

  HQ             Headquarters

  HQ             Headquarters (NASA)

  HQAM           Hardware Quality Assurance Manual

  HQTR           Headquarters (NASA)

  HQX            Binhex (File Name Extension)

  HR             High Rate

  HRC            High Rate Channel

  HRD            Hi-Rate Science (X-Band) Data

  HRDCW          High Rate Data Cable Way

  HRDH           High-Rate Data Handling

  HRDI           High Resolution Doppler Interferometer

  HRDL           High Rate Data Link

  HRDM           High-Rate Demultiplexer

  HRFM           High-Rate Frame Multiplexer

  HRG            Hemispherical Resonator Gyro

  HRG            High Rate Gyro

  HRIS           High-Resolution Imaging Spectrometer

  HRM            High-Rate Multiplexer

  HRMS           High Rate Matrix Switch

  HRMSI          High Resolution Multispectral Stereo Imager

  HROI           High-Resolution Optical Instrument

  HRPT           High-Resolution Picture Transmission (AVHRR)

  HRRL           High Rate Return Link

  HRS            High Rate Switch

  HRS            High Resolution Spectrograph

  HRS            High Resolution Spectrometer

  HRS            Heat Rejection System (AIRS)

  HRS            High Rate Science

  HRS            High Rate Simulator

  HRSR           High-Resolution Scanning Radiometer (NOAA)

  HRTR           High-Rate Tape Recorder

  HRTTS          High Rate Telemetry Test Set

  HRV            High-Resolution Video (SPOT)

  HS             High-Speed

  HSB            Humidity Sounder - Brazil (A Derivative Of AMSU-B,
                 Replacing MHS)

  HSB            Humidity Sounder for Brazil

  HSC            High-Speed Channel

  HSCT           High-Speed Civil Transport

  HSIM           High-Speed Interface Module

  HSKPG          Houskeeping

  HSM            Hierarchical Storage Management

  HSMT           Helical Scan Magnetic Tape (Videotape)

  HSRP           High Speed Research Program

  HSS            High Speed Serial

  HSSI           High-Speed Serial Interface

  HST            Hubble Space Telescope

  HSTF           High-Speed Telemetry Formatter

  HSTRA          High-Speed Token Ring Alliance

  HSTX           Hughes Science Technology Excellence (Now RSTX)

  HTF            Humid Tropical Forest

  HTI            Hughes Training Inc. (Now RTI)

  HTML           Hypertext Markup Language

  HTPB           Hydroxyl-Terminated Polybutediene

  HTR            Heater

  HTS            High-Rate Test System

  http           Hypertext Transfer Protocol  (Used To Link And Transfer
                 Hypertext (HTML) documents)

  HUBEX          Huaihe Basin Experiment

  HVAC           Heating, Ventilation And Air Conditioning

  HVAC           High Voltage Alternating Current

  HW             Hardware

  HWCI           Hardware Configuration Item

  HWI            Hardware Interface

  HWM            High Water Mark

  HX             Heat Exchanger

  HyTime         Hypermedia/Time-Based Structuring Language (Not W3C)

  Hz             Hertz

  HZB            Hazard Bus

  I              In-Phase Channel

  I&A            Identification And Authentication

  I&AT           Integration And Acceptance Test

  I&C            Installation And Checkout

  I&T            Integration And Test

  I&T            Information And Technology

  I&TM           Integration And Test Manager

  I&TT           Integration And Test Team

  I-SIPS         ICESat Science Investigator-led Processing System

  I-Team         Integration Team

  I/F            Interface

  I/O            Input/Output

  IA             Interagency Agreement

  IA             Interface Adapter

  IA             Implementation Agreement

  IAB            Internet Architecture Board

  IABP           International Arctic Buoy Program

  IAC            Instrument Alignment Cube

  IACO           Integration Assembly And Checkout

  IACR           ICESat Activity Change Request

  IAD            Interface Agreement Document

  IADB           Interface Analysis Database

  IADL           Instrument Activity Deviation List

  IAE            Instrument Accommodation Engineer

  IAI            Inter-American Institute

  IAL            Instrument Activity List

  IALE           Individual Annual Loss Expectancy

  IAM            Interface Adapter Module

  IAM            Interface Adapter Model

  IAMS           Integrated Assessment Models

  IANA           Internet Assigned Numbers Authority

  IAR            Independent Architecture Review

  IARC           International Arctic Research Center

  IAS            Image Assessment System

  IAS            Instrument Analog Slice (For Non-GRID Accommodation)

  IAS            Instrument Activity Specification

  IAS            Inventory Archive System

  IASI           Infrared Atmospheric Sounding Interferometer

  IASS           Instrument Analysis Support Subsystem

  IATO           Independent Acceptance Test Organization

  IAU            International Astronomical Union

  IAVCEI         International Association Of Volcanology And Chemistry
                 Of The Earth's Interior

  IBP            International Biomed Program

  IBR            Internal Baseline Review

  IBS            Integrated Biosphere Simulator

  IC             Internal Calibration

  IC             Integrated Circuit

  IC MON         Interconnect Monitor

  ICA            Interface Control Agreement

  ICAI           Interactive Computer-Aided Instruction

  ICAS           Interactive CCR Automation System

  ICC            Integrated Circuit Card

  ICC            Instrument Control Center (ECS) (ASTER)

  ICCCM          Inter-Client Communication Conventions Manual (X Window
                 System)

  ICD            Interface Control Document

  ICD            Interface Control Drawing

  ICDR           Instrument Critical Design Review

  ICE            International Cometary Explorer

  ICE            In-Circuit Emulator

  ICE            Instrument Contingency Exercise

  ICE            Inductosyn Electronics (HSB)

  ICESat         \"Ice, Cloud and land Elevation Satellite\"

  ICESat         Ice, Cloud and Land Elevation Satellite

  ICESat-1       Ice, Cloud, And Land Elevation Satellite

  ICF            Instrument Control Facility (ECS)

  ICF            International Cryptography Network

  ICI            Inter Carrier Interface

  ICL            Ingest Client

  ICL            Interactive Command Language

  ICLHW          Ingest Client Hardware \[Configuration Item\]

  ICM            Increment Change Manager

  ICM            Internal Calibration Module

  ICMP           Internet Control Message Protocol

  ICMP           Internet Control Messaging Protocol

  ICMP           Internet Control Management Protocol

  ICN            International Communications Network

  ICO            Initial Check-Out

  ICO            Integration And Checkout

  ICO            Installation And Checkout

  ICO            Intermediate Circular Orbit

  ICOS           Instrument Control Operations Subsystem

  ICP            Internet Caching Protocol

  ICR            Initial Cell Rate

  ICR            Internal Change Request

  ICRCCM         Intercomparison Of Radiative Codes For Climate Models

  ICRF           International Celestial Reference Frame

  ICS            Interoperable Catalogue System

  ICS            Interpretive Computer Simulator

  ICS            Integrated Console Script

  ICSU           International Council Of Scientific Unions

  ICT            Interface Confidence Test

  ICT            Instrument Confidence Test

  ICV            Initial Condition Vector

  ICWG           Interface Control Working Group

  ICWG           International Coordination Working Group

  ID             Identification

  ID             Identifier

  ID             Inside Diameter

  ID             Instrument Delivery

  IDAF           IGAC Debits (Africa Project)

  IDB            Instrument Database

  IDB            Interim Database

  IDD            Instrument Description Document

  IDD            Interface Design Document

  IDD            Instrument Definition Document

  IDD            Interface Definition Document

  IDE            Interactive Development Environment

  IDEA           International Data Encryption Algorithm

  IDEN           Integrated Dispatch Enhanced Network

  IDG            Infrastructure Development Group

  IDG            Infrastructure Data Group

  IDIMS          Interactive Data Integration And Management System

  IDIQ           Indefinite Delivery, Indefinite Quantity

  IDL            Interface Definition Language 

  IDL            Interactive Data Language

  IDM            Ion Drift Meter

  IDN            International Directory Network

  IDPGF          Institutional Data Products Generation Facility

  IDPS           Interface Data Processing Segment

  IDPS           Image Data Processing Subsystem

  IDR            Internal Design Review

  IDR            Incremental Design Review

  IDS            Inter-Disciplinary Science

  IDS            Infrastructure And Development Support

  IDSL           Isdn Digital Subscriber Line

  IE             Information Element

  IEC            International Electrotechnical Commission

  IED            Infrastructure Engineering Division 

  IEEE           Institute Of Electrical And Electronics Engineers

  IEEE-CS        Institute Of Electrical And Electronics Engineering -
                 Computer Science

  IEF            Inventory Exchange Format

  IEH-2          International Extreme Ultraviolet Hitchhiker - 2

  IEL            Institute Of Electrical Engineers Electronic Library

  IELV           Intermediate Expendable Launch Vehicle

  IEOS           International Earth Observing System

  IEP            Integrated Execution Plan

  IERS           International Earth Rotation Service

  IET            Interactive Evaluation Tool

  IET            Instrument Engineering Team

  IETF           Internet Engineering Task Force

  IF             Intermediate Frequency

  IF             Interface

  IFB            Invitation For Bids

  IFC            Intensive Field Campaign

  IFDR           Instrument Final Delivery Review

  IFJ            In-Flight Jumper

  IFL            Interfacility Link

  IFMP           Integrated Financial Management Project

  IFO            Intensive Field Observation

  IFOU           Instrument Flight Operations Understanding

  IFOV           Instantaneous Field Of View

  IFPRR          Instrument Flight Production Readiness Review

  IFREMER        Institu Francais De Recherche Poor l'Exploration De La
                 Mer

  IFWG           Interface Working Group

  IGAC           International Global Atmospheric Chemistry

  IGAP           International Global Aerosol Program

  IGBP           International Geosphere-Biosphere Program

  IGBP-DIS       International Geosphere-Biosphere Program Data And
                 Information System

  IGCRP          International Global Change Research Program

  IGDR           Interim Geophysical Data Record (JPL)

  IGE            International Ground Experiment

  IGES           Intial Graphics Exchange Specification

  IGES           Institute For Global Environmental Strategies

  IGMP           Internet Group Management Protocol

  IGMP           Internet Group Multicast Protocol

  IGN            International Geodedic Network

  IGO            Intergovernmental Science Organization

  IGOS           Integrated Global Observing Strategy

  IGP            Interior Gateway Protocol

  IGPB           International Geosphere And Biosphere Research Program
                 (Uses ADEOS Data)

  IGPPDI         Global Primary Production Data Initiative

  IGR            Instantaneous Geographic Region

  IGS            International Ground Station

  IGS            Inertial Guidance System

  IGS            ICEsat Ground System

  IGSE           Instrument Ground Support Equipment

  IGST           ICESat Ground System Test

  IGTWY          External Communications Gateway

  IH             Internet HUB

  IHCI           Internetworking Hardware Configuration Item

  IHDP           International Human Dimensions Programme

  IHP            International Hydrological Program

  II             Interdisciplinary Investigator

  IIAS           Interactive Image Analysis System (ASF) 

  IICF           Interdisciplinary Investigator Computing Facility

  IICS           International Interoperability Catalog Systems

  IID            Instrument Interface Document

  IID            Independent And Identically Distributed

  IIDM           Ion Drift Meter

  IIF            Infrastructure Interface

  IIOP           Internet Inter-ORB Protocol (CORBA Message Protocol Used
                 On A TCP/IP network)

  IIP            Instrument Incubator Program

  IIR            Instrument Interface Review

  IIR            Integrated Information Repository

  IIR            International Instrument Review

  IIRD           Instrumentors Interface Requirements Document

  IIRV           Improved Inter-Range Vector

  IIS            Inter-Disciplinary Investigators

  IIVV           Independent Integration, Verification, And Validation

  IIVV           Independent Integration, Verification And Validation

  IIWG           Interdisciplinary Investigator Working Group

  ILAS           Improved Limb Atmospheric Spectrometer

  ILAS-II        Improved Limb Atmospheric Spectrometer II (ADEOS)

  ILEC           Incumbent Local Exchange Carrier

  ILG            Infrastructure Library Group

  ILM            Inventory, Logistics, And Maintenance Manager

  ILM            Inventory, Logistics, Maintenance

  ILMI           Interim Link Management Interface

  ILMI           Interim Local Management Interface

  ILN            Intermediate Logic Network

  ILP            Integrated Logistics Plan

  ILS            Integrated Logistics Support

  ILS            Integrated Logistic Support

  ILSMT          ILS Management Team     

  ILSO           Ils Office

  ILSP           ILS Plan     

  ILSPM          Ils Program Manager

  ILSS           ILS System

  ILSWD          Integrated Logistics Support Working Database

  IM             Instrument Manager

  IMA            Integrated Microwave Assembly

  IMAGE          Imager For Magnetopause To Aurora Global Exploration

  IMAP           Internet Message Access Protocol

  IMARPE         Instituto Del Mar De Peru

  IMAS           Integrated Multispectral Atmospheric Sounder

  IMB            Investigator Of Micro-Biosphere

  IMC            Intermodule Connector

  IMD            ICESat Mission Director

  IMDC           Integrated Mission Design Center

  IMF            Integrated Metastorage Facility

  IMG            Interferometric Monitor

  IMG            Interferometric Monitor For Greenhouse Gases

  IMOC           International Missions Operations Center

  IMOC           ICESat Mission Operations Center

  IMOK           I Am OK (A Computer Bit Uniquely Associated With MODIS
                 Operations)

  IMP            Implementation

  IMP            Instrument Mounting Plate

  IMP            Imager For Mars Pathfinder

  IMS            Information Management System (Obsolete ECS Element
                 Name)

  IMS            Information Management Service

  IMS            Information Management Subsystem

  IMS            Information Management System

  IMSL           International Mathematical And Statistical Libraries

  IMT            Integrated Mission Timeline

  IMU            Inertial Measurement Unit

  In-lbs         Inch Pounds

  INCI           Internetworking Configuration Item

  INCR           Internal Non-Conformance Report

  INDOEX         Indian Ocean Experiment

  INFEO          Information About Earth Observation

  info           Information

  INFR           Infrastructure (Subsystem)

  INGST          Ingest Services

  INGST          Ingest Subsystem

  INGST          Ingest Services CI

  INHCI          Internetworking Hardware Configuration Item

  INMS           Ion And Neutral Mass Spectrometer

  INN            Internet News

  Inode          Index Node

  INODEX         Indian Ocean Experiment

  INORAC         Inquiry, Order, And Accounting System (EDC)

  INPA           Instituto Nacional De Psequisas Da Amazonia (Brazil)

  INPE           National Institute For Space Research Of The Brazilian
                 Ministry Of Science And Technology

  INRA           Institu National De Recherche Agronomoques (France)

  INS            Ingest Subsystem (SDPS)

  INSA           Institu National Des Sciences Appliquees (France)

  INSP           Inspection

  INST           Instrument

  INSTR          Instrument

  INT16          16-Bit Integer Type

  INT8           8-Bit Integer Type

  Intelsat       International Telecommunications Satellite

  INTEX          Intercontinental Chemical Transport Experiment

  IOA            Integrated Operations Architecture

  IOC            Initial Operational Capability

  IOC            Intergovernmental Oceanographic Commission

  IOC            In-Orbit Checkout

  IOC            Instrument Operation Center

  IOCS           I/O Controller Slice

  IOCS           ICESat Orbit Control Software

  IOD            Internal Operational Demonstration

  IOD            Initial Operational Demonstration

  IODB           Instrument Operational Database

  IOE            Instrument Operations Exercise

  IOE            Instruments Operations Exercise

  IONET          IP Operational Network

  IOnet          IP Operational Network

  IOP            Intensive Observing Period

  IOS            Interoperability Subsystem

  IOS            Inventory And Order System (JPL)

  IOS+           Isocell (Isolation Cell)

  IOSDL          Institute Of Oceanographic Sciences Deacon Laboratory

  IOST           Instrument Operational Support Terminal

  IOT            Instrument Operations Team

  IOT            In-Orbit Test

  IOTE           In-Orbit Test Equipment

  IOWG           Instrument Operations Working Group

  IP             Installation Plan

  IP             International Partner

  IP             Internet Protocol

  IPA            Inter-Project Agreement

  IPA            Instrument Platform Assembly

  IPAIDS         Integrated Payload Articulation And Identification
                 System

  IPB            In Plane Bending

  IPC            Instrument Processing Center

  IPC            Inter-Process Communication

  IPCC           Intergovernmental Panel On Climate Change

  IPD            Information Processing Division (GSFC)

  IPDB           Instruments Database

  IPDC           International Partner Data Center

  IPDP           Integrated Product Development Process (Raytheon
                 Process)

  IPDR           Instrument Preliminary Design Review

  IPDS           Integrated Product Development System (Raytheon Process)

  IPDT           Integrated Product Development Team

  IPDU           Internet Protocol Data Unit

  IPEA           Internet Protocol Encapsulated Addressing

  IPEI           Ionospheric Plasma And Electrodynamics Instrument

  IPF            International Partner Facility

  IPF            Integrated Processing Facility

  IPF            Integrated Payload Facility

  IPF            Integration and Processing Facility (VAFB)

  IPG            Instrument Planning Group

  IPGE           International Partners Ground Equipment

  IPGS           International Partner Ground System

  IPI            International Partner Interface

  IPI            Intelligent Peripheral Interface

  IPICC          International Partners-Instrument Control Center

  IPM            Internal Propulsion Module

  IPMOC          International Partners-Mission Operations Center

  IPng           Internet Protocol, Next Generation

  IPNOC          Internet Protocol Network Operations Center

  IPO            Integrated Program Office (Of NPOESS)

  IPO            Integrated Program Office

  IPOC           International Partner Operations Center

  IPOMS          International Polar Orbiting Meteorological Satellite
                 Committee

  IPPD           Integrated Product Process Development (Raytheon
                 Process)

  IPPF           International Partner Platform

  IPS            Integrated Propulsion System

  IPT            Integrated Product Team

  IPT            DCE Home Page (IPT)

  IPTH           Inter Panel Transfer Harness

  IPU            Internal Power Unit

  IPX            Internetwork  Packet Exchange

  IPX/SPX        Internetwork  Packet Exchange/Sequenced Packet Exchange

  IQ             Intelligent Query

  IR             Infrared

  IR             Interim Release

  IR&D           Independent Research And Development

  IR-RAD         Infrared Radiometer

  Ir1            Interim Release 1 (Use Ir-1 For EDHS Search)

  IRAD           Independent Research And Development

  IRC            Internet Relay Chat

  IRCD           Interface Requirements Control Document

  IRD            Interface Requirements Document

  IRE            Institute For Radio-Engineering And Electronics

  IRE            Instrument Readiness Exercise

  IRE-RAS        Institute Of Radio Engineering - Russian Academy Of
                 Science

  IRI            International Research Institute

  IRIG           Inter-Range Instrumentation Group

  IRIG-B         Inter-Range Instrumentation Group B

  IRIS           Italian Research Interim Stage

  IRIS           Incorporated Research Institutions For Seismology

  IRIX           Operating System Name For The SGI.  IRIX 6.2 Is The
                 Current Baseline Version For The Pre-Release B Testbed

  IRM            Information Resources Management

  IRN            Interface Revision Notice

  IRP            Instrument Resource Profile

  IRR            Integrated Requirements Review

  IRR            Imaging Infrared Radiometer

  IRR            Incremental Release Review

  IRRR           Interim Release Readiness Review

  IRS            Interface Requirements Specification

  IRS            India Resource Satellite

  IRS            Information Retrieval Service (ESA)

  IRT            Infrared Thermal

  IRTS           Infrared Temperature Sounder

  IRU            Inertial Reference Unit

  IRV            Improved Inter-Range Vector Message

  IS             Ingest Subsystem

  IS             Intermediate Schedule

  IS             Information System

  IS             Integrated Simulations

  IS             Instrument Support

  IS-IS          Intermediate System To Intermediate System

  ISA            Industry Standard Architecture

  ISA            Integrated Services Architecture

  ISAKMP         Internet Secure Association Key Management Protocol

  ISAM           Indexed Sequential Access Method

  ISAMS          Improved Stratospheric And Mesospheric Sounder

  ISAPI          Internet Server Api

  ISAR           Instrument Support Activity Request

  ISAS           Institute Of Space And Astronautical Science (Japan)

  ISATS          Integrated Spacecraft Automated Test System

  ISBN           International Standard Book Number

  ISC            Information Systems Center

  ISC            Instrument Support Controller

  ISC            Instrument Support Controller/Current-Short Circuit
                 (ISC)

  ISCAT          Investigation Of Sulfur Chemistry In The Antarctic
                 Troposphere

  ISCCP          International Satellite Cloud Climatology Project

  ISDN           Integrated Systems Digital Network

  ISDS           Inadvertent Separation Destruct System

  ISEE           International Sun/Earth Explorer

  ISF            Instrument Support Facility

  ISFSW          Instrument Support Facility Software

  ISH            Information Super Highway

  ISI            Inter-Disciplinary Science Investigation

  ISI            Interim Support Instruction

  ISI            Integral Systems Incorporated

  ISI            \"Integral System, Incorporated\"

  ISIM           Instrument Simulator

  ISIO           Instrument Serial I/O (An Electronic Slice)

  ISIPS          ICEsat Science Investigator-Led Processing System

  ISIR           Infrared Spectral Imaging Radiometer

  ISIS           Inflatable Sunshield In Space

  ISIS           Integrated Systems Kit For The Macintosh

  ISLE           Individual Single Loss Expectancy

  ISLSCP         International Satellite Land Surface Climatology Project

  ISM            Instrument Systems Manager

  ISN            Intersegment Network

  ISO            International Standards Organization

  ISOC           Integrated Science Operations Center

  ISOC           Internet Society

  ISOLAN         Isolated Local Area Network

  ISP            Integrated Support Plan

  ISP            Integerized Sinusoidal Projection

  ISP            Internet Service Provider

  ISPF           Interactive System Productivity Facility

  ISQL           Interactive SQL

  ISR            Individual Schedule Request

  ISR            Input Schedule Request

  ISR            Instrument Support Room

  ISRC           Current Source

  ISS            Internetworking Subsystem (CSMS)

  ISS            Internet Scanner Safesuite

  ISSA           International Space Station Alpha

  ISSN           International Standard Serial Number

  IST            Instrument Support Toolkit

  IST            Instrument Support Terminal (ECS)

  IST            Integrated System Test

  IST            Ice Surface Temperature

  IST            Instrument Support Terminal

  IST            Instrument Star Tracker

  IST-US         Instrument Support Terminal - United States (At JPL)

  ISTOK-1        Infrared Spectroradiometer On Mir

  ISTP           International Solar And Terrestrial Physics

  ISTS           Institute For Space And Terrestrial Science

  ISU            Intermediate Storage Unit

  ISY            International Space Year (1992)

  IT             Instrument Team

  IT             Intelligent Terminal

  IT             Integer Data Type (16 Bit)

  IT             Information Technology

  IT&L           Integration Test And Launch

  IT&V           Integration, Test, And Verification

  IT&V           \"Integration, Test and Validation\"

  ITAR           International Traffic in Arms Regulation

  ITCZ           Intertropical Convergence Zone

  ITE            I&T test Engineer

  ITFB           Information Technology  Federation Board

  ITG            Internet Telephony Gateway

  ITIR           Intermediate Thermal Infrared Radiometer

  ITMM           Integrated Thermal Math Model

  ITO            Independent Test Organization

  ITO            Information Technology Outsourcing

  ITP            Interface Test Program

  ITP            Integrated Test Plan

  ITR            Information Technology Resources

  ITRF           International Terrestrial Reference Frame

  ITS            Intelligent Terminal Segment (NCC)

  ITSD           Information Technology And Services Division

  ITSEC          Information Technology Security Evaluation And
                 Certification

  ITSO           Information Technology Security Officer

  ITSS           Information Technology & Support Services (Raytheon)

  ITT            Integration Test Team

  ITTP           International Tovs Processing Package

  ITV            Integration, Test, And Verification

  ITV            Interactive Television

  ITVF           Integrated Test And Verification Facility

  IU             Interface Unit

  IUS            Inertial Upper Stage

  IUS            Informix Universal Server

  IV&V           Independent Verification and Validation

  IVICS          Interactive Visualizer and Image Classifier for
                 Satellites

  IVIS           Interactive Video Information System

  IVS            Interactive Videodisk System

  IVVF           Independent Verification And Validation Facility

  IVVF           Integration Verification and Validation Facility

  IWC            Ice Water Content

  IWG            Investigator Working Group

  IWGDMGC        Investigators Working Group On Data Management For
                 Global Change

  IWP            Ice Water Path

  IXC            Interexchange Carrier

  JANET          Joint Academic Network

  JAROS          Japan Resources Observation System \[Organization\]

  JAXA           Japan Aerospace Exploration Agency

  JCET           Joint Center For Earth Systems Technology

  JD             Julian Day

  JD             Julian Date

  JDT            Java Dar Tool

  JEA            Japan Environmental Agency

  JEB            Java Earth Browser

  JEM            Japanese Experiment Module

  JEM            Joint End-to-End Mission

  JEOC           Japanese Earth Observing Center

  JEOS           Japanese Earth Observing System

  JERS           Japanese Earth Resources Satellite

  JERS-OPS       Japanese Earth Remote-Sensing Satellite-Ops

  JEST           Java Earth Science Tool

  JEXAM          Japanese Experiment Of Asian Monsoon

  JGI            Japex Geoscience Institute

  JGOFS          Joint Global Ocean Flux Study

  JICC           Japanese Instrument Control Center

  JIPS           Janet Internet Protocol Service

  JMA            Japan Meteorological Association

  JMR            Jason Microwave Imager

  JNC            Jet Navigational Charts

  JODC           Japan Ocean Data Center

  JORNEX         Jornada Experiment

  JOST           Joint OMI Science Team

  JPEG           Joint Photographic Experts Group

  JPIP           Joint Project Implementation Plan

  JPL            Jet Propulsion Laboratory

  JPL            Jet Propulsion Laboratory (DAAC)

  JPLAIRSAR      JPL Airborne Synthetic Aperture Radar

  JPO            Joint Planning Office

  JPOCC          Japanese Payload Operations Control Center

  JPOP           Japanese Polar Orbiting Platform

  JRC            Joint Research Center (Italy)

  JRC            Joint Research Council

  JSC            Johnson  Space Center

  JSC            Joint Scientific Committee

  JSDAC          Japanese Science Data Analysis Center

  JSDIS          Japanese Science Data And Information System

  JSOCC          Japanese Science Operations Control Center

  JTM            Job Transfer And Manipulation

  Ka-band        the portion of the electromagnetic spectrum ranging from
                 18 to 40 GHz

  KB             Kilobyte (10\*\*3)

  Kb             Kilobit (10\*\*3)

  Kb/s           Kilobits/Second

  KB/SEC         Kilobyte Per Second

  KBps           Kilobytes Per Second

  Kbps           Kilobits Per Second

  KCD            KSC Center Director

  KDAU           Ku-Band Decryption Authentication Unit

  Kerberos       Security Protocol Developed By MIT; Base For DCE
                 Security

  KFTP           Kerberos File Transfer Protocol

  KI             Constant Current (charge mode)

  KIIT           Key Interfaces Integration And Test

  KINEROS        Kinematic Wave Overland Flow, Channel Routing And
                 Erosion Model

  KLM SDS        Kongsberg Lockheed Martin/Space Data Services

  KLOC           Kilolines (10\*\*3) Of Code

  km             Kilometer

  KM             Kinematic Mount

  KM             Key Mechanism

  KNMI           Royal Netherlands Meteorological Institute

  KOMPSAT        Korea Multipurpose Satellite

  KONS           (SPS File)

  KORMEX         Korean Monsoon Experiment

  KPM            KSC ELV Program Manager

  KSA            KSC Senior Advisor

  KSA            Ku-Band Single Access

  KSAF           K-Band Single Access Forward (Service)

  KSAM           Ku Band Single Access Modulator

  KSAR           K-Band Single Access Return (Service)

  KSC            Kennedy Space Center

  KSLOC          Thousand Source Lines Of Code

  ktelnet        Kerberos Telnet

  Ku-band        portion of the electromagnetic spectrum ranging from 11
                 to 18 GHz

  KUJ            Kumomoto, Japan Station Id

  KWord          Kilowords Of Memory (1kword = 2  10 Words)

  L              Launch

  L&A            Launch And Activation

  L&A            Launch And Ascent

  L&EO           Launch And Early Orbit

  L&EO           Launch And Evaluation Operation

  L&EO           Launch And Early Operations

  L&EOOMP        Launch And Early Orbit Operations Management Plan

  L+             Launch Plus

  L-             Launch Minus

  L-7            Landsat-7

  L-R            Low Rate

  L/A            Launch and Ascent

  L/T            Long Term

  L/V            Launch Vehicle

  L0             Level Zero

  L0             Level 0

  L0-L4          Level 0 (Zero) Through Level 4

  L0R            Level 0 Release

  L0R            Level 0 Reformatted

  L0R            Landsat Reformatted Data

  L1             Level One (Processing)

  L1G            Level 1G Data Product

  L1G            Level 1 Geometrically Corrected

  L1R            Level 1R Data Product

  L1R            Level 1 Radiometrically Corrected

  L1R/G          Level 1R And Level 1G Data Products

  L4             Level 4

  L7             Landsat 7

  LA             Laser Altimeter

  LA             Launch Of EOS Terra (AM-1) Payload

  LAC            Local Area Coverage (AVHRR)

  LaDAAC         Langley Distributed Active Archive Center

  LAGEOS         Laser Geodynamics Satellite

  LAI            Leaf Area Index

  LALT           Laser Altimetry

  LAM            Laser Altimetry Mission

  LAN            Local Area Network

  Landsat        Land Remote-Sensing Satellite

  LANE           Local Area Network Emulation

  LANL           Los Alamos National Laboratory

  LaRC           Langley Research Center (now ASDC)

  LaRC           Langley Research Center

  LaRCNET        Langley Research Center Network

  LAS            Land Analysis System

  LASA           Laser Atmospheric Sounder And Altimeter

  LASAL          Large Aperture Scanning Airborne Lidar

  LASE           Lidar Atmosphere Sensing Experiment

  laser          Light Amplification By Stimulated Emission Of Radiation

  LASP           Laboratory For Atmospheres And Space Physics (University
                 Of Colorado)

  LASP           Laboratory For Atmospheric Studies Project

  LAT            Latitude

  LATI           Landsat Advanced Technology Instrument

  LATIS          LaRC TRMM Information System

  LaTIS          Langley TRMM Information System

  LAWS           Laser Atmospheric Wind Sounder

  LBA            Large Scale Biosphere-Atmosphere Experiment In Amazonia

  LBX            Low Bandwidth X

  LC             Launch Complex

  LC             Launch Critical

  LCC            Launch Control Center

  LCC            Lambert Conformal Conic

  LCD            Liquid Crystal Display

  LCFS-PR        Last Come, First Served With Preemptive Resume

  LCN            Logistics Control Number

  LCP            Left Circular Polarized

  LCU            Library Control Unit

  LDAAC          Langley DAAC

  LDAAC          LaRC Distributive Active Archive Center

  LDAP           Lightweight Directory Access Protocol

  LDAS           Local Data Access System

  LDB            Long Duration Balloon

  LDBP           Long Duration Balloon Program

  LDCM           Landsat Data Continuity Mission

  LDEF           Long Duration Exposure Facility

  LDEO           Lamont-Doherty Earth Observatory (Columbia University)

  LDOPE          Land Data Operational Product Evaluation

  LDOS           Landsat Data And Operations System

  LDS            Level Discrete Set

  LDTS           LPS Data Transfer Subsystem

  LEA            Log Export Api

  LEC            Local Exchange Carrier

  LEC            Lan Emulation Client

  LECS           Local Area Network Emulation Configuration Server

  LED            Low Energy Detector

  LED            Light Emitting Diode

  LEFI           Local Electric Field Instrument

  LEL            Lower Explosive Limit

  LEM            Lower Equipment Module

  LEO            Low Earth Orbit

  LEO            Launch and Early Orbit

  LEOP           Launch And Early Orbit Phase

  LeRC           Lewis Research Center

  LERTS          Laboratoire d'Etudes Et De Recherches En Tele Detection

  LES            Local Area Network Emulation Server

  LET            Linear Energy Transfer

  Level0         Reconstructed, unprocessed instrument/payload data at
                 full resolution with any and all communications
                 artifacts removed

  Level1A        Reconstructed, unprocessed instrument data at full
                 resolution, time-referenced, and annotated with
                 ancillary information

  Level1B        Level 1A data that have been processed to sensor units

  Level2         Derived geophysical variables at the same resolution and
                 location as the Level 1 source data

  Level3         Variables mapped on uniform space-time grid scales,
                 usually with some completeness and consistency

  Level4         Model output or results from analyses of lower level
                 data

  LE_ARP         Local Area Network Emulation Address Resolution Protocol

  LF             Long Floating Point Data Type (64 Bit)

  LFC            Large Format Camera

  LFM            Local Fault Manager

  LFS            Local File System

  LG             Load Generation

  LGA            Low Gain Antenna

  LGN            Landsat Ground Network

  LGS            Landsat Ground System

  LHC            Left-Hand Circular

  LHCP           Left Hand Circular (Ly) Polarized

  LHH            L-Band Hh

  LHP            Loop Heat Pipe

  LI             Local Interface

  LI             Long Integer Data Type (32 Bit)

  LIBI/O         Library Input/Output

  LID            Last(Est) Instrument Delivery

  LIDAR          Light Detection And Ranging Instrument

  LIDQA          Landsat Image Data Quality And Analysis

  LIGHTSAR       Lightweight Synthetic Aperture Radar

  LIM            Local Information Manager

  LIMGR          Local Information Manager

  LIMS           Limb Infrared Monitor Of The Stratosphere

  LINPAC         Linpack (Linear Algebra Package)

  LIRIS          Loaral Infrared Imaging Systems

  LIS            Lightning Imaging Sensor

  LISN           Line Impedance Stabilization Network

  LISP           List Processing (Computer Programming Language)

  LISS           Linear/Imaging Self Scanner Sensor

  LITE           Lidar In-Space Technology Experiment

  LLC            Logical Link Control

  LLC/SNAP       Logical Link Control/Subnetwork Access Protocol

  LLHP           Laser Loop Heat Pipe

  LLIS           Lessons Learned Information System

  LLNL           Lawrence Livermore National Laboratory

  LMC            Length Modulation Cell

  LMCS           Local Multipoint Communications Services

  LMD            Laboratoire De Meteorologie Dynamique

  LMD/ARA        Laboratoire De Meteorologie Dynamique/Atmospheric
                 Radiation Analysis Group

  LMDS           Local Multipoint Distribution Services

  LMI            Lower Equipment Module Interface Unit

  LMI            Local Management Interface

  LMOC           LandSat 7 MOC

  LMP            Launch Management Plan

  LMS            Logistics Management Support

  LMS            Logistics Management System

  LNA            Low-Noise Amplifier

  LO             Local Oscillator

  LOA            Letter Of Agreement

  LOB            Launch Operations Building

  LOB            Line Of Balance

  LOC            Lines Of Code

  LOC            Loss Of Cell Delineation

  LOC/mm         Lines Of Code Per Man Month

  LOCC           Launch Operations Control Center

  LOE            Level Of Effort

  LOF            Local Oscillator Frequency

  LOGSWG         Landsat Operations Ground Segment Working Group

  LOICZ          Land Ocean Interactions In The Coastal Zone

  LOM            Logical Object Model

  LON            Longitude

  LORA           Level Of Repair Analysis

  LORE           Limb Ozone Retrieval Experiment

  LOS            Line Of Sight

  LOS            Loss Of Signal

  LOWTRAN        USAF-GRL Atmosphere Radioactive Transfer Model

  LP             Langmuir Probe

  LP             Land Processes (DAAC)

  LPC            Load Power Conditioner

  LPCE           Low Power Control Electronics (Or Just PCE)

  LPDAAC         Land Processes DAAC

  LPDS           Level 1 Product Distribution System

  LPF            Low Pass Filter

  LPGS           Landsat Product Generation System (Level 1 Product
                 Generation System for Landsat 7)

  LPM            Landsat Program Management

  LPO            Landsat Project Office

  LPS            Landsat 7 Processing System

  LPT            Limited Performance Test

  LR             Laser Retroreflector

  LR             Low Rate

  LRA            Laser Retroreflector Array

  LRAT           Launch Readiness Acceptance Test

  LRC            Low Rate Channel

  LRC            Langley Research Center

  LRD            Launch Readiness Date

  LRD            Low Rate (S-Band) Data

  LRDPS          Low Rate Data Processing System

  LRDS           Launch Readiness Date

  LRDS           Low Rate Data Switch

  LRIR           Limb Radiance Inversion Radiometer

  LRP            Launch Reentry Processor

  LRPT           Low-Resolution Picture Transmission

  LRR            Launch Readiness Review

  LRRD           Low-Rate Real-Time Data

  LRRL           Low Rate Return Link

  LRS            Low-Rate System

  LRS            Low-Rate Science

  LRS            Laser Reference System

  LRSP           Low Rate Service Processor

  LRU            Line Replaceable Unit

  LRU            Lowest Replaceable Unit

  LRV            Last Recorded Value

  LRV            Last Reported Value

  LS             Lower-Stratosphere

  LSA            Logistics Support Analysis

  LSAR           Logistics Support Analysis Record

  LSB            Launch Services Building

  LSB            Least Significant Bit

  LSC            Line Sync Code

  LSD            Launch Status Display

  LSD            Logistics Support Depoy

  LSD            Least Significant Digit

  LSE            Launch Site Equipment

  LSE            Land-Surface Emissivity

  LSE            Launch Support Equipment

  LSH            Least Significant Half

  LSIO           Low Speed Serial Input/Output

  LSM            Local System Management

  LSM            LAWS System Model

  LSM            Local System Manager

  LSM            Land-Surface Model

  LSO            Logistics Support Office

  LSP            Land-Surface Parameterizations

  LSPIM          Land Surface Processes Mission

  LSPIM          Land Surface Processes And Interactions Mission

  LSR            Launch Support Room

  LSRR           Location Server/Request Router

  LSSM           Launch Site Support Manager

  LSSP           Launch Services Support Plan

  LST            Land Surface Temperature

  LST            Local Satellite Time

  LSW            Least Significant Word

  LTA            Long Term Archive

  LTAS           Launch Trajectory Ascent System

  LTC            Long Term Calendar

  LTER           Long-Term Ecological Research

  LTIP           Long-Term Instrument Plan

  LTM            Log Transfer Managers

  LTOP           Long-Term Operating Plan

  LTP            Long Term Plan

  LTSOP          Long-Term Spacecraft Ops Plan

  LTSP           Long-Term Science Plan

  LTWG           Landsat Technical Working Group

  LUCF           Land Use Change Forestry

  LUT            Lookup Table

  LUT            Look-Up Table

  LV             Launch Vehicle

  LV             Launch Version

  LVA            Local Vertical Acquisition

  LVD            Launch Vehicle Director

  LVDC           Launch Vehicle Data Center

  LVDT           Linear Variable Differential Transducer

  LVI            Launch Vehicl Interface

  LVLH           Local Vertical-Local Horizontal

  LVLH           \"Local Vertical, Local Horizontal\"

  LVO            Label Value Object

  LVS            Launch Vehicle System

  LVS            Launch Vehicle Simulator

  LW             Long Wave

  LWC            Liquid Water Content

  LWIR           Long-Wave Infrared

  LWM            Low Water Mark

  LWP            Liquid Water Path

  LZ77           Lampel-Ziv Coding

  LZAARDS        Level Zero Archive And Retrievable Data System

  LZDP           Level Zero Data Processing

  LZP            Level Zero Processing

  LZPF           Level Zero Processing Facility

  LZPF           Level Zero Processing Facility (EDOS component)

  LZPS           Level Zero Processing System

  LZW            Lempel-Ziv-Welch Compression Algorithm

  M              Million, Mega (Prefix)

  m              Meter

  M&D            Micrometeoroid And Space Debris

  M&DOD          Mission And Data Operations Directorate

  M&O            Maintenance And Operations

  M&S            management and status \[data\]

  M&SS           Mission And Simulation Software

  M-POP          Metadata Population

  M/M/m          Kendall Notation For A Type Of Queue

  M1             The TRW Facility For EOS PM-1 Environmental Testing

  MA             Multiple Access

  MAAT           Mean Annual Air Temperatures

  MAB            Mission Applications Branch

  MAC            Medium Access Control

  MAC            Message Authentication  Code

  MAC            Multi-Aircraft Campaign

  MAC            Multi-Sensor Air Campaign

  MACAWS         Multiagency Airborne Coherent Atmospheric Wind Soundier

  MAESA          Measurements For Assessing The Effects Of Stratospheric
                 Aircraft

  MAF            Multiple Access Forward

  MAG            Magnetospheric Currents And Fields Detector

  MAGE           Mechanical Aerospace Ground Equipment

  MAGS           Mackenzie GEWEX Study

  MAGSAT         Magnetometer Satellite

  MAHLOVS        Middle And High Latitudes Oceanic Variability Study

  MAHRSI         Middle Atmosphere High Resolution Spectrograph
                 Investigation

  MAI            Machine Aided Indexing

  MAINT          Maintenance

  MAIT           Manufacturing, Assembly, Integration And Test

  MAM            Mirror Attenuator Mosaic

  MAN            Metropolitan Area Network

  MAOS           Multiapplication Operating System

  MAP            Multiplexer Access Point

  MAP            Microwave Anisotrophy Probe

  MAPI           Messaging API

  MAPS           Measurement Of Air Pollution From Satellites

  MAPS           Millions Of Actions Per Second

  MAR            Multiple Access Return

  MAR            Mission Analysis Room

  MARC           Machine Readable Cataloging

  MAS            Millimeter-Wave Atmospheric Sounder

  MAS            MODIS Airborne Simulator

  MASEX          Mass Air Sea Transfer Experiment

  MASTER         MODIS/ASTER Airborne Simulator

  MAT            Mission Analysis Tool

  MAT            Mopitt Activation Timeline

  MATCALS        Marine's Air Traffic Control And Landing System

  MATHML         Mathematical Markup Language (Based On XML Syntax, W3C)

  MATR           Mopitt Airborne Test Radiometer

  MAWP           Maximum Actual Working Pressure

  MaxTTRS        Maximum Time To Restore Service

  MB             Megabyte (10\*\*6)

  Mb             Megabit (10\*\*6)

  MB             Mega Byte

  Mbit/s         Megabits Per Second

  MBLA           Multi-Beam Laser Altimeter

  MBONE          Multicast Backbone

  MBps           Million Of Bytes Per Second

  Mbps           Million Of Bits Per Second

  Mbps           Megabits per second

  Mbyte          Megabyte

  MC             Master Clock

  MC             Mission Critical

  MC             Mission Controller

  MC             Mechanism Controller

  MC             Memory Controller

  MCC            Mission Control Center

  MCE            Miniature Embedded Converter

  MCF            Metadata Configuration File

  MCF            Metadata Control File

  MCF            Meta Content Framework (Data Model For Metadata)

  McIDAS         Man-Computer Interactive Data Access System

  MCL            Master Command Load

  MCNS           Multimedia Cable Network System

  MCP            Meteorological Communications Package

  MCP            Master Clock Period

  MCR            Mission Control Room

  MCR            Minimum Cell Rate

  MCS            Multicast Service

  MCS            Monitor And Control Subsystem

  MCS            Mesoscale Convective Systems

  MCSST          Multi-Channel Sea Surface Tempertature

  MCST           MODIS Characterization Support Team

  MCT            Monitoring And Control Tools

  MD             Master Directory

  MD             Maintainability Demonstration

  MD             Mission Director

  MD             Maryland

  MDA            Mechanisms Drive Assembly

  MDBMS          Multidimensional DBMS

  MDBS           Mobile Database Station

  MDC            Mission Director's Center

  MDD            Mission Description Document

  MDF            Memory Dump Flag

  MDI            Mechanical Design Integration

  MDI            Michelson-Doppler Image

  MDIS           Metadata Interchange Specification

  MDM            Multiplexer/Demultiplexer

  MDP            Multiplexing Data Processor (High Rate)

  MDR            Mission Design Review

  MDSDS          Mass Data Storage And Delivery System

  MDT            Mean Downtime

  MDU            Missing Data Unit

  MDUE           Missing Data Unit Entry

  MDUL           Missing Data Unit List

  MDW            Metadata Works

  ME             Message Error

  ME             Mission Essential

  MEBS           MODIS Emergency Backup System

  MEC            Miniature Embedded Converter

  MECO           Main Engine Cut-Off

  MEDS           Multidisciplinary Engineering Development Services

  MEICD          MOC External Interfaces ICD

  MEL            Multos Executable Language

  MELV           Medium Expendable Launch Vehicle

  MEM            Memory Management

  MEM            Main Electronics Module (MODIS)

  MEO            Middle Earth Orbit (Satellite)

  MEOP           Maximum Expected Operating Pressure

  MEPA           Medium Energy Particle Analyzer

  MEPED          Medium Energy Proton And Electron Detector

  MERIS          Medium-Resolution Imaging Spectrometer (ESA)

  MES            Main Engine Start

  MESSR          Multispectrum Electronic Self-Scanning Radiometer

  MET            Metadata

  MET            Mission Elapsed Time

  MET            Metadata Access (Toolkit)

  Metadata       Data About Data

  Metadata       Machine-Understandable Information About Data

  METEOR 3M-1    Russian Operational Weather Satellite

  METEOSAT       Geosynchronous Meteorology Satellite (ESA)

  METI           Ministry Of Economy Trade And Industry (Formerly Known
                 As MITI)

  METOP          Meteorological Operational Weather Satellite

  METRI          Meteorological Research Institute (Korea)

  METSAT         Meteorological Satellite

  METSOAT        European Weather Satellite

  MEU            Main Electronics Unit

  MEVDP          Modified Element Volume Dose Program

  MFD            Master File Directory

  MFE            Magnetic Field Explorer

  MFLO           Millions Of Floating Point Instructions

  MFLOP          Million Floating Point Operations Per Second

  MFLOPS         Mega (Millions Of) Floating-Point Operations (10\*\*6)
                 Per Second

  MFOP           Major Facilities Operations Plan

  MFPS           Major Frame Processing System

  MFR            Multilink Frame Relay

  MGA            Medium Gain Antenna

  MGDR           Merged Geophysical Data Record

  mgmt           Management

  MGS            Mars Global Surveyor

  MGS            Mcmurdo Ground Station, Antarctica

  MGSE           Mechanical Ground Support Equipment

  MGT            Management

  MH             Message Handler

  MHCI           Management Hardware CI

  MHS            Microwave Humidity Sounder

  MHW            Mean High Water

  MHWCI          Management Hardware Configuration Item

  MHz            Megahertz

  MHz            Mega Hertz

  MI             Master Index

  MIB            Management Information Base

  MIC            Media Interface Connector

  MIC            Memory Interface Controller

  MICD           Interface Control Drawing, Mechanical

  MID            Mechanical Interface Drawing

  MIDAS          Mobile Agents For Intelligent Data Acquisition Systems

  MIDI           Musical Instrument Digital Interface

  MIDL           Microsoft Interface Definition Language

  MIL            Military

  MIL            MIL Standard Electronics

  MIL            Merritt Island (Ground Network) Station

  MIL-HDBK       Military Handbook

  MIL-STD        Military Standard

  MILSTAR        Military Strategic And Tactical Relay

  MIM            Mission Integration Manager

  MIMD           Multiple Instructions, Multiple Data

  MIME           Multipurpose Internet Mail Extension

  MIMR           Multifrequency Imaging Microwave Radiometer

  MIO            Multiple Input-Output

  MIP            Mission Implementation Plan

  MIP            Mandatory Inspection Point

  MIPAS          Michelson Interferometric Passive Atmospheric Sounding
                 (ESA)

  MIPR           Multi-Interagency Procurement Request

  MIPS           Mega (Millions Of) Instructions (10\*\*6) Per Second

  MIRAS          Mir Infrared Atmospheric Sounder

  MIRIAM/DOPI    Mir Infrared Atmospheric Measurements/Double Pendulum
                 Interferometer

  MIRR           Material Inspection And Receiving Report

  MIS            Management Information System

  MISR           Multi-Angle Imaging Spectro-Radiometer

  MISR           Multi-angle Imaging Spectro Radiometer

  MIT            MOC Implementation Team

  MIT            Massachusetts Institute Of Technology

  MITC           MO&DSD Interface Capability

  MITC/EITC      Mo&Dsd Interface Capability/Egs Interface Test
                 Capability

  MITI           Ministry Of International Trade And Industry (Japan)

  MIU            Mission Interface Unit

  MIZEX          Marginal Ice Zone Experiment

  ML             Memory Load

  MLA            Multispectral Linear Array

  MLCI           Management Logistics Configuration Item

  MLCI           Management Lofistics Software CI

  MLE            Maximum Likelihood Estimation

  MLELV          Medium-Lite Expendable Launch Vehicle

  MLI            Multi-Layer Insulation

  MLI            Machine Language Instruction

  MLR            Multilinear Recording

  MLS            Microwave Limb Sounder

  MLT            Mean Local Time

  MM             Minutes, Two Digit Format

  MM             Momentum Management

  MM             Mode Management

  MM             Mission Management

  MM             Mesoscale Model

  MM             Mission Manager

  mm/hr          Millimeters Per Hour

  MMA            Mission Management Area

  MMD            Mean Mission Duration

  MMDPS          Multi-Mission Display Processing System

  MMDS           Multichannel, Multipoint Distribution Service

  MMFD           Multi-Mission Flight Dynamics

  MMH            Monomethyl Hydrazine

  MMI            Man-Machine Interface

  MMIC           Monolithic Microwave Iontegrated Circuit

  MMO            Mission Management Office

  MMPA           Marine Mammal Protection Act

  MMPP           Materials, Mechanical Parts And Processes

  MMR            Modular Multi-Band Radiometer

  MMS            Multimission Modular Spacecraft

  MMS            Mode Management Service

  MMS            Modular Modeling System

  MMS            Master Mission Schedule

  MMS            Mission Management Subsystem

  MMS            Mission Management System

  MMS            Multi-Mission Scheduler

  MMS            Mission Management System (EMOS component)

  MNG            Multiple-Image Network Graphics (Proposed Addition To
                 PNG Standard For Storing

  MNG            And Transmitting Multiple Image Animations And Composite
                 Frames)

  MO             Mission Of Opportunity

  MO&DA          Mission Operations And Data Analysis

  MO&DSD         Mission Operations And Data Systems Directorate (GSFC
                 Code 500)

  MOA            Memorandum Of Agreement

  MOA            Meteorology, Ozone, And Aerosol

  MOBY           Marine Optical Buoy

  MOC            Mission Operations Center

  MOC            Mission Operations Control

  MOC            Manaement And Operations Components

  MOCD           Magneto-Optics Compact Disk (Write Many CD)

  MOCD           Mission Operations Concept Document

  MOCE           Marine Optical Characterization Experiment

  MOCEAN         MODIS Ocean

  MOD            MDC Operations Director

  MODAPS         MODIS Adaptive Processing System

  MODIS          Moderate Resolution Imaging Spectroradiometer

  MODIS          Moderate-Resolution Imaging Spectroradiometer

  MODIS-N        Moderate Resolution Imaging Spectroradiometer - Nadir

  MODIS-T        Moderate Resolution Imaging Spectroradiometer - Tilt

  MODLAND        MODIS Land

  MODNET         Mo&Dsd Operational Development Network

  MODS           Mission Operations And Data Systems

  MODTRAN        Moderate Resolution Transmittance

  MOE            Maneuver Operations Exercise

  MOE            Mission Operations Exercise

  MOI            Memorandum Of Information

  MOJO           Message Oriented Java Objects

  MOJO           Message Oriented Jest Objects

  MOL            Manned Orbital Laboratory

  MOLAP          Multidimensional OLAP

  MOLFLUX        A Routine For Determining Contamination Deposition Rates
                 On To EOS Surfaces Usingdata from RTHETO

  MOM            Mission Operations Manager

  MOM            Message-Oriented Middleware

  MOMP           Mission Operations Management Plan

  MON            Monitor

  MOO            Maintain And Operation

  MOP            Mission Operations Plan

  MOP            Meteosat Operational Programme

  MOPITT         Measurements Of Pollution In The Troposphere

  MOPITT         Measurement Of Pollution In The Troposphere

  MOPR           Mission Operations Planning Review

  MOPS           Mega (Millions Of) Operations (10\*\*6) Per Second

  MOR            Mission Operations Review

  MOR            Mission Operations Room

  MOR-1          Mission Operations Room -1

  MOR-2          Mission Operations Room -2

  MORD           Mission Operations Requirements Document

  MOS            Marine Observation Satellite

  MOS            Metal Oxide Silicon

  MOS-1a,b       Marine Observation Satellite (Japan)

  MOSA           Mission Operations Support Area

  MOSDD          Mission Operations And Systems Development Division

  MOSFET         Metal Oxide Silicon Field Effect Transistor

  MOSP           Mission Operations Support Plan

  MOSPF          Multicast Open Shortest Path First

  MOSR           Mission Operations Status Review

  MOSS           Mime Object Security Standard

  MOSS           Mission Operations and Science System

  MOSS           Mission Operations Science System

  MOST           Mission Operations Support Test

  MOTS           Modified-Off-The-Shelf

  MOU            Memoranda Of Understanding

  MOU            Memorandum of Understanding

  MOU            Memorandum Of Understandings

  MOWG           Mission Operations Working Group

  MOZART         Model For Ozone And Related Chemical Tracers

  MP             Mission Planning

  MP             Microprocessor

  MP             Message Passing

  MP             Massively Parallel

  MPA            Mission Planning Analyst

  MPD            Magnetosphere Particules (Detector)

  MPDU           Multiplexed Protocol Data Unit

  MPDU           Multiplexing Daa Unit

  MPE            Max-Planck Institute For Extraterrestrial Physics

  MPEG           Moving Pictures Expert Group (International Video
                 Compression Standard)

  MPF            Managed Process Framework

  MPG            Max Planck Gesellschaft (Max Planck Society)

  MPGT           Mission Planning Graphics Tool

  MPI            Max Planck Insititute

  MPP            Massively Parallel Processor

  MPR            Monthly Progress Review

  MPR            Mission Planning Review

  MPS            Multimode Portable Simulator

  MPS            Master Power Supply

  MPS            Mission Planning System (ASF)

  MPT            Mission Planning Terminal

  MPU            Metadata Populating Utility (LaRC)

  MR             Malfunction Report

  MR             Microwave Radiometer

  MR             Moon Rise

  MR             Mission Rehearsal

  MRB            Material Review Board

  MRC            Master Reference Cube

  MRD            Mission Rehearsal Director

  MRDB           Mission Requirements Database

  MRE            Mission Readiness Exercise

  MRE-1          Mono-Propellant Rocket Engine

  MRIR           Medium Resolution Infrared Radiometer (Nimbus)

  MRLC           Mulit-Resolution Land Characteristics Consortium

  MRM            Mission Readiness Manager

  MRO            Memory Read Out

  MRR            Manufacturing Readiness Review

  MRR            Mission Requirement Request

  MRS            Maintenance Reporting System

  MRS            Malfunction/Failure Reports

  MRS            Mission Requirements Specification

  MRS            Multi Release Support

  MRT            Mission Readiness Test

  MRT            Mission Readiness Team

  MRTP           Mission Readiness Test Plan

  MRTR           Mission Readiness Test Requirements

  MRTT           Mission Readiness Test Team

  MS             Moon Set

  MS             Mass Storage

  ms             millisecond

  MS PCMB        Mission Systems PCMB

  MSB            Most Significant Bit

  MSC            Multimedia Supper Corridor

  MSCD           Mirror Scan Correction Data

  MSCIF          Mechanical S/C I/F

  MSD            LPS File Extension For \"MSCD\"

  MSE            Maintenance Support Equipment

  MSFC           Marshall Space Flight Center (DAAC)

  MSG            Meteosat Second Generation

  MSGF           Station Status Info

  MSGM           HDDT Shipment Report

  MSH            Most Significant Half

  MSK            Receive Antenna Horizon Mask Message

  MSL            Mean Sea Level

  MSO            Manufacturing Shop Order

  MSO            Mission Systems Office

  MSOCC          Multiple Satellite Operations Control Center

  MSPO           Mission Systems Program Office

  MSPPS          Microwave Surface And Precipitation Products

  MSPSP          Mission System Prelaunch Safety Package

  MSR            Management Status Report \[Flights Projects
                 Directorate\]

  MSR            Monthly Status Review

  MSR            Mission Status Review

  MSR            Microwave Scanning Radiometer

  MSR            Mission Support Room

  MSRD           Mission Specific Requirements Document

  MSRM           Mass Storage Reference Model

  MSS            Multi-Spectral Scanner (Landsat)

  MSS            Mass Storage System

  MSS            Management Subsystem

  MSS            Master Summary Schedule

  MSS            Message Switching System

  MSS            Systems Management Subsystem

  MSS            Management Services Subsystem

  MSS            Mobile Satellite Service

  MSS            Mission Management System

  MSSHW          Mss Hardware Ci

  MST            MODIS Science Team

  MST/MDT        Mountain Standard Time (or Daylight Time)

  MSU            Mass Storage Unit

  MSU            Microwave Sounding Unit

  MSW            Most Significant Word

  MSX            Midcourse Space Experiment

  MT             Magnetic Torquer

  MT             Mission Test

  MTA            Message Transfer Agent

  MTA            Magnetic Torque Assembly

  MTA            Metadata

  MTA            LPS File Extension For "Metadata"

  MTBCM          Mean Time Between Corrective Maintenance

  MTBF           Mean Time Between Failure

  MTBI           Mean Time Between Interrupts

  MTBM           Mean Time Between Maintenance

  MTBPM          Mean Time Between Preventive Maintenance

  MTF            Modulation Transfer Function

  MTI            Multispectral Thermal Imager

  MTL            Message Transfer Layer

  MTMGW          Machine-To-Machine Gateway

  MTMGW          Machine to Machine Gateway

  MTPE           Mission To Planet Earth

  MTPEO          Mission To Planet Earth Office

  MTR            Magnetic Torque Rod

  MTS            Microwave Temperature Sounder

  MTS            Mode Transition Sequence

  MTS            Meteoroid Technology Satellite (NASA)

  MTTR           Mean Time To Repair

  MTTR           Mean Time To Recover

  MTTRes         Mean Time To Restore

  MTTRS          Mean Time To Restore Service

  MTU            Message Transfer Unit

  MTVS           MODIS Test And Validation System

  MU             Microwave Unit

  MUA            Metadata Update Acknowledgement

  MUA            Mail User Agent

  MUC            Modified Unesco Classification System

  MUI            Management User Interface

  MUIS           Multi-Mission User Interface System

  Multi-BERT     Multiple Bit Error Rate Tester

  Multicast      A Point To Multi-Point Data Flow

  MUR            Metadata Update Request

  MUT            Metadata Update Tool

  Mux            Multiplexer

  MVI            Modified Vegetation Index

  MVI            MODIS Vegetation Index

  MWA            Momentum Wheel Assembly (AMSR-E)

  MWIR           Medium-Wavelength Infrared

  mwm            Motif Window Manager

  Mword          Megaword Of Memory

  MWP            Microwave Water Path

  MWRI           Medium-Wavelength Infrared

  MX             Metadata Ex

  N&MS           Network And Mission Services

  N/A            Not Applicable

  N/B            Narrowband

  NAAQS          National Ambient Air Quality Standards

  NAC            National Agency Check

  NACC           Network Automated Console Controller

  NACSIM         National Communications Security Instruction Memorandum

  NAD            Nadir Aperture Door

  Nadir          From Space, In A Direction, Directly Away From Zenith,
                 Toward The Center Of The Earth

  NADW           North Atlantic Deep Water

  NAIC           National Astronomy And Ionosphere Center (In Arecibo,
                 Puerto Rico)

  NALC           North American Land Characterization

  NAM            NASA Advisory Manager

  NAO            North Atlantic Oscillation

  NAO            National Astronomical Observatory (Japan)

  NAP            Network Access Point

  NAPP           National Aerial Photography Program

  NARA           National Archive And Records Administration

  NARSTO         North American Research Strategy For Troposheric Ozone

  NAS            National Academy Of Sciences

  NAS            Numerical Aerospace Simulation

  NAS            Network Attached Storage

  NAS            NASA Advisory Council

  NASA           National Aeronautics and Space Administration

  Nascom         NASA Communications Network

  NASCOM         NASA Communications

  Nascom II      Nascom Augmentation

  NASCOP         NASA Communications Operating Procedures

  NASDA          National Space Development Agency (Japan)

  NASIRC         NASA Automated Systems Incident Response Capabilities

  NASTRAN        NASA Structural Analysis (Program)

  NAU            Northern Arizona University

  NAUG           Nascom Augmentation

  NAV            Navigation

  NAWQA          National Water Quality Assessment

  NB             Narrowband

  NB             Noisy Bus

  NBDT           Narrowband Downlink Transmitter

  NBIOME         Northern Biosphere Observation And Modeling Experiment

  NBIS           Northern Biosphere Information System

  NBR            Navigation Base Reference

  NBS            National Bureau Of Standards

  NBS            National Biological Service

  NBTX           Narrowband Transmitter

  NC             Non-Complex

  NC             Network Computer

  NCA            Network Computing Architecture

  NCAR           National Center For Atmospheric Research

  NCC            Network Communication Center

  NCC            Network Control Center (GSFC)

  NCC            Network Control Center

  NCCD           NCC Directive

  NCCDS          NCC Data System

  NCDC           National Climatic Data Center  (NOAA) (Also NESDIC/NCDC)

  NCDS           NASA Climate Data System

  NCEP           National Center for Environmental Prediction

  NCEP           National Center For Environmental Prediction (NOAA)

  NCEP AWC       National Center For Environmental Prediction Air Weather
                 Center

  NCF            Nssdc Computer Facility

  NCGIA          National Center For Geographic Information And Analysis

  NCIA           Center For Information And Analysis

  NCIS           Nadir Climatic Interferometer/Spectrometer

  NCPS           Network Command Processing System

  NCR            Nonconformance Report 

  NCR            Non-Conformance Report

  NCRA           Nonconformance Reporting And Corrective Action System

  NCS            Nutation Control System

  NCS            Network Computing System

  NCSA           National Center For Supercomputer Applications 

  NCSA           National Computer Security Association

  NCSA           National Center for Supercomputer Applications

  NCSC           National Computer Security Center

  NCSL           National Computer Systems Laboratory

  NCSNET         Nascom Custom Subnetwork

  ND             Network Directorate

  ND             Networks Division

  nd:YAG         Neodymium:  Yttrium-Aluminum-Garnet

  NDA            Non Disclosure Agreement

  NDAAC          NSIDC DAAC

  NDBC           National Data Buoy Center

  NDI            Non-Developmental Items

  NDN            National Data Node

  NDP            Numerical Data Package

  NDPR           NASA Defense Purchase Request

  NDS            Non-Developmental Software

  NDS            Novell Directory Service

  NDSC           Network For The Detention Of Stratospheric Change

  NDVI           Normalized Difference Vegetation Index

  NEA            Non-Explosive Actuators

  NEA            Noise Equivalent Angle

  NEB            Non-Essential Bus

  NEC            North Equator Crossing

  NEC            National Electric Code

  NEDRES         National Environmental Data Referral System

  NEG            Numerical Experimentation Group (Of CLIVAR)

  NEOC           Non-Essential Over-Current

  NEPA           National Environmental Policy Act

  NEPP           NASA Electronic Parts And Packaging

  NERC           National Environmental Research Center

  NERP           National Environmental Research Park

  NESDD          NOAA Earth Science Data Directory

  NESDIS         National Environmental Satellite, Data, And Information
                 Service (NOAA)

  NESR           Noise Equivalent Source Radiance

  NESR           Noise Equivalent Spectral Radiance

  NET            No Earlier Than

  netCDF         Network Common Data Format

  NetCDF         Non-HDF Formats

  NEVADA         Net Energy Verification And Determination Analyzer

  NewDISS        New Data And Information Systems And Services

  NEWS           NOAA's Earth Watch Service

  NEXRAD         Next Generation Weather Radar 

  NF             Noise Figure

  NFE            NCC Front End

  NFOV           Narrow Field-Of-View

  NFPA           National Fire Protection Association

  NFS            Network File System

  NG             Northrop Grumman

  NGDC           National Geophysical Data Center (NOAA)

  NGO            Non-Governmental Organization

  NGST           Next Generation Space Telescope

  NGST           Northrop Grumman Space Technology

  NGT            NASA Ground Terminal

  NH             Northern Hemisphere

  NHA            Next Higher Assembly

  NHAP           National High Altitude Photography

  NHB            NASA Handbook

  NHC            National Hurricane Center

  NI             NASA Internet

  NI DAQ         National Instruments Data Acquisition

  NIA            Network Integration And Analysis

  NIAC           NASA Institute For Advanced Concepts

  NIC            Network Interface Card

  NIC            National Ice Center

  NIC            NASA Information Center

  NICMOS         Near Infrared Camera And Multi-Object Spectrometer

  NID            Network Interface Device

  NIES           National Institute Of Environmental Science (Japan)

  NiH            Nickel Hydrogen

  NII            National Information Infrastructure

  NIIT           National Information Infrastructure Testbed

  NIMA           National Imagery And Mapping Agency

  NIMBUS         NASA Meteorological Satellites (1 Thru 7)

  NIMBUS         NASA Meteorological Satellite

  NIPC           National Infrastructure Protection Center

  NIPR           National Institute For Polar Research (Japan)

  NIR            Near Infrared

  NIS            Network Information Service

  NISC           NISN Information Support Center

  NISDDT         Nascom Interface Standards For Digital Data Transmission

  NISE           Near Real-Time SSM/I EASE-Grid Daily Global Ice
                 Concentration And Snow Extent

  NISN           NASA Integrated Services Network

  NISS           NASA Institutional Support Systems

  NIST           National Institute Of Standards And Technology

  NIU            Network Interface Unit

  NIVR           Netherlands Agency For Aerospace Programmes (Nederlands
                 Instituut Voor Vliegtuigontwikkeling en Ruimtevaart)

  NIVR           Netherlands Space Agency

  NIX            NASA Image Exchange

  Nl             Netherlands

  NLAPS          National Landsat Archive Production System

  NLDC           NASA Landsat Data Collection

  NLDN           National Lightning Detection Network

  NLM            NASA Launch Manager

  NLSP           Netware Link Services Protocol

  NM             Network Management

  NMA            Network Management Application

  NMC            Network Management Center

  NMC            National Meteorological Center (NOAA)

  NMCC           Nascom Management Control Center

  NMCI           Network Management Configuration Item

  NMD            NASA Master Directory

  NMF            Network Management Facility

  NMF            Network Management Forum

  NMFS           National Marine Fisheries Service

  NMHC           Non-Methane Hydrocarbons

  NMI            NASA Management Instruction

  NMOS           Network And Mission Operations Support (NASA Program)

  NMOS           NASA Management And Operations Support

  NMP            New Millennium  Program

  NMS            Neutral Mass Spectrometer

  NMS            Network Management System

  NMS            Network Management Subsystem (ECOM)

  NMSP           Networks And Mission Services Project

  NNGS           Nascom Network Gateway System

  NNI            Network To Network Interface

  NNM            Network Node Manager

  NNM            Hp Open View Network Node Manager

  NNTP           Network News Transfer Protocol

  NO             Number

  NOAA           National Oceanic And Atmospheric Administration

  NOAA SAA       NOAA Satellite Active Archive

  NOARL          Naval Oceanographic And Atmospheric Research Lab

  NOBL           New Outer Blanket Layers

  NOC            Network Operations Center

  NOCC           Network Operations Control Center (DSN)

  NODC           National Oceanographic Data Center (NOAA)

  NODS           NASA Ocean Data System

  NOE            Network Operations Exercises

  NOLAN          Nascom Operational Local Area Network

  NOM            Network Operations Manager

  NOMC           Network Operations Management Center

  NOP            No Operation

  NOPEX          Northern Hemisphere Climate-Processes Land-Surface
                 Experiment

  NOPS           Nimbus Ozone Processing System

  NOR            Notice Of Revision 

  NORAD          North American Aerospace Defense Command

  NORDA          Naval Ocean Research And Development Activity

  NOS            Network Operating System

  NOSE           Nominal Orbit Spatial Extent

  NOSIE          Nodc Ocean Science Information Exchange

  NOSP           Networks Operation Support Plan

  NOSP           Network Operations Support Plan

  NOSS           National Oceanic Satellite System

  NPAS           Network Planning And Analysis System

  NPCS           Narrowband PCS

  NPG            Network Protocol Gateway

  NPG            NASA Policy And Guidelines

  NPG            NASA Procedures and Guidelines

  NPOESS         National Polar Orbiting Environmental Satellite System

  NPOP-1         NASA Polar Orbiting Platform (One)

  NPP            Net Primary Productivity

  NPP            NPOESS Preparatory Project

  NPPA           California Native Plant Protection Act

  NPRD           Nonelectronic Parts Reliability Data

  NPSNET         Nascom Packet Switched Subnetwork

  NQA            National Quality Assurance

  NRA            NASA Research Announcement

  NRC            National Research Council

  NRCA           Nonconformance Reporting And Corrective Action

  NRCS           Natural Resource Conservation Service

  NRCT           National Research Council Of Thailand

  NRDN           NOAA Radar Data Network

  NREN           National Research And Education Network

  NRL            Naval Research Laboratory

  NRLM           National Research Laboratory Of Metrology (Japan)

  NRN            National Research Network

  NRP            National Resource Protection

  NRSC           National Remote Sensing Centre (UK)

  NRT            Near Real-Time

  NRT            Near Real Time (Data)

  NRT            Network Readiness Test

  NRTP           Near Real-Time Processor

  NRTP           Near Real Time Processor

  NRTS           Near Real-Time System

  NRZ            Non Return To Zero

  NRZ-L          Non Return To Zero-Level

  NRZ-M          Non Return To Zero, Mark

  NRZI           Non-Return To Zero Invert On Ones

  NSAP           Network Service Access Point

  NSAPI          Netscape Server Api

  NSAT           Network Security Assessment Team

  NSBF           National Scientific Balloon Facility

  NSC            Network Support Committee

  NSCAT          NASA Scatterometer

  NSDD           National Security Decision Directives

  NSDI           National Spatial Data Infrastructure

  NSDS           NASA Software Documentation Standard

  NSF            National Science Foundation

  NSFNet         Nsf Network

  NSG            Network Services Group

  NSGIC          National States Geographic Information Council

  NSGW           Nascom Service Gateway

  NSI            National Science Institute

  NSI            NASA Science Internet

  NSIDC          National Snow and Ice Data Center

  NSIDC          National Snow And Ice Data Center (DAAC)

  NSIP           Nasa Student Involvement Program

  NSIPO          NASA Science Internet Project Office

  NSM            Network Support Manager

  NSM            Network Status Monitor

  NSN            NASA Science Network

  NSP            NASA Support Plan

  NSP            Network Service Provider

  NSPAR          Nonstandard Part Approval Request

  NSpC           National Space Council

  NSPD           National Space Policy Directive

  NSPL           Non-Standard Parts List

  NSR            NISN Service Request

  NSRS           Natural Environment Research Council (BNSC)

  NSSDC          National Space Science Data Center

  NSSL           National Strong Storm Laboratory

  NSTC           National Space And Technology Council

  NSTR           NASA Standard Tape Recorder

  NSTS           National Space Transportation System

  NT             Not Tested

  NT             Network Transport

  NTE            Not To Exceed

  NTIA           National Telecommunications And Information
                 Administration

  NTIC           National Technical Information Center

  NTISS          National Telecommunications And Information Systems
                 Security Policy

  NTP            Network Transport Protocol

  NTP            Network Time Protocol

  NTR            New Technology Report

  NTSC           National Television Standards Committee

  NTT            Nippon Telephone And Telegraph

  NTTF           NASA Test And Training Facility

  NU             No Unit (Or Unitless)

  NUMA           Non-Uniform Memory Access

  NUS            No Upper Stage

  NUWIG          NCC User Working Interface Group

  NV             Not Verified

  NVAP           NASA Water Vapor Project

  NVM            Non-Volatile Memory

  NVR            Non-Volatile Residue

  NVRAM          Non-Volatile Ram

  NWCI           Networking Configuration Item

  NWP            Numerical Weather Prediction

  NWS            National Weather Service (NOAA)

  NWS-HRL        NWS - Hydrologic Research Laboratory

  NWS-RFC        Nws - Regional Forecast Center

  NWS-RFO        Nws - River Forecast Office

  NYC            Not Yet Complete

  O&C            Operations And Checkout

  O&M            Operations And Maintenance

  O-Team         Operability Team

  O/A            Orbit And Altitude

  O/A            Operations Agreement

  OA             Operations Agreement

  OA             Off-Line Analysis Process

  OA             Orbital Activation

  OA             Optical Assembly

  OA             Operational Attitude

  OA             Ornital Analyst

  OA SCS         Orbital Activation Stored Command Sequences

  OA-MSCIF       Optical Assembly Mscif

  OA-TH          Optical Assembly Thermal Hardware

  OAC            Optical Alignment Cube

  OAP            Orbital Activation Plan

  OAPR           Orbital Activation Plan Review

  OASIS          Operations And Science Instrument Support

  OASIS          Office Automation Systems Improvement Standards

  OASIS          Organization For The Advancement Of Structured
                 Information Standards

  OASIS-CC       OASIS - Command and Control

  OASIS-IS       OASIS - Interface System

  OASIS-PS       OASIS - Planning and Scheduling

  OASM           Operational Analysis Support Model

  OAT            Operational Algorithm Teams

  OBC            On-Board Computer

  OBC            On-Board Calibrator

  OBDC           On Board Doppler Computation

  OBFM           On-Board Fault Management

  OBFM           On Board Fault Management

  OBM            Orbital Balancing Mechanism

  OBP            On-Board Processor

  OBRS           On-Board Radiation Source

  OC             Operational Capability

  OC             Operations Controller

  OC             Optical Carrier

  OC-3           Optical Carrier Level 3

  OCC            Operations Control Center

  OCC/MPS        Operations Control Center/Mission Planning System

  OCD            Operations Concept Document

  OCF            Operational Control Field

  OCG            Ocean Catalog Group (NASA)

  OCH            Operations Coordination Handbook

  OCI            Ocean Color Imager

  OCI            Oracle Call Interface

  OCL            Open Client Library

  OCM            Ocean Color Mission

  OCMIP          Ocean Carbon-Cycle Model Intercomparison Project

  OCR            Optical Character Recognition

  OCR            Operations Control Room

  OCR/ICR        Optical Character Recognition/Intelligent Character
                 Recognition

  OCS            Operator Control Subsystem

  OCT            Ocean Color And Temperature

  OCTS           Ocean Color And Temperature Scanner  (ADEOS)

  OD             Outside Diameter

  OD             Orbit Determination

  OD             Operational Day

  ODB            Operational Database

  ODBC           Open Database Connectivity

  ODBMS          Object Oriented Data Management System

  ODC            Other Data Center

  ODE            Orientation Drive Electronics

  ODF            Operational Data File

  ODFRM          On-Demand Form Request  Manager (Cls)

  ODIN           Outsourcing Desktop Initiative For NASA

  ODIS           Office Of Data Information Systems

  ODIS           Operations Data And Information Systems

  ODL            Object  Description Language

  ODL            Object Definition Language

  ODM            Operational Data Message

  ODM            Operations Data Message

  ODMA           Open Document Management Api

  ODMG           Open Database Management Group

  ODMS           Object Data Management System

  ODP            Open Distributed Processing

  ODP            On-Board Data Processor

  ODP            Ozone Depletion Potential

  ODPR           On-Demand Production Request

  ODPRM          On-Demand Production Request Manager (Pls)

  ODPS           OMI Dutch Processing System

  ODR            Optical Data Recorder (ADEOS II)

  ODS            One Day Schedule

  ODS            Operational Data Store

  ODT            Operational Data Tapes

  ODT            One Day Test

  ODU.S.         Ozone Dynamics Ultraviolet Spectrometer (CHEMISTRY)

  OE             Operations Engineering

  OEC            Operations Engineering Center

  OEM            Original Equipment Manufacturer

  OEM            Operations Engineering Manager

  OES            Object Encapsulation Software

  OES            Office Of Earth Science

  OFS            Orbiter Filght Simulator

  OGC            Open Gis Consortium

  OGCM           Ocean General Circulation Model

  OGO            Orbiting Geophysical Observatory

  OH             Operations Handbook

  OHS            Order Handling System

  OI             Operating Instructions

  OI             Operations Integrator

  OI&T           Operations Integration And Testing

  OI(1)          Singly Ionized Oxygen Emission Line

  OICD           Operational Interface Control Document

  OICD           Orbit Injection And Constellation Deployment (Mode)

  OIL            Observational Instrument Laboratory

  OIM            Open Information Model

  OIP            Operations Interface Procedure

  OIVP           On-Orbit Initialization And Verification Plan

  OJT            On-The-Job Training

  OJT            On-the Job Training

  OLAP           On-Line Analytical Processing

  OLE            Object Linking, Tools

  OLE            Object Linking And Embedding

  OLME           Ozone Layer Monitoring Experiment

  OLMSA          Office Of Life Microgravity Sciences And Applications

  OLR            Outgoing Longwave Radiation

  OLS            Optical Line Scanner

  OLS            Orbital Launch Services

  OLS            Operational Linescan System

  OLS            Optical Linescan System

  OLTP           On-Line Transaction Processing

  OM             Operations Manager

  OM             Operations Management

  OMA            Object Management Architecture

  OMA            Oblique Mercator, Type A

  OMB            Oblique Mercator, Type B

  OMB            Office of Management and Budget

  OMCF           Orbiter Maintenance And Checkout Facility

  OMD            Operations Management Data

  OMDSIM         Operations Management Data Simulator

  OMF            Object Management Framework

  OMF            Operations Management Function

  OMG            Object Management Group

  OMI            Ozone Measuring Instrument

  OMI            Opsec Management Group

  OMI            Ozone Monitoring Instrument (Chemistry Project)

  OMI            Ozone Monitoring Instrument

  OMIDAPS        OMI DAta Processing System

  OMIE           OMI - EOS

  OMIS           Ozone Monitoring Instrument System

  OMIS           Optical Multichannel Imaging Sensor (NPOESS)

  OMPS           Ozone Mapper And Profiler Suite

  OMPWG          ASTER Operation And Mission Planning Working Group

  OMS            Observation From The Middle Stratosphere

  OMS            Orbital Maneuvering System

  OMT            Object Modeling Technique

  OMTPE          Office Of The Mission To Planet Earth

  OMV            Orbital Maneuvering Vehicle

  ONC            Operational Navigational Charts

  ONE            Open Network Environment (Netscape)

  ONRTS          OMI Near Real-Time System

  ONU            Optical Network Unit

  ONVS           Ozone Near-real-time and Very-fast-delivery System

  OO             Object Oriented

  OOA            Object-Oriented Analysis

  OOA            Object Analyst

  OOD            Object-Oriented Design

  OOD            Operational Orbit Determination

  OODBMS         Object-Oriented Database Management System

  OODCE          Object-Oriented Distributed Computing Environment

  OOL            Out Of Limits

  OOL            Object Oriented Language

  OOOM           On-Orbit Operations Manual

  OOOS           Object-Oriented Operating System

  OOP            Object-Oriented Programming

  OOPL           Object-Oriented Programming Language

  OOPS           Object-Oriented Programming And Systems

  OORDB          Object-Oriented Relational Data Base

  OOT            Out Of Tolerance

  OP             Operations

  OP             Over-Pressure fault

  OPB            Operations Baseline

  OPD            Operations Document

  OPD            Operation Procedure Document

  OPF            Orbiter Processing Facility

  OPF            Operational Parameter File

  OpLAN          Operational Local Area Network

  OPM            Operations Message

  OPM            Operational Message

  OPM            Office Of Personnel Management

  OPP            Opportunity

  OPPM           Outside The Principal Period Of Maintenance

  OPPM           Outside PPM Hours

  OPR            Operational

  OPR            On-Demand Production Request

  OPS            Onboard Payload Support Operations

  OPS            Open Profiling Standard

  OPS            On-Board Payload Support

  OPS            Operations

  OPS            Optical Sensor

  OPS SUPER      Operations Supervisor

  OPSEC          Open Platform For Secure Enterprise Connectivity

  OPSIM          Program For Operations Simulator And For The CCDM Model

  OPT            Ozone Processing Team

  OQL            Object Query Language

  OR             Operations Requirements

  ORACLE         On-Line Inquiry And Report Generator

  ORB            Object Request Broker

  ORBSIM         Orbit Simulation (a part of SDP Toolkit)

  ORDBMS         Object Rational Database Management System

  ORE            Operations Readiness Exercise

  ORF            Orbital Reference Frame

  ORNL           Oak Ridge National Laboratory (DAAC)

  ORPA           Operations Readiness And Performance Assurance

  ORPC           Object Remote Procedure Call

  ORR            Operations Readiness Review

  ORT            Operations Readiness Test

  ORT            Operations Readiness Training

  ORU            Operational Replacement Unit

  OS             Object Services

  OS             Operating System

  OSAB           OMI Science Advisory Board

  OSC            Orbital Sciences Corporation

  OSC            Office Of Space Communications

  OSD            Open Software Description

  OSDPD          Office Of Space Data Processing And Distribution  (NOAA)

  OSF            Open Software Foundation

  OSF            Open Systems Foundation

  OSF            Office Of Space Flight (NASA Hq)

  OSF            Observation Schedule File

  OSHA           Occupational Safety And Health Administration

  OSI            Open Systems Interconnection

  OSI-RM         OSI Reference Model

  OSIPS          OMI Science Investigator-led Processing System

  OSM            Open Storage Manager

  OSMA           Office Of Safety And Mission Assurance

  OSO            Office Of Space Operations

  OSP            Operations Support Product

  OSP/A          Orbiting Satellite Project/Application

  OSP/S          Orbiting Satellite Project/Science

  OSPF           Open Shortest Path First (Routing Protocol)

  OSS            Office Of Space Station

  OSS            Operational Support Software

  OSSA           Office Of Space Science And Applications

  OSSE           Observing System Simulation Experiments

  OSSE           Oriented Scintillation Spectrometer Experiment

  OST            Operations Support Team

  OSTDS          Office Of Space Tracking And Data Systems

  OSTP           Office Of Science And Technology Policy

  OSU            Oregon State University

  OT             Open Technology

  OT             Over-Temperature fault

  OT&E           Operational Test And Evaluation

  OTA            Office Of Technology Assessment

  OTAE           Other Technical Assets Employed

  OTD            Optical Transient Detector

  OTJ            On The Job

  OTMM           Observatory Thermal Math Model

  OTP            Open Trading Protocol

  OTS            Off-The-Shelf

  OTS            Object Transaction Service (Corba)

  OTS            Optical Test Source

  OTTER          Oregon Transect Terrestrial Ecosystem Research

  OTV            Orbital Transfer Vehicle

  OU             Organizational Unit

  OU             Oxford University

  OV             Over Voltage

  OV             Open View

  OV             Orbit Verification

  OVW            Hp Open View Windows

  OWG            Operations Working Group

  OZON-MIR       Ozone Trace Gas And Aerosol Monitor On Mir

  P P/B          Priority Playback

  P&CS           Planning And Control System

  P&S            Planning And Scheduling

  P&S            Planning and Schedule

  P-NNI          Private Network To Network Interface

  p-p            Peak-To-Peak

  P/B            Playback

  P/L            Payload

  P/S            Planning/Scheduling

  P/T            Pending Test

  PA             Payload Accommodations

  PA             Performance Assurance

  PA             Product Assurance

  PA             Power Amplifier

  PA             Performance Analyst

  PA             Prototype Algorithm

  PAA            Payload Accommodation Assembly

  PAA            Program Associate Administrator

  PAAS           Platform Archive And Analysis System

  PABSI          Profiling A-Band Spectrometer/Visible Imager

  PAC            Privilege Attribute Certificate

  PACC           Program Analysis And Control Contract

  PACOR          Packet Processor

  PACS           Polar Acquisition And Command System

  PACS           Pan American Climate Study (Goals)

  PAD            Precision Attitude Determination

  PAF            Processing And Archiving Facility (ESA)

  PAF            Payload Attach Fitting

  PAF            Payload Attached Fixture

  PAGES          Past Global Changes (IGBP)

  PAIP           Performance Assurance Implementation Plan

  PAL            Parts Accumulation List

  PAL            Phases Alternate Line

  PALS           Procedure Automation Language Shell

  PAM            Permanent Archive Manager

  PAM            Performance Assurance Manager

  PAM            Payload Assist Module

  PAM-D          Payload Assist Module-Delta

  PAMM           Permanent Archive And Media Management

  PAN            Production Acceptance Notification

  PAO            Performance Analyst Office

  PAPL           Project Approved Parts List

  PAR            Performance Assurance Requirements

  PAR            Platform Acceptance Review

  PAR            Photosynthetically Active Radiation

  PAR            Photosynthetically Available Radiation

  PARABOLA       Automatic BRDF Imaging Surface Instrument

  PARABOLA III   Portable Apparatus For Rapid Acquisition Of
                 Bidirectional Observations Of The Land And Atmosphere

  PARCA          Program For Arctic Regional Climate Assessment

  PARS           Playback Anomaly Recovery System

  PAS            Platform Analysis Software

  PAS            Platform Analysis System

  PAS            Planning And Scheduling

  PAS            Planning And Scheduling Subsystem

  PASCAL         Programming Language (Named After Blaise Pascal)

  PB             Petabyte (10\*\*\*15 )

  PB             Playback

  PB4            Parallel Grouped Binary Millisecond/Microsecond Time
                 Code

  PB5            Parallel Grouped Binary Time Code 5

  PBAT           Power Module Battery

  PBAT           Power Equipment Module Battery

  PBC            Performance Based Contracting

  PBI            Person Based Interface (Non Automated)

  PBIO           Processor Backplane I/O

  PBK            Playback

  PBL            Product Baseline

  PBL            Planetary Boundary Layer

  PC             Personal Computer

  PC             Printed Circuit

  PC             Photo Conductive

  PC             Process Control

  PC             Polyconic

  PC             Power Controller

  PC             Performance Criteria

  PC             Parameter Control

  PCA            Program Control Analyst

  PCA            Physical Configuration Audit

  PCA            Product Configuration Audit

  PCA            Program Committment Agreement

  PCAM           Program Complexity Analysis Methodology

  PCAR           Platform Core Activity Request

  PCB            Programmable Circuit Breaker

  PCB            Program Control Board

  PCB            Parts Control Board

  PCB            Project Control Board

  PCC            Platform Control Center

  PCC            Payload Checkout Cells

  PCD            Payload Correction Data

  PCD            Periodic Convolutional Deinterleaver

  PCDS           Pilot Climate Data System (Became NCDS)

  PCDS           PCD Processing Subsystem

  PCE            Power Control Electronics

  PCF            Process Control File

  PCFG           Program Configuration File (Management Agent)

  PCHS           Program Control Hierarchy System

  PCI            Peripheral Component Interface

  PCI            Peripheral Component Interconnect

  PCI            Product Configuration Identification

  PCI            Periodic Convolutional Interleaver

  PCI            Personal Computer Interface

  PCL            Planning Class Libraries

  PCM            Pulse Code Modulated

  PCM            Physical Configuration Management

  PCMB           Project Configuration Management Board

  PCMU           Power Control Monitoring Unit

  PCMU           Propulsion Control And Monitor Unit

  PCN            Personal Communications Network

  PCO            Procedure Change Order

  PCON           Proof Of Concept 

  PCP            Platform Controls Processor

  PCP            Payload Control Processor

  PCR            Peak Cell Rate

  PCR            Procedure Change Request

  PCR            Product Change Request

  PCR            PMS Compliance Review

  PCS            Pointing Control System

  PCS            Pre-defined Command Sequence

  PCS            Predefined Command Scripts

  PCS            Planning And Control System

  PCS            Predefined Command Script

  PCS            Predefined Command Sequences

  PCS            Personal Communications Services

  PCSF           Project Completion Statistics Form

  PCT            Preliminary Console Training

  PCU            Power Control Unit

  PDA            Power Distribution Assembly

  PDA            Preliminary Design Audit

  PDAS           Predicted Data Availability Schedules

  PDB            Project Database

  PDB            Program Database

  PDB            Project Data Base

  PDBS           Parallel Database System

  PDD            Payload Definition Document

  pdf            Portable Document Format

  PDF            Programmable Data Formatter

  PDF            Payload Data Formatter

  PDH            Production Data Handling

  PDHF           Production Data Handling Function

  PDI            Professional Development Initiative

  PDL            Program Design Language

  PDM            Propellant Distribution Module

  PDMO           Product Data Management Office

  PDMP           Program Data Management Plan

  PDMP           Project Data Management Plan

  PDP            Program Development Plan

  PDP            Production Data Processing

  PDPS           Planning And Data Processing System

  PDPS           Planning And Data Processing Subsystem

  PDPS           Planning And Data Production System

  PDPS           Product Data Processing Subsystem

  PDQ            Panel On Data Quality

  PDR            Preliminary Design Review

  PDR            Product Delivery Record

  PDR-A          Preliminary Design Review Release-A

  PDRD           Product Delivery Record Discrepancy

  PDS            Production Data Set

  PDS            Production Data System

  PDS            Production Data Specialist

  PDT            Procurement Development Team

  PDT            Pacific Daylight Time

  PDTT           Product Development Tracking Tool

  PDU            Protocol Data Unit

  PDU            Power Distribution Unit

  PDW            Preliminary Design Walk-Through

  PEB            Performance Evaluation Board 

  PECL           Positive Emitter Coupled Logic

  PEF            Project Estimates Form

  PEL            Permissible Exposure Limit

  PEM            Particle Environment Monitor

  PEM            Pacific Exploratory Mission

  PEM            Production Efficiency Model

  PEM            Privacy-Enhanced Mail

  PEP            Performance Evaluation Plan

  PER            Pre-Environmental Review

  PERD           Project Element Requirements Document

  PERD           Program Elements Requirements Document

  PERL           Practical Extraction And Report Language

  Perl           A UNIX Programming Language

  PERT           Program Evaluation Review Technique

  PERT           Project Evaluation Review Technique

  PET            Potential Evapo Transportation

  PETS           Performance Evaluation And Test System

  PEU            Processing Electronics Unit (HSB)

  PeV            Parameter Equals Value

  Pf             Pico-Farad

  PF             Process Framework

  PF-1           Poker Flats Ground Station (Alaska)

  PF1            Poker Flat (DataLynx 11-meter antenna)

  PFDP           Preliminary Flight Data Packages

  PFM            Proto-Flight Model

  PFPA           Prime Focal Plane Assembly

  PFU            Proto-Flight Unit

  PGE            Product Generation Executive (Formerly Product
                 Generation Executable)

  PGE            Product Generation Executive

  PGGA           Permanent GPS Geodetic Array

  PGM            Portable Grey Map (Image File Format)

  PGML           Precision Graphics Markup Language

  PGN            Polar Ground Network

  PGS            Product Generation Service

  PGS            Product Generation System (ASTER)

  PGS            Polar Ground Station

  PGSTK          Product Generation System Toolkit (Obsolete Name,
                 Replaced By SDPTK)

  PH             Production History

  PHD            The Polar HDF-EOS Data Imaging And Subsetting

  PHY            Physical Layer Protocol

  PI             Principal Investigator

  PI             Primary Investigator

  PI             Project Instruction

  PI             Process Instruction

  PI/TL          Principal Investigator/Team Leader

  PIA            Project Initiation Agreement

  PIC            Payload Interface Controller

  PICA           Platform Independent Cryptography Api

  PICASSO        Pathfinder Instruments For Cloud And Aerosol Spaceborne
                 Observations

  PICASSO-CENA   Pathfinder Instrument For Cloud And Aerosol Spaceborne
                 Observations (Climatologie Etendue Des Nuages Et Des
                 Aerosols)

  PICF           Principal Investigator Computing Facility

  PICS           Procurement And Inventory Control System 

  PICS           Platform For Internet Content Selection

  PID            Parameter Identification

  PID            Parameter Identifier

  PID            Prototype International Directory

  PID            Proportional Integral And Derivative

  PID            Process Identification Number

  PIK            Precision Injection Kit

  PIK            Potsdam Institute For Climate Impact Research

  PILPS          Project For Intercomparison Of Land Surface
                 Parameterization Schemes

  PIM            Protocol Independent Multicast

  PIMS           Project Information Management System

  PIN            Password Identification Number

  PIN            Process Identification Number

  PIN            Project Identification  Number

  PIND           Particle Impact Noise Detection

  PING           Packet Internet Groper

  PIO            Policy Implementation Office

  PIP            Project Implementation Plan

  PIP            Payload Integration Plan

  PIP            Premium Internet Protocol

  PIPOR          Programme Of International Polar Oceans Research

  PISCF          Principal Investigator Science Computing Facility

  PISP           Polar Ice Sheet Program

  PIT            Product Integration Team

  PITS           Program Issue Tracking System

  PITS           Project Issue Tracking System

  PIU            Power Interface Unit

  PK             Primary Key

  PKF            Poker Flat

  PKI            Public Key Infrastructure

  PL             Payload

  PL-DRO         Phase Locked Dielectric Resonance Oscillator

  PLANG          Planning Subsystem (CI)

  PLANG          Production Planning CSCI

  PLB            Payload Bus

  PLDS           Pilot Land Data System

  PLDS           Pilot Land Development System

  PLE            Payload Executive Processor

  PLF            Payload Fairing

  PLN            Plan

  PLN            Planning (Workstation)

  PLNHW          Planning Hardware \[Configuration Item\]

  PLO            Phase Locked Oscillator

  PLOP           Physical Layer Operations Procedure

  PLS            Planning Subsystem 

  PLT            Platform

  PM             Preventive Maintenance

  PM             Program Manager

  PM             Project Manager

  PM             Propulsion Module

  PM             Phase Modulation

  PM             Post Meridian

  PM             Afternoon (Post Meridian)

  PMA            Project Manager's Assessment

  PMA            Platform Management Application

  PMA            Performance Management Application

  PMA            Performance Measurement Application

  PMAD           Power Management And Distribution

  PMAS           Performance Management Application Service

  PMB            Performance Measurement Baseline

  PMC            Pressure-Modulated Cell

  PMCD           Part Material Control Document

  PMCU           Propulsion Module Control Unit

  PMD            Physical Layer Medium Dependent

  PMD            Physical Layer Medium Protocol

  PMD            Propulsion Management Device

  PMD            Polarization Mode Dispersion

  PMDB           Program Master Database

  PMDR           Physical Media Delivery Record

  PMEA           Propulsion Module Electronics Assembly

  PMF            Product Metadata File

  PMH            Project Management Handbook

  PMIR           Pressure Modulated Infrared Radiometer

  PMIRR          Pressure Modulated Infrared Radiometer

  PMIS           Project Management Information System

  PML            Program Maintenance Library

  PMMI           PM Microwave Imager

  PMO            Project Management Office

  PMP            Project Management Plan

  PMP            Payload Mounting Plate

  PMP            Preliminary Mission Plan

  PMP            Parts, Material, And Processes

  PMPCB          Parts, Material, And Processes Control Board

  PMPDR          Physical Media Product Delivery Record

  PMR            Program Management Review

  PMR            Project Management Review

  PMR            Pressure-Modulated Radiometer

  PMRD           Preliminary Mission Requirements Document

  PMS            Performance Measurement System

  PMS            Platform Management System

  PMSR           Performance Measurement Status Report

  PMSR           Preliminary Monthly Status Review

  PMSWG          Platform Management System Working Group

  PMT            Photo Multiplier Tube

  PMT            Photomultiplier

  PMUDR          Physical Media Unit Delivery Record

  PN             Pseudorandom Noise

  PN             Pseudo-Random Number

  PNG            Portable Network Graphics

  PNM            Physical Network Management

  PNNL           Pacific Northwest National Laboratory

  PNZ            Phytoplankton-Nutrient-Zooplankton

  PO             Program/Product Order

  PO             Project Office

  PO             Purchase Order

  PO             Polar Oceans

  PO             Program Office

  PO.DAAC        Physical Oceanography Distribution Active Archive Center
                 (JPL)

  PO.DAAC        Physical Oceanography DAAC

  POAM           Polar Ozone And Aerosols Mission

  POC            Point Of Contact

  POC            Product Order Cancellation

  POCC           Payload Operations Control Center

  POCC           Project Operations Control Center

  POD            Precision Orbit Determination

  PODB           Product Order Data Base

  PODS           Precision Orbit Determination System

  POEM           Polar-Orbit Earth Observation Mission

  POEMS          Positron Electron Magnet Spectrometer

  POES           Polar-Orbiting Operational Environmental Satellite

  POGO           Polar-Orbiting Geophysical Observatory

  POIC           Payload Operations Integration Center

  POLAR          Polar Plasma Laboratory

  POLARIS        Photochemistry Of Ozone Loss In The Artic Region In
                 Summer

  POLDER         Polarization And Directionality Of Earth\'s Reflectances

  POLES          Polar Exchange At The Sea Surface

  POM            Potential Monitor (TEDA)

  POP            Polar-Orbiting Platform

  POP            Point Of Presence

  POP            Post Office Protocol

  POR            Power Off Reset

  POS            Product Order Status

  POSIX          Portable Operating System Interface For Computer
                 Environments

  POSR           Product Order Status Request

  PPCR           Pass Plan Change Request

  PPDS           Planning, Processing And Data Server

  PPF            Payload Preparation Facility

  PPF            Payload Processing Facility

  PPL            Preferred Parts List

  PPLU           Propellant And Pressurant Loading Unit

  ppm            Pixels Per Minute

  PPM            Principal Period Of Maintenance

  PPP            Point-To-Point Protocol

  PPR            Payload Preparation Room

  PPR            Photopolarimeter Radiometer

  pps            Pulses Per Second

  PPS            Portable Platform Simulator

  PPS            Payload Pointing System

  PPS            Packets Per Second

  PPS            Payload Power Supply

  PPTP           Point-To-Point Tunneling Protocol

  PQCM           Particulate Quartz Crystal Microbalance

  PQSR           Project Quarterly Status Review

  PR             Procurement Request

  PR             Product Request

  PR             Polarization Ratio

  PR             Problem Report

  PR             Precipitation Radar (TRMM)

  PRA            Pyro-Relay Assembly

  PRADS          Primary Attitude Determination System

  PRAP           Precision Rate and Attitude Packet (ICESat)

  PRAREE         Precise Range And Range Rate Equipment \-- Extended

  PRB            Problem Report Message

  PRBS           Pseudo-Random Bit Sequence

  PRBS           Pseudo-Random Bit Stream

  PRC            Passive Radiative Cooler (MODIS)

  PRE            Preformatted (HTML)

  Pre-MOVE       Pre-Mopitt Oklahoma Validation Experiment

  PREPS          Preparations

  PRF            Pulse Repetition Frequency

  PRF            Pass Results Files

  PRI            Primary Rate Interface

  PROC           Processor

  PROC           Procedure

  PROCs          Procedures

  PROM           Programmable Read Only Memory

  PRONG          Processing Subsystem (CI)

  PRONG          Processing CSCI

  PROP           Propulsion

  PROPS          Propulsion Subsystem (Terra AM-1)

  PROTO          Prototyping

  Prr            Pulse Repetition Rate

  PRR            Preliminary Requirements Review

  PRT            Platinum Resistance Thermisters

  ps             Postscript

  Ps             Probability Of Station Availability

  PS             Polar Stereographic

  PS             Processor Sharing

  PS             Propulsion Subsystem

  PS             Planning/Scheduling

  PS             Project Scientist

  PSAT           Predicted Site Acquisition Table

  PSC            Premodulation Signal Conditioner

  PSC            Polar Science Center

  PSC            Polar Stratospheric Clouds

  PSCN           Program Support Communications Network

  PSCNI          Program Support Communication Network-Internet

  PSD            Planning And Scheduling Data

  PSDN           Packet Switched Data Network

  PSDR           Preliminary System Design Review

  PSIOC          Processor Support And I/O Controller

  PSK            Phase-Shift Keying

  PSLA           Project Service Level Agreement

  PSLA           Program Service level Agreement

  PSLA           Program Support Level Agreement

  PSM            Persistent Stored Module

  PSN            Net Photosynthesis

  PSO            Project Science Office

  PSR            Pre-Ship Review

  PSR            Pulsar

  PSR            Program Status Review

  PSRR           Preliminary System Requirement Review

  PSS            Portable Simulation System

  PST            Pacific Standard Time

  PSTN           Public Switched Telephone Network

  PSU            Power Switching Unit

  PSU            Pennsylvania State University

  PT             Plain Text

  PTA            Post-Test Analysis

  PTP            Programmable Telemetry Processor

  PTR            Post Test Review

  PTS            Power Test Set

  PTS            Prototype Tracking System

  PTT            Protocol Task Team

  PU             Processing Unit

  PVC            Permanent Virtual Circuit

  PVC            Performance Verification Center

  PVCC           Permanent Virtual Channel Connection

  PVL            Parameter Value Language

  PVPC           Permanent Virtual Path Connection

  PVT            Performance Verification Test

  PVV            Project-level Verification and Validation

  PVVF           Project-specific Verification and Validation Facility

  PW             Pulse Width

  PW             Precipitable Water

  PWB            Planning Workbench

  PWD            People With Disabilities

  PWM            Pulse-Width-Modulated

  PWV            Precipitable Water Vapor

  P_SDU          Packet Service Data Unit

  Q              Quadrature Channel

  Q/C            Quality Control

  Q/L            Quick-Look

  QA             Quality Assurance

  QA             Quality Assessment

  QA MUT         Quality Assurance Metadata Update Tool

  QA SCF         Quality Assurance Science Computing Facility

  QAM            Quadrature Amplitude Modulation

  QAWG           Quality Assuranc Working Group

  QB             Quiet Bus

  QBA            Quiet Bus Side A (For OMI)

  QBB            Quiet Bus Side B (For OMI)

  QBO            Quasi-Biennial Oscillation

  QC             Quality Control

  QCI            Quality Conformance Inspection

  QCM            Quartz Crystal Microbalance

  QDS            Quick-Look Data Set

  QLBB           Quick-Look Bulletin Board (JPL)

  QMS            Quality Management System

  QPR            Quality Project Requirements

  QPSK           Quadrature Phase Shift Keying

  QPSK           Quaternary Phase Shift Keying

  QRU            Query, Retrieve, And Update

  QT             Quality Test

  QuickSCAT      Quick Scatterometer

  QuikSCAT       Quick Scatterometer

  R              Redundancy

  R&D            Research And Development

  R&M            Reliability And Maintainability

  R&O            Routing And Operations

  R&QA           Reliability And Quality Assurance

  R-S            Reed-Solomon

  R/B            Rate Buffered

  R/L            Return Link

  R/T            Real-Time

  R/W            Read/Write

  R1             Release 1

  RA             Radar Altimeter

  RA             Right Ascension

  RA-2           Advanced Radar Altimeter (ESA)

  RAAC           Remote Active Archive Center

  RAAN           Right Ascension Of Ascending Node

  RAB            Raid Advisory Board

  RACF           Remote Access Control Facility

  RACMO          Regional Atmospheric Climate Model

  RAD            Rapid Application Development

  RADAR          Radio Direction And Range/Ranging

  Radarsat       Radar Satellite (Canada)

  RADSL          Rate-Adaptive ADSL

  RAID           Real-Time Application Interactive Debugger

  RAID           Redundant Array Of Inexpensive Disk

  RAID           Redundant Array of Independent Disk

  RAID           Redundant Array of Inexpensive Disks

  RAIT           Redundant Array Of Inexpensive Tapes

  RAL            Rutherford Appleton Laboratory (Uk)

  RALT           Radar Altimetry

  RAM            Random Access Memory

  RAMIS          Remote Access Management Information System

  RAMP           Radarsat Antarctic Mapping Program

  RAMS           Regional Atmospheric Modeling System

  RAMS           Reliability, Availability, Maintainability And Safety

  RAP            Rotating Azimuth Plane

  RARP           Reverse Address Resolution Protocol

  RARR           Range And Range Rate

  RAS            Row Address Strobe (Memory Controller Output To DRAMS)

  RASCAL         Raster Scanning Airborne Laser

  RASOT          Release A Search And Order Tool

  RAT            Remote Analysis Terminal

  RATS           RAID Array Tape System

  RB             Release B

  RB             Rate Buffered

  RBD            Rate Buffered Data

  RBD            Reliability Block Diagram

  RBR            Requirements By Release

  RC             Radiative-Convective

  RC             Release Capability

  RCC            Release Critical Contingency Iteration

  RCL            Resource Class Libraries

  RCM            Reliability Centered Maintenance

  RCM            Real-Time Contact Management Subsystem

  RCP            Right Circular Polarized

  RCP            Remote Copy

  RCS            Reaction Control System

  RCS            Request Communications Support

  RCS            Relative Command Sequence

  RCS            Revision Control System

  RCSM           Regional Climate System Model

  RCT            Release Completion Technical (Interchange Meeting)

  RCTD           Return Channel Time Delay

  RCVR           Receiver

  RCVR/PROC      Receiver/Processor

  RD             Requirements Document

  RDA            Remote Database Access

  RDA            Remote Data Access

  RDBMS          Relational Database Management System

  RDCS           Raw Data Capture Subsystem

  RDD            Return Data Delay

  RDD            Release Delivery Document

  RDE            Responsible Design Engineer

  RDET           Regulated Direct-Energy Transfer

  RDF            Resource Description Framework

  RDPS           Raw Data Processing Subsystem

  RDR            Release Design Review

  RDRAM          Rambus DRAM

  RDRs           Raw Data Records

  RDS            Rapid Spacecraft Development

  RDW            Request For Deviation/Waiver

  RE             Radiated Emissions

  REA            Rocket Engine Assembly

  REA            Reaction Engine Assembly

  REA            Request For Equitable Adjustment

  REAC           Acquisition Result

  REC            Request For Engineering Change

  REDM           Redundancy Management

  REEDM          Rocket Exhaust Effluent Diffusion Model

  REF            Reference

  REL            Release

  REP            Relativistic Electron Precipitation

  REQ            Service Request Message

  REQ            Request

  Req't          Requirement

  REQQ           Operation Request

  REQW           Weekly Request

  RESACs         Regional Earth Science Applications Centers

  RESTEC         Remote Sensing Technology Center Of Japan

  REV            Review

  REV            Revolution

  RF             Radio Frequency

  RFA            Remote File Access

  RFA            Request For Action

  RFC            Request For Comments

  RFC            Request For Change

  RFD            Request For Deviation

  RFI            Request For Information

  RFI            Radio Frequency Interference

  RFS            Request For Service

  RFS            Radio Frequency Subsystem

  RFSOC          Radio Frequency Simulation Operations Center

  RFT            Radio Frequency Terminal

  RFTS           Radio Frequency Test Set

  RGB            Red, Green, Blue

  RGMM           Reduce Geometric Math Model

  RGPS           Radarsat Geophysical Processor System

  RGS            Receiving Ground Station (ASF)

  RH             Relative Humidity

  RH             Red High

  RHC            Right-Hand Circular

  RHCP           Right-Hand Circular (Ly) Polarized

  RHS            Right Hand Side

  RICC           Remote Instrument Control Center

  RICMOS         Radiation Insensitive Complementary Metal Oxide
                 Semiconductor

  RID            Review Item Discrepancy

  RID            Reference Identification

  RIE            Remote Interface Electronics (Unit)

  RIE            Remote Interface Equipment

  RIFCA          Redundant Inertial Flight Control Assembly

  Rinex          Receiver INdependent EXchange format (GPS data)

  RIO            Reference Identifier Object

  RIP            Router Information Protocol

  RIR            Release Initiation Review

  RIS            Retro-Reflector In Space

  RIS            Requirements Information Sheet

  RIS24          24 Bit Raster Image Set

  RIS8           8 Bit Raster Image Set

  RISC           Reduced Instruction Set Computer

  RIT            Real-Time Integrated Testbed 

  RITSS          Raytheon Information Technology and Scientific Services

  RIU            Remote Interface Unit

  RIVA           Real-Time Interactive Visualization And Analysis System

  RL             Red Low

  RL             Return Link

  RLA            Repair Level Analysis

  RLAT           Radiation Lot Acceptance Test

  RLCC           Remote Launch Control Center

  RLGC           Return Link Ground Communications

  RLPC           Return Link Physical Channel

  RLPF           Return Link Processing Function

  RLPP           Return Link Physical Port

  RLRA           Reflectivity Level Reference Altitude

  RLSS           Return Link Service Session

  RM             Retrieval Manager

  RMA            Reliability, Maintainability, Availability

  RMC            Relay Matric Control

  RMI            Java Remote Method Invocation

  RMM            Risk Mitigation Model

  RMON           Remote Monitor (SNMP)

  RMP            Risk Management Panel

  RMP            Risk Management Plan

  RMS            Resource Management Software

  RMS            Resource Management Subsystem

  ROCSAT-1       Republic Of China Satellite - Flight 1

  ROD            Read-Out Discipline

  ROG            Reactive Organic Gases

  ROI            Region Of Influence

  ROLAP          Relational OLAP

  ROM            Read Only Memory

  ROM            Rough Order of Magnitude

  ROR            Read Out Register

  ROSE           Request Oriented Scheduling Engine

  ROSE           Remote Operations Service Element

  ROT            Remote On-line Terminal

  RPAF           Relative Product Access Frequency

  RPC            Remote Procedure Call

  RPC            Remote Processing Computer

  RPMA           Retarding Potential Mass Analyzer

  RPN            Reverse Polish Notation

  RPR            Restructured Program Review

  RPS            Redundant Protective System

  RPV            Remotely Piloted Vehicle

  RQMNT          Requirement

  RRDB           Recommended Requirements Database

  RRR            Release Readiness Review

  RRW            Rate Random Walk

  RS             Radiated Susceptibility

  RS             Requirements Specification

  RSA            Russian Space Agency

  RSA            Rapid Spacecraft Acquisition

  RSD            Remote Sensing Database

  RSDO           Rapid Spacecraft Development Office

  RSE            Remote Sensing Environment

  RSL            Reusable Software Library

  RSM            Replication Server Manager

  RSR            Release Specification Review

  RSS            Root Sum Squared

  RSS            Remote Sensing Systems

  RSSD           Replication Server System Database

  RST            Remote Science Terminal

  RST            Research Search Tool

  RSVP           Resource Reservation Protocol

  RT             Remote Terminal

  RT             Real-Time

  RTADS          Real-Time Attitude Determination System

  RTC            Relative Time Commands

  RTC            Remote Telemetry Command

  RTCP           Real-Time Control Protocol

  RTCS           Relative Time Command Sequence

  RTCS           Real-Time Command Sequence

  RTCU           Remote Telemetry Control Unit

  rtf            Rich Text Format

  RTHET0         A Subroutine Which Provides Thermal Data To MOLFLUX For
                 Contamination Data

  RTI            Research Triangle Institute

  Rtie           Rtworks Inference Engine

  RTM            Requirements And Traceability Management 

  RTM            Requirements Traceability Matrix

  RTM            Requirements Traceability Model

  RTR            Requirements Traceability Report

  RTRACE         Requirements Traceability Software

  RTS            Real-Time Subsystem

  RTS            Real-Time Server

  RTS            Relative Time Sequence

  RTS            Remote Tracking Station

  RTS            Real Time System

  RTSC           Relative Time Sequence Command

  RTSP           Real-Time Streaming Protocol

  RTSS           Real-Time System Simulator

  RTSW           Real Time Solar Wind

  RTTY           Radio Teletypewriter

  RUC            Re-Usable Code

  RUF            Raw Units File

  RUT-T          Raw Units Tape-TOMS

  RVC            Regional Validation Center

  RVTM           Requirements Verification Traceability Matrix

  RW             Reaction Wheel

  RWA            Reaction Wheel Assembly

  RWIC           Regional Weather Information Center

  Rx             Receiver

  RX/TX          Receiver/Transmitter (Used On 1553B Interface)

  RXO            Redundanct Crystal Oscillator

  RZ             Return To Zero

  RZ-FSK         Return To Zero - Frequency Shift Keying

  RZS            Range Zero Set

  S&E            Science And Engineering

  S&M            Structures And Mechanisms

  S&MA           Safety And Mission Assurance

  S&MS           Structures And Mechanisms Subsystem

  S-band         portion of the electromagnetic spectrum ranging from
                 1.55 to 5.2 GHz

  S-BD           S-Band

  S-GCOS         Space-Based Global Change Observation System

  S-HTTP         Secure Hypertext Transfer Protocol

  S-MIME         Secure MIME

  S-WAN          Secure WAN

  S/A            Solar Array

  S/C            Spacecraft

  S/D            Serial Digital

  S/MIME         Secure MIME

  S/N            Signal To Noise Ratio

  S/S            Subsystem

  S/W            Software

  S/WA           Software Assurance

  S/WAN          Secure WAN

  S/WCI          Software Configuration Item

  S2000          Sequoia 2000 Project

  S4P            Simple Scalable Script-Based Science Processor

  SA             Single Access

  SA             Single Access (TDRSS)

  SA             System Administrator

  SA             Selective Availability (GPS)

  SA             Solar Array

  SA             Supportability Assessment

  SAA            Solar Array Assembly

  SAA            Satellite Active Archive (NOAA)

  SAAL           Signaling Asynchronous Transfer Mode Adaptation Layer

  SAB            Science Advisory Board

  SAC            Security Access Controller

  SAC            Space Applications Corporation

  SAC-C          Satelite De Aplicaciones Cientificas-C

  SAD            Solar Array Drive

  SADA           Solar Array Drive Assembly

  SADCO          South African Data Center For Oceanography

  SADE           Solar Array Drive Electronics

  SAEF-2         Spacecraft Assembly And Encapsulation Facility

  SAES           Solar Array Electrical Simulator

  SAF            Surface And Atmospheric Flux

  SAFARI         South Africa Fire-Atmosphere Research Initiative

  SAFDS          Solar Array Fully Deployed Switch

  SAFIRE         Spectroscopy Of The Atmosphere Using Far Infrared
                 Emission

  SAFISY         Space Agency Forum On The International Space Year
                 (1992)

  SAFS           Standard Autonomous File System

  SAGE           Stratospheric Aerosols And Gas Experiment

  SAGE           Stratospheric Aerosol and Gas Experiment

  SAGE III       Stratospheric Aerosols And Gas Experiment  III

  SAI            Software Action Item

  SAIC           Science Applications International Corporation

  SAIL           Science Algorithm/Applications Implementation Language

  SAIS           Security Access Information System

  SALSA          Semi-Arid Land-Surface-Atmosphere

  SAM            Storage/Archive Management

  SAM            System Assurance Manager

  SAM            Sensing With Active Microwaves

  SAM            Space-Viewing Analog-Electronic Module (MODIS)

  SAM            Sun Aperture Mechanism

  SAM            Stratospheric Aerosol Measurement

  SAM            Systems Assurance Manager

  SAMP           Suspicious Activity Monitoring Protocol

  SAMPEX         Solar Anomalous & Magnetospheric Particle Explorer

  SAMS           Stratospheric And Mesospheric Sounder

  SAMS           Shuttle Antenna Monitoring System

  SAMS           Support And Maintenance Service

  SAMS           Stratospheric And Mesosphere Sounder

  SAN            Satellite Access Node

  SAN            Storage Area Network

  SAO            Smithsonian Astrophysical Observatory

  SAP            Service Access Protocol

  SAP            Service Access Point

  SAP            Science Advisory Panel

  SAR            Schedule And Requests

  SAR            Safety Assessment Report

  SAR            System Architecture Review

  SAR            Segmentation And Reassembly

  SAR            Schedule Add Request

  SAR            Software Assurance Requirement

  SAR            Synthetic Aperture Radar

  SARB           Surface And Atmospheric Radiation Budget

  SARR           Space Absolute Radiometric Reference

  SARSAT         SAR Satellite

  SAS            Spacecraft Analysis Software

  SAS            Statistical Analysis System

  SAS            Solar Array Simulator

  SAS            Single Attached System

  SAS            Service Accounting Segment (NCC)

  SAS-C          Scientific Applications Satellite - C

  SASS           Seasat-A Satellite-Scatterometer

  SASS           Seasat A Scatterometer System

  SAT            Site Acceptance Test

  SAT            System Acceptance Test

  SAT            Satellite

  SATAN          Security Administrator Tool For Analyzing Networks

  SATC           Software Assurance Technology Center (GSFC)

  SAVE           Solar, Atmospheric Variability Experiment

  SAVE           Southern African Validation Of EOS

  SAVI           Soil-Adjusted Vegetation Index

  SB             Standby

  SB             Survival Bus

  SBF            Spacecraft Body Fixed

  SBIU           S-Band Interface Unit

  SBRC           Santa Barbara Research Center

  SBRS           Santa Barbara Remote Sensing

  SBS            Space Background Simulator

  SBSRV          Subscription Server

  SBT            S-Band Transponder

  SBT            Subscription Tool

  SBUV           Solar Backscatter Ultraviolet

  SBUV/2         Solar Backscatter Ultraviolet Spectrometer/2

  SC             Solar Diffuser Calibration

  SC             Spacecraft

  SC-IGBP        Scientific Committee For The IGBP

  SCA            Snow-Covered Area

  SCA            Spacecraft Analyst

  SCAMA          Station Conferencing And Monitoring Arrangement

  SCAMA          Satellite Conference and Management Assembly

  SCANSAR        Scanning Synthetic Aperture Radar

  SCANSCAT       Scatterometer (Dual Pencil-Beam), Advanced Scatterometer
                 For Studies In Meteorology And Oceanography

  SCAR           Spacecraft Core Activity Request

  SCAR-B         Smoke, Clouds, And Radiation-Brazil

  SCARAB         Scanner For The Radiation Budget

  SCARABE        Scanner Radiation Budget Experiment

  SCAT           Scatterometer

  SCC            Spacecraft Control Computer 

  SCC            Spacecraft Computer

  SCC            Satellite Control Center

  SCCAB          South Central Coast Air Basin

  SCCB           Software Configuration Control Board

  SCCS           Source Code Control System

  SCD            Source Control Drawing

  SCD            Small Conversion Device

  SCDB           Spacecraft Database

  SCDM           Scan Mirror/Chopper Drive Module

  SCDR           System Critical Design Review

  SCE            Software Configuration Engineer

  SCE            Secondary Converter Electronics

  SCE            Spacecraft Command Encoder

  SCF            Science Computing Facility

  SCG            Space Communication Group

  SCH            Contact Schedule Message

  SCI            Science

  SCI            Science data stream

  SCIAMACHY      Scanning Imaging Absorption Spectrometer For Atmospheric
                 Cartography

  SCICEX         Submarine Arctic Science Cruise (Program)

  SCID           Spacecraft Identifier

  SCID           Spacecraft Identification

  SCIF           Spacecraft Interface

  SCIGN          Southern California Integrated GPS Network

  SCIL           Software Critical Items List

  SCISSAP        Southern Center For The Integrated Study Of Secondary
                 Air Pollutants

  SCITF          Spacecraft Integration And Test Facility

  SCL            Scheduling Class Libraries

  SCL            Spacecraft Command Language

  SCM            Software Configuration Management

  SCM            Schedule Confirmation Message

  SCM            Supply Chain Management

  SCM            Solar Constant Monitor

  SCMDR          Spacelift Commander

  SCMP           Software Configuration Management Plan

  SCN            Specification Change Notice

  SCN            Software Change Notice

  SCN DIR        Scan Direction

  SCO            Spacecraft And Ground Control Operator

  SCOPE          Scientific Committee On Problems Of The Environment

  SCOR           Scientific Committee For Oceanographic Research

  SCORE          Satellite Cost Reduction Study

  SCP            Standard Control Processor

  SCP            Spacecraft Processor

  SCP            Spacecraft Control Processor

  SCP            Satellite Control Processor

  SCP            Secure Copy

  SCP            Stored Command Processor

  SCP            Serial Converter Processor (ERPS component)

  SCR            Segment Completion Review

  SCR            System Concept Review

  SCR            Scripting

  SCR            Strip Cahrt Recorder

  SCR            Software Change Request

  SCS            Spacecraft Checkout Station (Terra AM-1)

  SCS            Spacecraft Service Session

  SCS            Spacecraft Contact Session

  SCS            Spacecraft Conact Summary

  SCS            Scene Creation Subsystem

  SCS            Stored Command Sequence

  SCS            Spatial Calibration System

  SCSI           Small Computer System Interface

  SCSMEX         South China Sea Monsoon Experiment

  SCT            Spacecraft Time

  SCT            System Confidence Test

  SCTC           Spacecraft Test Conductor

  SCTGEN         Simulated CCSDS Telemetry Generator

  SCTP           Screened Twisted Pair

  SCTS           Space Cargo Transportation System

  SCTT           Spacecraft Test Team

  SCW            Single Command Write

  SD             Solar Diffuser

  SD             Standard Deviation

  SD             Science Data

  SDA            Solar Diffuser Assembly

  SDB            Small Disadvantaged Business

  SDB            Spacecraft Database

  SDBC           Small Disadvantaged Business Concern

  SDC            Standard Propulsion Components

  SDCS           SAR Data Catalog System

  SDD            Software Design Document

  SDD            System Description Document

  SDD            System Design Document

  SDD            Solar Diffuser Door

  SDDU           Science Data Distribution Unit

  SDE            Software Development Environment

  SDE            Software Design Environment

  SDE            Science Data Engineering

  SDE            Spatial Database Engine

  SDF            Software Development Facility

  SDF            Software Development File

  SDF            Software Development Folder

  SDF            Science Data Formatter

  SDF/Sim        Software Development Facility/Simulator

  SDH            Synchronous Digital Hierarchy

  SDK            Software Developer's Kit

  SDL            Software Development Library

  SDM            Serial Digital Magnitude

  SDMS           Schedule and Data Management Subsystem

  SDMS           Science Data Management System

  SDN            Schedule Delete Notification

  SDOC           Science Data Operations Center

  SDP            Science Data Plan

  SDP            Software Development Plan

  SDP            Standard Data Processor

  SDP            System Development Plan

  SDP            Science Data Processing

  SDP            System Definition Phase

  SDPF           Science Data Processing Facility

  SDPF           Sensor Data Processing Facility (GSFC)

  SDPRB          Standard Data Products Resources Board

  SDPRRB         Standard Data Products Resource Requirements Board

  SDPS           Science Data Production System

  SDPS           Science Data Processing Segment (ECS)

  SDPS           Science Data Processing System

  SDPS/W         Science Data Processing Software

  SDPSW          Science Data Production Software

  SDPTK          Science Data Processing Toolkit

  SDPTK          SDP Toolkit CSCI

  SDR            Sensor Data Record (JPL)

  SDR            System Design Review

  SDR            Software Design Review

  SDR            Schedule Delete Request

  SDR            Software Discrepancy Report

  SDRI           Science Data Ready Indicator

  SDRP           Source Demand Routing Protocol

  SDS            Science Data Standards

  SDS            System Design Specification

  SDS            Scientific Data Sets

  SDSI           Simple Distributed Security Infrastructure

  SDSL           Symmetric DSL

  SDSM           Solar Diffuser Stability Monitor

  SDSO           Space Data Systems Office

  SDSRV          Science Data Server

  SDSRV          Science Data Server CSCI

  SDST           Science Data Support Team

  SDT            Segment Design Teams 

  SDTS           Spatial Data Transfer Standard

  SDU            Service Data Unit

  SDU            Software Development Unit

  SDUF           Software Development And Upgrade Facility

  SDV            Software Development And Validation

  SDVF           Software Development And Validation Facility

  SDVF           Sensor Data Validation Facility

  SDVF           SMC Service Management Center

  SE             Support Equipment

  SE             Single Event (Upset)

  SE&I           System Engineering And Integration

  SE/RC          System Evolution/Release C (ECS)

  SEA            Shunt Element Assemblies

  SEAL           Simple And Efficient Adaption Layer

  SeaPAC         SeaWinds Project (JPL)

  SEASAR         Sea Synthetic Aperature Radar

  Seasat         Sea Satellite

  SEASTAR        Spacecraft Flying Seawifs

  SeaWiFS        Sea-Viewing Wide-Field Sensor

  SeaWinds       Seawinds Scatterometer (For Flight On ADEOS II)

  SEB            Single Event Burn-Out

  SEB            Surface Energy Balance

  SEB            Source Evaluation Board

  SEBAL          Surface Energy Balance

  SEC            South Equator Crossing

  SEC            Single Edge Connect

  SEC            Sustaining Engineering Capability

  SECDEC         Single Error Correction Double Error Code

  SECDED         Single-Bit Error Correction With Double-Bit Error
                 Detection

  SECDED         Single Error Correction, Double Error Detection

  SECO           Secondary Engine Cut-Off

  SECO           Second Engine Cut-Off

  SEDAC          Socio-Economic Data And Applications Center (CIESIN)

  SEE            Single Event Effect

  SEE            Sustaining Engineering Facility (EDOS Component)

  SEEDS          Strategic Evolution of ESE Data Systems (formerly
                 NewDISS)

  SEER           System Evaluation And Estimate Of Resources

  SEF            Sustaining Engineering Facility

  SEF            Subjective Evaluation Form

  SEF            Sustaining Engineering Facility (EDOS)

  SEGR           Single Event Gate Rupture

  SEI            Software Engineering Institute

  SEI&T          System Engineering, Integration, And Test

  SEIO           Systems Engineering And Integration Office 

  SEL            Selection

  SEL            Single Event Latch-Up

  SELV           Small Expendable Launch Vehicle

  SEM            System Element Management

  SEM            Space Environmental Monitor

  SEM            Scanning Electron Microscope

  SEM            Space Experiment Module

  SEM            System Engineering Manager

  SEN            Software Engineering Notebook

  SEP            Systems Engineering Plan

  SEP            Support Electronics Package

  SEQ            Sequence

  SER            Scientific, Engineering and Research

  SER            System Engineering Report

  SERC           Science And Engineering Research Council (UK)

  SES            Scheduling And Execution Subsystem

  SES            Solid Earth Science

  SES2           Second Stage Engine Start (#2)

  SESAME         Second European Stratospheric Arctic And Mid-Latitude
                 Experiment

  SESPD          Space And Earth Science Programs Directorate (JPL)

  SET            Secure Electronic Transaction Specification

  SEU            Single Event Upset

  SEVIRI         Spinning Enhanced Visible And Infrared Imager

  SFA            Safety and Flight Assurance

  SFDU           Standard Formatted Data Unit

  SFE            Science Formatting Equipment (Terra AM-1)

  SFM            Spacecraft Fault Management

  SFM            System Fault Manager

  SFOS           Spacecraft Flight Operations Services

  SFR            Software Failure Report

  SFTP           Simple File Transfer Protocol

  SFTP           Secure-FTP

  SG             Signal Generator

  SGI            Silicon Graphic Incorporated

  SGLT           Space-Ground Link Terminal

  SGML           Standard Generalized Markup Language

  SGP            Southern Great Plains

  SGS            Svalbard Ground Station

  SGS            Spitzbergen Ground Station (Norway)

  SGS            Svalbard Ground Station (Norway)

  SH             Safety Hazard

  SHA-1          Secure Hash Algorithm 1

  SHADOZ         Southern Hemisphere Additional Ozonesondes Project

  SHEBA          Surface Heat Budget In The Arctic

  SHEBA          Surface Heat Budget Of The Arctic

  SHEDS          Spacecraft Hardware Environmental Test  Database System

  SHIA           Safety, Health and Independent Assessment

  SHM            Sun Hold Mode

  SHO            Service Schedule Order

  SHO            Spacecraft Handover

  SHO            Scheduling Orders

  SHP            Safehold Package

  SHS            Second Half Scan Error

  SI             System International d'Unites (International System Of
                 Units)

  SI             Solar Influences

  SI             Smithsonian Institution

  SI             Subinterval

  SI             ERSDAC ASTER GDS System Integrator Contractor (JGI)

  SI&P           System Integration And Planning

  SI&T           System Integration And Test

  SIAT           Spacecraft & Instrument Activation Test

  SiB            Simple Biosphere Model

  SIC            Standard Interface Connector

  SIC            Standard Industrial Classification

  SIC            Support Identification Code

  SICP           System Interface Control Plan

  SIDT           Server Interconnection Diagramming Tool

  SIF            Secondary Intermediate Frequency

  SIFP           System Implementation And Facility Plan

  SIG            Special Interest Group

  SIG            System Integration Group

  SIIS           Spacecraft/Instrument  Interface Simulator

  SIL            Solid Immersion Lens

  SIM            Simulated

  SIM            Single Interface Module

  SIM            Subscriber Identity Module

  SIM            Spectral Irradiance Monitor

  SIM            Simulation

  SIMBIOS        Sensor Intercomparison And Merger For Biological And
                 Interdiscplinary Oceanic Studies

  SIMD           Single Instruction, Multiple Data

  SIMIP          Sea Ice Model Intercomparison Project

  SIMM           Single In-Line Memory Module

  SIMMS          Scalable Integrated Multi-Mission Simulator

  SIMS           Simulations

  SINDA          System Improved Numerical Differencing Analyzer

  SIO            Scripps Institution Of Oceanography

  SIP            Standard Internet Provider

  SIPS           Science Investigator-Led Processing System

  SIR            Spaceborne Imaging Radar

  SIR            Shuttle Imaging Radar

  SIR            Sustained Information Rate

  SIR            Supplier Information Request

  SIR-B          Shuttle Imaging Radar-B

  SIR-C          Spaceborne Imaging Radar-C

  SIR-C          Shuttle Imaging Radar-C

  SIR-C/X-SAR    Spaceborne Imaging Radar-C/X-Band SAR

  SIRD           Support Instrumentation Requirements Document

  SIRD           System Interface Requirements Document

  SIRF           Scatterometer Image Reconstructive Filtering

  SIRU           Science Inertial Reference Unit

  SIS            Spacecraft Interface Simulator (Also SIIS)

  SIS            Stored Instruction Sequence

  SISEX          Shuttle Imaging Spectrometer Experiment

  SISP           Surface Imaging And Sounding Package

  SISS           Software Implementation Support System

  SISTER         Summer Institute In Science, Technology, Engineering And
                 Research

  SIT            System Implementation Team

  SIT            System Integration Test

  SITP           System Integration Test Plan

  SITUPS         Spatial Integrity Thresholding Of Urban Polygons

  SITWG          System Integration And Test Working Group

  SKIP           Simple Key Management For Internet Protocol

  SKP            Stationkeeping Platform

  SKS            commercial station

  SKS            Svalbard Kongsberg Ground Station

  SL             Scan Line

  SL             Science Liaison

  SL3            Sensitivity Level 3

  SLA            Shuttle Laser Altimetry

  SLA            Service Level Agreement

  SLAM           Spacecraft Loads And Acoustics Measurements

  SLAMS          State And Local Air Monitoring System

  SLAN           Support LAN

  SLAP           Space Link Access Protocol

  SLAR           Side-Looking Airborne Radar

  SLC            Space Launch Complex

  SLC            Spacecraft Launch Complex

  SLC-2W         Space Launch Complex - 2 West

  SLC-4E         Space Launch Complex - 4 East

  SLD            Second Level Destination

  SLD            Scan Line Data

  SLE            Single Loss Expectancy

  SLF            Space Launch Facility

  SLIES          Stratospheric Limb Infrared Emission Spectrometer

  SLIP           Serial Line Internet Protocol

  SLO            Scan Line Offset

  SLOC           Single Lines Of Code

  SLOC           Source Line Of Code

  SLR            Satellite Laser Ranging

  SLR            System Level Review

  SLR            Service Level Report

  SLS            Second-Level Source

  SLTP           System Level Test Procedure

  SLV            Standard Launch Vehicle

  SM             Structure And Mechanisms

  SM             Specification Manual

  SMA            S-Band Multiple Access

  SMA            Safety And Mission Assurance

  SMA            Semi-Major Axis

  SMA            Scan Mirror Assembly

  SMA/MA         S-Band Multiple Access/Multiple Access

  SMAF           S-Band Multiple Access Forward

  SMAR           S-Band Multiple Access Return

  SMB            Safe Mode Bus

  SMC            System Monitoring And Coordination Center

  SMC            System Management Center

  SMC            Safe Mode Controller

  SMC            Small Magellenic Cloud

  SMC            System Monitoring Center

  SMCI           System Management Configuration Item

  SMD            Standardized Manufacturing Device

  SMD            Standardized Manufacturing Drawing

  SMDS           Switched Multimegabit Data Service

  SMDS           Synchronous Multi-Megabit Data Service

  SME            Solar Mesosphere Explorer

  SMEX           Small Explorer

  SMF            Status Message File

  SMF            System Management Function

  SMF            Status Message Facility

  SMIL           Synchronized Multimedia Integration Language (XML-Based
                 for audio and video)

  SMIP           Seasonal Model Intercomparison Project

  SMIU           Safe Mode Interface Unit

  SMM            Solar Maximum Mission

  SMM/I          Special Sensor Microwave/Imager

  Smmmit         Serial m-Coded Monolithic Multi-Mode Intelligent
                 Terminal

  SMMR           Scanning Multichannel Microwave Radiometer

  SMO            Systems Management Office

  SMOBA          Stratosphere Monitoring Group Ozone Blended Analysis

  SMON           Status Monitor

  SMP            Shared Memory Processors

  SMP            Software Management Plan

  SMP            Symmetric Multi-Processor

  SMP            Symmetric Multiprocessing

  SMP            Safe Mode Processor

  SMP            Systems Management Policy

  SMPMD          Storage Management Pull Monitor Database

  SMR            System Management Review

  SMR            Specialized Mobile Radio

  SMRM           Solar Maximum Repair Mission

  SMRWG          Science And Mission Requirements Working Group

  SMS            Short Messaging Service

  SMS            Structures And Mechanisms Subsystem (Terra AM-1)

  SMS/GOES       Synchronous Meteorological Statellite/Geostationary

  SMT            Station Management

  SMT            Session Management Tool

  SMTP           Simple Mail Transport Protocol

  SMTS           Space Missile Tracking System

  SMUX           Simple Network Management Protocol Multiplexing

  SMVGEAR        Sparse-Matrix Vectorized Gear Code

  SN             Space Network

  SNA            Systems Network Architecture

  SNAP           Subnetwork Access Protocol

  SNC            Space Network Control

  SNCC           Space Network Control Center

  SNDCP          Subnetwork Dependent Convergence Protocol

  SNEWS          Secure News Server (Internet)

  SNICP          Subnetwork Independent Convergence Protocol

  SNM            Systems And Network Management

  SNMP           Simple Network Management Protocol

  SNOE           Student Nitric Oxide Explorer

  SNOTEL         Snow-Water-Equivalent Telemetered Data

  SNR            Signal-To-Noise Ratio

  SNS            Space Network Segment

  SO             Scheduling Operator

  SOAR           Spacecraft Orbital Anomaly Report

  SOC            Science Operations Center

  SOC            Simulations Operations Center

  SOC            Space Operations Center

  SOC            Status Of Charge

  SOC            Simulation Operations Center (GSFC)

  SOCB           Space Operations Control Board

  SOCC           Science Operations Control Center

  SODM           Spacecraft Operations Description Manual

  SODR           Spaceflight Optical Disk Recorder

  SOE            Spacecraft Operations Exercise

  SOE            Sequence of Events

  SOFT           Software Operations Focus Team

  SOGS           Science Operations Ground Station

  SOH            State Of Health

  SOHO           Solar And Heliospheric Observatory

  SOI            Southern Oscillation Index

  SOIs           Software Operating Instructions

  SOLAR          NASA Site For On-Line Learning Resources

  SOLAS          Surface Ocean Lower Atmosphere Study

  SOLCON         Solar Constant Radiometer

  SOLSE          Shuttle Ozone Limb Sounder Experiment

  SOLSPEC        Solar Spectrum Radiometer

  SOLSTICE       Solar Stellar Irradiance Comparison Experiment

  SOM            Space Oblique Mercator

  SOM            System Object Model

  SOMO           Space Operations Management Office

  SONET          Synchronous Optical Network

  SONEX          Subsonic Ozone And Nitrogen Experiment

  SOO            Science Operations Office

  SOP            System Operations Plan

  SOP            Standard Operating Procedures

  SOP            Start Of Packet

  SOP            Standard Operating Procedure

  SOR            System Operations Review

  SORCE          Solar Radiation And Climate Experiment

  SORD           System Operations Requirements Document

  SORR           Segment Operational Readiness Review

  SORR           Spacecraft Operations Readiness Review

  SOS            Southern Oxidants Study

  SOS            Software Only Simulator

  SOTA           Special Operations And Test Area

  SOW            Statement of Work

  SOWG           Science Operations Working Group

  SP             Service Protocol

  SP             Scenario Primitive

  SP&IO          Sensor Processing And I/O Electronics (CERES)

  SPADE          Stratospheric Photochemistry, Aerosols And Dynamics
                 Expedition

  SPAM           Spectral Analysis Manager (EDC)

  SPAN           Space Physics Analysis Network

  SPANS          Simple Protocol For Asynchronous Transfer Mode Network
                 Signaling

  SPAR           STS Payload Assurance Requirements

  SPARC          Single Processor Architecture

  SPARC          Stratospheric Processes And Their Role In Climate

  SPC            Stratospheric Polar Clouds

  SPC            Satellite Processing Center

  SPC            Serial Processor Control

  SPC            Standard Propulsion Components

  SPCR           Software Problem/Change Report (Similar To ECR But For
                 Software)

  SPCR           Software Problem Change Report

  SPCS           State Plane Coordinates Spheroid

  SPCZ           South Pacific Convergence Zone

  SPDB           Science Processing Database

  SPE            Sensor Processing Electronics

  SPE            Solar Particle Event

  SPEC           Specification

  SPF            Software Production Facility

  SPF            Single Point  Of Failure

  SPG            Single Point Ground

  SPI            Schedule Performance Index

  SPIE           Society For Photo-Optical Instrumentation Engineers

  SPIF           Shuttle POCC Interface Facility

  SPL            Science Processing Library

  SPM            Sun Pointing Mode

  SPM            Signal Processing Module

  SPN            Shared Processing Network

  SPOC           Science Planning And Operations Center

  SPOD           Suborbital Projects And Operations Directorate

  SPR            Software Problem Report

  SPR            Software Production Research

  SPR            Science Processor (Workstation)

  SPRHW          Science Processing Hardware \[Configuration Item\]

  SPS            Software Program Specification

  SPS            Serial Processor Sensor

  SPS            Service Planning Segment (NCC)

  SPS            SAR Processing System (ASF)

  SPS            Science Processing Software

  SPSC           Science Processing Support Center

  SPSH           Sun Pointing Safehold

  SPSO           Science Processing Support Office

  SPSR           Service Planning Segment Replacement

  SPSS           Science Processing Software Segment 

  SPSS           Science Planning And Scheduling System

  SQA            Software Quality Assurance

  SQL            Structured Query Language

  SQPN           Staggered Quadriphase Pseudo-Random Noise

  SQPSK          Staggered Quadra-Phase Shift Keying

  SQR            Sql Report Writer

  SQS            Spatial Query Server

  SR             Sun Rise

  SR             Site Readiness

  SRA            Slip Ring Assembly

  SRA            Site Readiness Assessment

  SRAM           Static RAM

  SRAM           Static Random Access Memory

  SRB            Systems Review Board

  SRB            Software Review Board

  SRB            Surface Radiation Budget

  SRB            Service Request Bit

  SRBEX          Susquehanna River Basin Experiment

  SRCA           Spectro-Radiometric Calibration Assembly

  SRD            Sensor Requirements Document

  SRD            System Requirements Document

  SRE            State Recognition Engine

  SREM           Software Requirements Engineering Methodology

  SRF            Service Request Framework

  SRL            Shuttle Research Laboratory

  SRM            Solid Rocket Motor

  SRM            System Resource Model

  SRM            Schedule Request Message

  SRM            Schedule Result Message

  SRM&QA         Safety, Reliability, Maintainability, And Quality
                 Assurance

  SRMC           Satellite Resources Management Center

  SRP            Science Review Panel

  SRP            Standard Repair Procedure

  SRR            System Requirements Review

  SRR            Software Requirements Review

  SRR            Site Readiness Review

  SRR            Schedule Result Request

  SRRD           Raw Data Shipment Report

  SRS            Software Requirements Specification

  SRS            Scene Request Subsystem

  SRS/GPS        Stellar Reference System/Global Positioning System

  SRT            System Readiness Test

  SRT            Science Review Team

  SRTM           Shuttle Radar Topography Mission

  SS             Space Station

  SS             Sun Set

  SS             System Storage

  SS             Seconds, Two Digit Format

  SS PCMB        Science Systems PCMB

  SSA            S-Band Single Access

  SSA            Solid State Altimeter (See EOS ALT)

  SSA            Sun Sensor Assembly

  SSAF           S-Band Single Access Forward

  SSAI           Science System Applications Incorporated

  SSALT          Solid State Altimeter

  SSAP           Science Software Archive Package

  SSAR           S-Band Single Access Return

  SSB            Space Studies Board

  SSBUV          Shuttle Solar Backscatter Ultraviolet

  SSC            Science Steering Committee

  SSC            Stennis Space Center

  SSD            Space Services Director

  SSD            Science Systems Division

  SSDD           System/Segment Design Document

  SSDM           Seas System Development Methodology

  SSDO           Science Systems Development Office

  SSE            Software Support Environment

  SSE            Subsystem Engineer

  SSEC           Space Science And Engineering Center (University Of
                 Wisconsin)

  SSEF           Spacecraft Sustaining Engineering Facility

  SSEP           Science Software Executable Package

  SSER           Simulation And Sustaining Engineering Room

  SSF            Scripps Satellite Facility

  SSF            Space Station Freedom

  SSF            System Support Function

  SSF            Single Satellite Footprint (CERES)

  SSFM           Subsystem Fault Management

  SSFMB          Space Station Freedom Manned Base

  SSG            Science Steering Group

  SSH            Secure Shell

  SSH            Sun SHield

  SSHA           System Safety Hazard Analysis 

  SSI            Science Support Interface

  SSI            Software Support Instruction

  SSI&T          Science Software Integration And Test

  SSIL           Security-Sensitivity Items List

  SSIM           Spacecraft Simulator

  SSIT           Science Software Integration And Test

  SSL            Secure Socket Layer (Protocol)

  SSL            Space Systems Laboratory

  SSM            Spacecraft Systems Manager

  SSM/I          Special Sensor For Microwave/Imager

  SSM/I          Special Sensor Microwave/Imager

  SSM/T          Special Sensor Microwave/Temperature Sounder

  SSO            Single Sign-On

  SSP            Service Support Plan

  SSP            Seawinds Standard Products

  SSPA           Solid-State Power Amplifier

  SSPA           Sensor, Solar Panel

  SSPF           Space Station Processing Facility

  SSPP           Solar Stellar Pointing Platform

  SSR            Solid State Recorder

  SSR            System Software Review

  SSR            System Specification Review

  SSR            System Safety Review

  SSR            Software Specification Review

  SSRP           Science System Release Plan

  SSRR           Software System Requirement Review

  SSS            Software Segment Specification

  SSS            Subinterval Staging Subsystem

  SSSG           Science Scheduling Support Group (US And Japan)

  SSSM           Science Software Systems Manager

  SSST           Solid State Star Tracker

  SST            Sea Surface Temperature

  SSTI           Small Spacecraft Technology Initiative

  SSTI           Smallsat Technology Initiative

  SSTRAT         Stratospheric Tracers Of Atmospheric Transport

  SSU            Stratospheric Sounding Unit

  SSW            Sudden Stratospheric Warming

  ST             Switchover Time

  ST             Star Tracker

  ST             Science Team

  STA            Science And Technology Agency (Japan)

  STA            Star Tracker Assembly

  STAAC          Systems Technology And Advanced Concepts Directorate

  STAJ           Science And Technology Agency Of Japan

  STAR           Science Team Acquisition Request

  START          System For Analysis, Research And Training

  STC            System Test Console

  STC            System Test Computer

  STCF           Short Term Data Capture Function

  STD            Software Test Document

  STD            Software Test Description

  STDN           Spaceflight Tracking And Data Network

  STDN           Spacecraft Tracking and Data Network

  STDN CTV       Stdn Compatibility Test Van

  STDN/DSN       Spaceflight Tracking And Data Network/Deep Space Network

  STDS           Short-Term Data Storage

  STE            Special Test Equipment

  STE            State Transition Engine

  STE            State Transition Editor

  STE            System Test Equipment

  STEDI          Student Explorer Demonstration Initiative

  STEP           Space Test Experiment Platform

  STGS           Station Status Info

  STGT           Second TDRSS Ground Terminal

  STIKSCAT       Stick Scatterometer 

  STIP           Short-Term Instrument Plan

  STK            Satellite Tool Kit

  STK            Satellite ToolKit

  STL            Science And Technology Laboratory

  STL            Systems Technology Laboratory

  STM            Synchronous Transfer Mode

  STM            Structural Test Module

  STM            Science Team Member

  STMD           Selectable Telemetry Display

  STMGT          Storage Management

  STMGT          Storage Management Software CSCI

  STOC           System Test and Operations Console

  STOL           System Test And Operations Language

  STOP           Short-Term Operations Plan

  STP            Software Test Plan

  STP            Short-Term Plan

  STP            System Test Plan

  STP            System Test Procedure

  STP            Startup/Terminate Program

  STP            Standard Temperature And Pressure

  StP            Software Through Pictures

  StP/OMT        Software Through Pictures/Object Modeling Technique 

  STPS           Summary Task Planning Sheets

  STPS           Simulated Telemetry Processor System

  STPS           Software Telemetry Processor System

  STPS           S-band Telemetry Processing System

  STR            System Test Review

  STR            Software Trouble Report

  STRAT          Statospheric Tracers Of Atmospheric Transport

  STREX          Storms Response Experiment

  STRS           System Technical Requirements Specification (OMI)

  STRV           Space Test Research Vehicle

  STRW           System Test Readiness Walkthrough

  STS            Space Transportation System

  STS            Short Term Schedule

  STS            Scene Transfer Subsystem

  STS-3c         Synchronous Transport System - Level 3 Concatenated

  SU             Sensor Unit

  SUB-MM         Sub-Millimeter Spectrometer

  SUCCESS        Subsonic Aircraft:  Contrail And Clouds Effects Special
                 Study

  SUM            Single Event Upset Monitor (TEDA)

  SUNY           State University Of New York

  SUPIDEN        Support Identifier

  SUR            Seamless User Registration

  SURFRAD        Surface Radiation (NOAA)

  SUROM          Start-Up Read Only Memory

  SUSIM          Solar Ultraviolet Spectral Irradiance Monitor

  SUST           Sustained

  SV             Space Vehicle

  SV             System Verification

  SV             State Vector

  SV             Space View

  SVA            Svalbard

  SVA            Space View Aperture

  SVAT           System Verification/Acceptance Testing

  SVC            Switched Virtual Circuit

  SVD            System Verification Diagram

  SVD            Space View Door (MODIS)

  SVF            Shuttle Vibration Forces

  SVI            Spectral Vegetation Indices

  SVP            Switched Virtual Path

  SVS            Space View Source (MODIS)

  SW             Software

  SW             Switch

  SW             Science Workstation

  SW             Swath

  SW/LW          Software/Long Wave

  SWAMP          Science Working Group For The AM Platform

  SWAP           Simple Workflow Access Protocol

  SWAR           Software Acceptance Review

  SWCDR          Software Critical Design Review

  SWCR           Software Concept Review

  SWCRF          Sw Cloud Radiative Forcing

  SWE            Snow Water Equivalent

  SWG            Science Working Group

  SWGD           Science Working Group On Data

  SWICD          Software Interface Control Document

  SWIL           System Wide Interface Layer

  SWIR           Short Wave Infrared

  SWIRLS         Stratospheric Wind Infrared Limb Sounder

  SWIT           Software Integration Test

  SWO            Security Watch Operator

  SWPDR          Software Preliminary Design Review

  SWRR           Software Requirements Review

  SWS            Sea Winds

  SWSI           Single Wire Serial Interface

  SWT            Science Working Team

  SWTB           Software Test Bench

  SWTR           Software Test Readiness Review

  SXI            Solar X-Ray Imager

  SYNC           Synchronization Marker (First 32 Bits In A CADU)

  SYSLOG         System Log

  T&C            Telemetry And Command

  T&CC           Telemetry And Command Console

  T&DA           Tracking And Data Acquisition

  T&F            Time And Frequency

  T&TM           Time And Time Mark

  T-S            Temperature-Salinity

  T/DC           Time/Date Conversion     

  T/EC           Tivoli Enterprise Console

  T/L            Talk/Listen

  T/V            Thermal/Vacuum

  T1             T1 Data Link, 1.5 Mbps Bandwidth

  T3             T3 Data Link, 50 Mbps Bandwidth

  TAA            Technical Assistance Agreement

  TAC            Test Analysis Controller

  TAC            Template Alignment Cube

  TAC            Telemetry And Command Computer

  TAD            Telemetry Allocation Document 

  TAD            Telemetry Allocation Document

  TAE            Transportable Applications Executive, Computer 

  TAE            Transportable Applications Environment

  TAG            Tested And Guaranteed

  TAG            Text And Graphics System

  TAI            International Atomic Time

  TAM            Three-Axis Magnetometer

  TAM            Triaxial Magnetometer

  TAO            Toga Automated Observation

  TAO            Tropical Atmosphere Ocean

  TAP            10\*\*12 Actions Per Second

  TAPI           Telephone API

  tar            Tape Archive (UNIX)(File Extension For Archived File)

  tar.Z          Compressed Tar File (UNIX)

  TARA           Two-Axis Reference Assembly (Kerfott Gyro Assembly
                 Model)

  TARFOX         Tropospheric Aerosol Radiative Forcing Experiment

  TAT            Technical Assessment Team

  TAT            Antenna Temperature Tape

  TAXI           Transparent Asynchronous Transmitter/Receiver  Interface
                 (A Chip For High Rate Data transfer)

  TAXI           Transparent Asynchronous Transmitter/Receiver Interface

  TB             Tera Byte

  TB             Terabyte (10\*\*12) 

  TBA            To Be Assigned

  TBC            To Be Continued

  TBC            To Be Completed

  TBD            To Be Determined

  TBD            To Be Defined

  TBN            To Be Numbered

  TBR            To Be Resolved

  TBR            To Be Reviewed

  TBS            To Be Supplied

  TBSW           Test Bed Software

  TBV            To Be Verified

  TBW            To Be Written

  Tbyte          Terabyte 

  TC             Thermal Control

  TC             Telecommand

  TC             Test Coordinator

  TC             Test Conductor

  TCA            Thrust Chamber Assembly

  TCA            Test Configuration Audit

  TCAD           Telemetry Checking, Analysis, and Display

  TCC            Temporary Control Center

  TCD            Test Capability Delivery

  TCL            Thermal Control Locations

  TCL            Thermal Control Location

  TCP            Transport Control Protocol

  TCP            Transmission Control Protocol

  TCP            Telemetry And Command Processor

  TCP            Tropospheric Chemistry Program

  TCP/IP         Transmission Control Protocol/Internet Protocol

  TCR            Table Change Request

  TCS            Thermal Control Subsytem (Terra AM-1)

  TCS            Thermal Control System

  TCTF           Telecommand Transfer Frame

  TCTF-ID        Telecommand Transfer Frame Identifier

  TCTS           Telemetry And Command Test Set

  TCTS           Telemetry and Command Test System

  TCXO           Temperature Controlled Crystal Oscillator

  TCXO           Temperature Compensated Crystal Oscillator

  TD             Time Date Conversion

  TD             Task Descriptor

  TD&D           Technical Data And Documentation

  TDAC           Tracking, Data Acquisition, And Communications

  TDB            Barycentric Dynamical Time

  TDD            Telecommunication Device For The Deaf

  TDE            Torque Drive Electronics

  TDE            TDRS East

  TDF            Telemetry Data Formatter

  TDM            Test Data Management

  TDM            Time Division Multiplexing

  TDMA           Time Division Multiple Access

  TDP            Technical Data Package 

  TDP            Tabular Datastream Protocol

  TDP            Telemetry Data Processing

  TDR            Temperature Data Records

  TDR            Tracking And Data Relay

  TDR            Test Discrepancy Report

  TDRS           Tracking And Data Relay Satellite

  TDRS Z         Tracking And Data Relay Satellite Zoe

  TDRS-E         Tracking And Data Relay Satellite - East (Longitude)

  TDRS-W         Tracking And Data Relay Satellite - West (Longitude)

  TDRSGS         TDRS Ground Station

  TDRSS          Tracking And Data Relay Satellite System

  TDS            TDRS-Spare

  TDSWG          Test Data Set Working Group

  TDT            Terrestrial Dynamical Time

  TDU            Telemetry Data Unit

  TDW            TDRS West

  TDZ            TDRS Z

  TE             Test Executable

  TEC            Tivoli Enterprise Console

  TECH           Technology

  TED            Total Energy Detector

  TEDA           Technical Data Acquisition Equipment (ADEOS)

  TEEGIS         TRMM End-To-End Ground Information System

  TEI            Text Encoding Initiative (Pre-Web)

  TEK            Tektronics (A Company)

  TELNET         Telecommunication Network

  TEM            Terrestrial Ecosystem Model

  TEP            TOMS Earth Probe

  Terra          Formerly Called The AM Project (Under The Earth Science
                 Enterprise Program)

  TERRIERS       Tomographic Experiment Using Radiative Recombinative
                 Inosopheric EUV And Radio Sources

  TERSE          Tunable Etalon Remote Sounder Of Earth

  TES            Tropospheric Emission Spectrometer

  TES            Temperature And Emissivity Spearation Algorithm

  TES            Temperature-Emissivity Separation

  TESS           Terra End-To-End Science System

  TESS           Terra Ete Science System

  TF             Transfer Frame

  TF             Transfer Function

  TF             Trending Facility

  TFA            Transfer Frame Assembly

  TFB            Time Frequency Bus

  TFEC           Transfer Frame Error Control

  TFG            Transfer Frame Generator

  TFN            Transfer Frame (Switching) Network

  TFN            Tribal Flood Network

  TFOV           Thermal Field Of View

  TFT            Thin Film Transistor

  Tg             Glass Transition Temperature

  TGDDIS         Trace Gas Dynamics Data And Information System

  TGM            Trace Gas Model

  TGS            Ticket Granting Service

  TGS            Time Generation System

  TGSS           TONS Ground Support System

  TGT            TDRSS Ground Terminal (Replace By NGT)

  TGT            Ticket Granting Ticket

  TGT            TDRSS Ground Terminal

  TH             Thermal Hardware

  TH             Technical Handbook

  THC            Total Hydrocarbons

  THESEO         Third European Stratospheric Experiment On Ozone

  THIR           Temperature/Humidity Infrared Radiometer (Nimbus)

  THM            Terrestrial Hydrology Model

  TIA            Thanks In Advance (Email)

  TIA            The Internet Adapter

  TIB            Test Interface Board

  TICD           Thermal Interface Control Drawing

  TICTOC         Test, Integration And Certification  Test Oversight
                 Committee

  TID            Thermal Interface Drawing

  TID            Thermal Interface Document

  TIE            Transponder Interface Electronics

  TIEnet         Trw Information Exchange Network

  TIFF           Tagged Image File Format

  TIGER          Thermal Infrared Ground Emission Radiometer

  TILDAS         Tunable Infrared Laser Differential Absorption
                 Spectrometer

  TIM            Technical Interchange Meeting

  TIM            Technical Issue Memorandum

  TIM            Total Irradiance Monitor

  TIM            The Immortal Mammoth

  TIME-GCM       Thermosphere-Ionosphere-Mesosphere-Electrodynamics
                 General Circulation Model

  TIMED          Thermosphere, Ionosphere, Mesosphere, Energetics,
                 Dynamics

  TIMS           Thermal Imaging Spectrometer

  TIMS           Technical Information Management System

  TIP            Technical Information Program

  TIR            Thermal Infrared

  TIR            Thermal Infrared Radiometer

  TIROS          Television Infrared Observation Satellite

  TIS            Test Information Sheets

  TISA           Temporal Interpolation And Spatial Averaging

  TISA           Time Interpolation And Spatial Averaging

  TISF           Tape Inventory Sequential Files (GSFC)

  TIV            Titan

  TK             Toolkit

  TKE            Thermal Knife Electronics

  TL             Team Leader

  TL             Top Level

  TLA            Three-Letter Acronym

  TLCF           Team Leader Computing Facility

  TLD            Terry L. Dunbar (Name Of Compiler And Company)

  TLE            Two Line Element (NORAD)

  TLI            Transport Library Interface

  TLM            Telemetry \[Subsystem\]

  TLM            Telemetry

  Tlm            Telemetry

  TLS            Transport Layer Security

  TLSCF          Team Leader Science Computing Facility

  TLT            Test Loop Translator

  TM             Team Member

  TM             Thematic Mapper (Landsat)

  TM             Technical Memo

  TM             Tranverse Mercator

  TM             Technical Mananger

  TM             Telemetry Manager

  TM             Trademark

  TM&F           Time Mark And Frequency

  TM2000         Test Manager 2000

  TM2K           Test Manage 2000

  TMCF           Team Member Computing Facility

  TMDB           Technical Management Database (ECS)

  TMDB           Test Management Database

  TME            Tivolo Management Environment

  TMF            Time Marked Frequency

  TMF            Trends Mnemonic File

  TMI            TRMM Microwave Imager

  TMIS           Technical Management Information System

  TML            Total Mass Loss

  TMN            Telecommunications Management Network

  TMON           Telemetry Monitor

  TMP            Transportation Management Plan

  TMR            Topex Microwave Radiometer

  TMS            Thematic Mapper Simulator

  TMT            Transition Management Team

  TMWG           Test Methodology Working Group

  TN             TDRSS Network

  TN             Transmittal Notice

  TN             Technical Note

  TNA            TDRSS Network Analyst

  TNO TPD        \"Dutch Organization, part of OMIS development team\"

  TNS            TDRSS Network System

  TO             Technical Officer

  TOA            Top Of The Atmosphere

  TOC            Table Of Contents

  TOCC           Test Operations Control Center

  TOD            True Of Date

  TOD            Time Of Day

  TOGA           Tropical Ocean Global Atmosphere

  TOGA/COARE     Toga/Coupled Ocean Atmosphere Response Experiment

  TOMS           Total Ozone Mapping Spectrometer

  TOMS           Total Ozone Mapping Spectrolab

  TOMS-EP        Total Ozone Mapping Sepctrometer-Earth Probe

  TOMUIS         3-D Ozone Mapping With Ultraviolet Imaging Spectrometer

  TONS           TDRSS On-Board Navigational System

  TOO            Target Of Opportunity

  TOP            Terrestrial Observation Panel

  TOPEX          Topography (Ocean) Experiment (Joint US-France)

  TOPORAD        (Model)

  TOPS           Tape Order Processing System (LaRC)

  TOPSAR         Topographic Synthetic Aperture Radar

  TOS            Test Operating System

  TOTE           Tropical Ozone Transport Experiment

  TOTS           Transportable Orbital Tracking System

  TOVS           Tiros Operational Vertical Sounder

  TOVS           Television And Infrared Observation Satellite
                 Operational Vertical

  TOY            Time Of Year

  TP             Transaction Processing

  TP             Test Procedure

  TP FEM         Two Phase Finite Element Model

  TPCE           Telemetry Processing Control Environment

  TPF            Two Phade Flow

  TPFO           TOPEX Follow-On Flight

  TPI            Tracks Per Inch

  TPM            Technical Performance Measurement

  TPM            Technical Performance Monitoring

  TPOCC          Transportable Payload Operations Control Center

  TPS            Test Procedure Report

  TQCM           Thermoelectric Quartz Crystal Microbalance

  TQM            Total Quality Management

  TQSM           Telemetry Quality and Status Monitoring

  TR             Tape Recorder

  TR             Transmit Receive

  TRACE          Tropical Atmospheric Chemistry Experiment

  TRACE-A        Transport And Chemistry Near The Equator Over The
                 Atlantic

  TRACE-B        Transport And Chemistry Near The Equator-Atlantic (2nd)

  TRACER         Tropospheric Radiometer For Atmospheric Chemistry And
                 Environmental Research

  TRAGNET        United States Trace Gas Network

  TRAK           Data Request, Tracking System (NSIDC)

  TRAMAR         Tropical Rain Mapping Radar

  TRASYS         Thermal Radiation Analyzer System

  TRAYSYS        Thermal Radiation Analyzer Program

  TRB            Test Review Board

  TRCN           Teacher Resource Center Network

  TREM           Tropical Rainfall Explorer Mission

  TRFIC          Tropical Rain Forest Information Center

  TRIS           Tropical Region Imaging Spectrometer

  TRK            Tracking

  TRMM           Tropical Rainfall Measuring Mission (Joint US-Japan)

  TRMM           Tropical Rainfall Measuring Mission

  TRR            Test Readiness Review

  TRR            Test Result Report

  TRR            Test Requirements Report

  TRS            Tape Recorder Subsystem

  TRS            Test Record Sheet

  TRUST          TDRSS Resource User Support Terminal

  TRW            Test Readiness Walkthrough

  TRW            Thompson Ramo-Woolridge

  TS             Test System

  TS             Test Surveillance

  TS             Thermal Subsystem

  TS             Transport System

  TS             Thermally And Structurally Representative

  TS             Transport Subsystem (ECOM)

  TSA            Time And Space Averaging

  TSC            Tanegashima Space Center (Japan)

  TSCA           Toxic Substances Control Act

  TSDF           Treatment, Storage And Disposal Facility

  TSDIS          TRMM Science Data And Information System

  TSF            Thermally, Structurally, And Functionality
                 Representative

  TSG            Technical Support Group

  TSI            Total Solar Irradiance

  TSIM           Total Solar Irradiance Mission

  TSIWG          Technical Security Implementation Work Group

  TSN            TRMM Science Network

  TSP            Thrift Savings Plan

  TSP            Twisted Shielded Pair

  TSS            Telecommunications Standards Sector

  TSS            Thermal Synthesizer System

  TSS            TDRSS Service Session

  TSS            TDRSS Service Summary

  TSS            EOSDIS TRMM Support System

  TSS            TRMM Support System

  TST            TRMM Science Terminal

  TST            Technology Strategy Team

  TST            TRMM Science Team

  TSTAT          Thermostat

  TSTOL          TRMM System Test And Operations Language

  TSU            Tsdis Science User

  TSU            TRMM Science User

  TSW            TDRSS Scheduling Window

  TSWG           TRMM Science Working Group

  TT             Trouble Ticket

  TT&C           Telemetry, Tracking, And Command

  TT&C           Telemetry, Tracking And Control

  TT&C           \"Telemetry, Tracking and Command\"

  TT&C           \"Telemetry, Tracking and Control\"

  TT-GPTS        Table Top-Ground Power Test Set

  TTAU           Teletex Access Unit

  TTC            TT&C Group Equipment Support And Maintenance

  TTL            Transistor-Transistor Electronics

  TTM            Time Transfer Message

  TTR            Trouble Tracking Report

  TTY            Teletype

  TURFTS         TDRSS User Radio Frequency Test Set

  TUT            TDRSS Unscheduled Time

  TV             Thermal Vacuum

  TVA            Tennessee Valley Authority

  TVDB           Test Verification Database

  TW             Target Week

  TWP            Tropical Western Pacific Ocean

  TWT            Traveling Wave Tube

  TWTA           Traveling Wave Tube Amplifier

  TWTA           Travelling Wave Tube Amplifier

  TWTAS          Traveling Wave Tube Amplifier System

  TXCO           Temperature Compensated Crystal Oscillator

  TXT            ASCII Text

  TZD            Total Zenith Delay

  U.K.           United Kingdom

  U.S.           United States

  U/C            Upconverter

  U/D            Update

  U/I            User Interface

  U/L            Uplink

  UA             User Agent

  UABC           Universidad  Autónoma De Baja California

  UAF            University Of Alaska, Fairbanks

  UAM            Urban Airshed Model

  UARP           Upper Atmosphere Research Program

  UARS           Upper Atmosphere Research Satellite

  UAV            Unmanned Aerospace Vehicle

  UAV            User Antenna View

  UAV            Uncrewed Aerial Vehicles

  UBR            Unspecified Bit Rate

  UC             University Of California

  UC             Upconverter

  UCAID          University Corporation For Advanced Internet Development
                 (Abilene Network)

  UCAR           University Corporation For Atmospheric Research

  UCB            University of Colorado at Boulder

  UCE            Unit Check-Out Equipment

  UCLA           University Of California, Los Angeles

  UCS            Uniform Communications Standard

  UCSB           University Of California, Santa Barbara

  UDB            User Data Base

  UDF            Unit Development Folder

  UDP            User Datagram Protocol

  UDP            User Data Protocol

  UDP/IP         User Datagram Protocol/Internet Protocol

  UDSL           Universal DSL

  UE             University of Edinburgh

  UEL            Upper Explosive Limit

  UFP            Url Filtering Protocol

  UFS            UNIX File System

  UHF            Ultra-High Frequency

  UIA            User Interface Adapter (Or Unit)

  UIA            Unassigned Integer Arithmetic

  UID            Universal Identifier

  UIID           Unique Instrument Interface Document

  UIL            User Interface Language

  UINT16         16-Bit Unsighned Integer Type

  UINT32         32-Bit Unsighned Integer Type

  UINT64         64-Bit Unsighned Integer Type

  UINT8          8-Bit Unsighned Integer Type

  UIOAR          User Interface Off-Line Analysis Request

  UIT            User Interface Terminal (ESA)

  UK             United Kingdom

  UKMO           United Kingdom Meteorological Office

  UL             Upper Left

  UMAC           Upper Midwest Aerospace Consortium

  UMBC           University of Maryland at Baltimore City

  UMCP           University Of Maryland, College Park

  UML            Universal Modeling Language

  UMTS           Universal Mobile Telecommunications System

  UN/ECE         United Nations Economic Commission For Europe

  UNCED          United Nations Conference On Environment And Development

  UNEP           United Nations Environmental Programme

  UNESCO         United Nations Educational Scientific And Cultural
                 Organization

  UNESS          University-Based Education Earth System Science

  UnESS          University Earth System The Science

  UNH            University Of New Hampshire

  UNI            User Network Interface

  UNICOS         Unix Cray Operating System

  UNIX           Common Operating System For Scientific Applications

  UofT           Universityof Toronto

  UOS            User Operations Support

  UPD            User Performance Data

  UPDM           User Performance Data Message

  UPDR           User Performance Data Request

  UPGD           Upgrade

  UPM            User Performance Message

  UPN            Unique Project Identifier

  UPS            Uninterruptable Power Supply

  UPS            Uninterruptable Processing System

  UPS            User Planning System

  UPS            User Profile System

  UQPSK          Unbalanced Quadriphase Shift Key/Keying

  UR             Universal Reference

  UR             User Requirement

  UR             Upper Right

  UR/PT          User Registration/Profile Tool

  URD            User Requirements Document

  URDB           User Registration DB

  URDB           User Recommendation Database

  URF            User Request File

  URFA           User Request File Acknowledgment

  URISA          Urban And Regional Information Systems Association

  URL            Uniform Resource Locator

  URL            Universal Resource Locator

  URL            Universal Reference Location

  URL            Universal Reference Locator

  URN            Uniform Resource Name

  URT            User Registration Tool

  US             User Station

  US             Unsigned

  US             United States of America

  USAF           United States Air Force

  USB            Universal Serial Bus

  USCCS          User Spacecraft Clock Calibration System

  USDA           United States Department Of Agriculture

  USDC           United States Department Of Commerce

  UserDIS        User Data Information System

  USFC           United States Forest Service

  USFWS          U.S. Fish And Wildlife Service

  USGCRP         U.S. Global Change Research Program

  USGS           U.S. Geological Survey

  USM            User Schedule Message

  USN            Universal Space Network

  USNO           United States Naval Observatory

  USO            User Support Office

  USO            Ultra Stable Oscillator

  USRA           University Space Research Associates

  USS            User Services Subsystem

  USS            User Services System

  UT             Umblical Tower

  UT             Universal Time

  UT             Upper Troposphere

  UT             Unit Testing

  UT             University Of Texas

  UTC            Coordinated Universal Time

  UTCF           Universal Time Correlation Factor

  UTCSR          University of Texas Center for Space Research

  UTDF           Universal Tracking Data Format

  UTH            Upper Tropospheric Hunidity

  UTM            Universal Transverse Mercator

  UTMC           Universal Time Master Clock

  UTP            Unshielded Twisted-Pair

  UU             Uuencoded/Decode

  UUID           Universal Unique Identifier

  UUT            Unit Under Test

  UV             Ultraviolet

  UV             Under Voltage

  UV             Ultra Violet

  UV-B           Ultraviolet-B

  UV1            1st Ultra Violet (Channel)

  UV2            2nd Ultra Violet (Channel)

  UVISI          Ultraviolet And Visible Imagers And Spectrographic
                 Imagers

  UVn            Under Voltage level n

  UWA            University Of Washington

  UWG            Users Working Group

  UWG            Utilities Working Group

  UWI            University Of Wisconsin

  UX             Unix/X

  V              Verified

  V&H            Vertical And Horizontal

  V&V            Verification And Validation

  V/O            Visualization Option

  V/T            Voltage/Telemetry

  V/T            Voltage Temperature (charge curve)

  V0             Version 0 (Version Zero; Use V-0 For EDHS Search)

  V0             Version 0 (Version Zero)

  V0 GTWY        Version Zero Gateway

  V0 ODL         Version 0 Object Description Language

  V0.1           Version 0.1

  V1             Version 1

  V2             EDOS Release Version 2, Initial Operations Demonstration

  V2             Version 2

  V3             Version 3

  V3             EDOS Release Version 3, Operational Prototype

  V3P            Version 3 Prototype

  V4             Version 4

  VA             Virginia

  VAC            Vacuum

  VAFB           Vandenberg Air Force Base

  VAN            Value-Added Network

  VAP            Value Added Provider

  VAR            Value-Added Resellet

  VAS            Vissr Atmospheric Sounder (GOES)

  VAT            Verification Acceptance Test

  VATC           Verification And Acceptance Test Center (Raytheon @
                 Landover)

  VAX            Virtual Extended Address

  VBD            Vector Borne Disease

  vBNS           very high-speed Backbone Network Service

  vBNS           Very High Speed Backbone Network Service

  VBR            Variable Bit Rate

  VBR-NRT        Variable Bit Rate - Non Realtime

  VBR-RT         Variable Bit Rate - Realtime

  VC             Virtual Channel

  VC-ID          Virtual Channel Identifier

  VCATS          Vendors Costing And Tracking System (ECS)

  VCC            Virtual Channel Connection

  VCC            Vehicle Command Count

  VCC            Vegetative Cover Conversion

  VCDU           Virtual Channel Data Unit

  VCDU-ID        VCDU Identifier

  VCF            Vegetation Continuous Fields

  VCGW           Virtual Channel Gateway

  VCHP           Variable Conductance Heat Pipe

  VCI            Virtual Channel Identifier

  VCID           Virtual Channel Identification

  VCID           Virtual Channel Identifier

  VCL            Vegetation Canopy Lidar

  VCM            Volatile Condensable Materials

  VCP            Virtual Control Panel

  VCR            Video Cassette Recorder

  VCRI           Verification Cross Reference Index

  VCRM           Verification Cross Reference Matrix

  VC_PDU         Virtual Channel (Protocol) Data Unit

  VDA            Vacuum Deposited Aluminum

  VDB            Verification Database

  VDC            Volts, Direct Current

  VDC            Visual Database Cookbook

  VDD            Version Description Document

  VDE            Valve Drive Electronics

  VDS            Voice And Data System

  VDS            Vehicle Dynamics Simulation

  VDSL           Very High-Data-Rate Dsl

  VDSL           Voice Distribution System

  VDT            Video Display Terminal

  VE             Verification

  VEM            Vibro Elastic Material (Damping Treatment)

  VEMAP          Vegetation/Ecosystem Modeling And Analysis Project

  VER            Version

  VF             Valley Forge, Pa

  VFD            Very Fast Delivery

  VFS            Virtual File System

  VGA            Video Graphics Adapter (IBM)

  VHF            Very High Frequency

  VHRR           Very High Resolution Radiometer

  VHS            Vertical Head Synchronization

  VHS            VME High-Rate Subsystem

  VHSIC          Very High Speed Integrated Circuit

  VI             Vegetation Index

  VIC            Vehicle Identification Code

  VIC            Variable Infiltration Capacity

  VID            Video

  VID            Vehicle Identification Number

  VIIRS          Visible And Infrared Imaging Radiometer Suite

  VIMS           Virtual IMS

  VIP            Versatile Interface Processor

  VIRGO          Variability Of Solar Irradiance And Gravity Oscillations

  VIRR           Visible And Infrared Radiometer

  VIRS           Visible Infrared Scanner (TRMM)

  VIRSR          Visible Infrared Scanning Radiometer

  VIS            Vendor Information System 

  VIS            Visible

  VIS-UV         Visible/Ultraviolet Spectrometer

  VIS/IR         Visible/Infrared

  VISSR          Visible/Infrared Spin-Scan Radiometer (GOES)

  VLAN           Virtual Local Area Network

  VLBI           Very Long Baseline Interferometry

  VLDB           Very Large Database

  VLINK          Visited Link (HTML)

  VLIW           Very Long Instruction Word

  VLM            Very Large Memory

  VLS            Vandenburg Launch Site

  VLS            VME Low-Rate Subsystem

  VLSI           Very Large Scale Integration

  VM             Virtual Machine

  VM             Virtual Memory

  VME            Versa Module Eurocard

  VMIC           VME Microsystems International Corp (A Company)

  VML            Vibration Monitor Limiter

  VML            Vector Markup Language

  VMR            Volume Mixing Ratio

  VMS            Virtual Memory System

  VN             Verified Near-Term

  VNIR           Visible And Near Infrared

  VOB            Version Object Base

  VOC            Volatile Organic Compounds

  VOC            Voltage Open Circuit

  VOC            Volatile Organic Carbon

  VOD            Video-On-Demand

  VoIP           Voice Over IP

  VOLCAM         Volcanic Ash Mission

  VOM            Volt Ohm Meter

  VOTE           Vortex Ozone Transport Experiment

  VOTE/TOTE      Vortex Ozone Transport Experiment/Tropical Ozone
                 Transport Experiment

  VP             Verification Plan

  VP             Virtual Path

  VP/VC          Virtual Path, Virtual Channel

  VPF            Vector Product Format

  VPI            Virtual Path Identifier

  VPN            Virtual Provate Network

  VRAM           Video Random Access Memory

  VRML           Virutal Reality Modeling Language

  VS             Verification Specification

  VSAM           Virtual Storage Access Method

  VSAR           Variable Synthetic Aperture Radar

  VSAT           Very Small Aperture Terminal

  VSIO           Very High Speed Serial Interface

  VSS            Voice Switching System

  VT             Virtual Terminal

  VT             Verification Test

  VTCW           Vehicle Time Code Word

  VTIR           Visible And Thermal Infrared Radiometer

  VTP            Virtual Terminal Protocol

  VTRS           Vandenberg Telemetry Receiver Site

  VTS            Virtual Terminal Service

  VUE            Visible-Light/Ultraviolet Experiment

  VVRM           Verification And Validation Requirements Matrix

  VW             Verified With Workaround

  VXI            VME Bus Extension For Instrumentation (Extension Of VME)

  VXR            Visible Transfer Radiometer

  W              Watts

  W/B            Wideband

  W3             World Wide Web

  W3C            World Wide Web Consortium (International Organization
                 For Developing Web standards)

  W3J            World Wide Web Journal (Published By W3C)

  WA             Working Agreement

  WAD            Work Authorization Document

  WAIS           Wide Area Information Server

  WAN            Wide Area Network

  WAN            Workaround

  WAP            Wireless Access Protocol

  WASDE          World Agricultural Supply And Demand Estimates

  WB             Wideband

  WBDCS          Wide Band Data Collection System

  WBDT           Wide Band Downlink Transmitter

  WBDT           Wideband Downlink Transmitter

  WBEM           Web-Based Enterprise Management

  WBS            Work Breakdown Structure

  WBVT           Wide Band Video Tape

  WC             Wls Calibration

  WCOM           Worldcom

  WCRP           World Climate Research Program (Combined
                 Ocean-Atmosphere Research Experiment)

  WCS            White Sands Complex

  WCSC           Western Commercial Space Center

  WDC            World Data Center

  WDC-A          World Data Center-A

  WDE            Wheel Drive Electronics

  WDETI          Workforce Development Education And Training Initiative

  WDM            Wavelength Division Multiplexing

  WDOG           Watchdog Timer (see also WDT)

  WDS            Watch Dog Sequencer

  WDT            Watch Dog Timer

  WDT-O          Watch Dog Time-Out

  WEFAX          Weather Facsimile (Via Geosynchronous Weather
                 Satellites)

  WEGENER        Working Group Of European Geoscientists For The
                 Establishment of Networks for Earthquake Research

  WEPOLWX-81     Weddell Polyna Experiment

  WETNET         Network For Distribution And Joint Analysis Of SSM/I
                 Data (MSFC)

  WFC            Visible Wide-Field Camera

  WFF            Wallops Flight Facility

  WfMC           Workflow Management Coalition

  WFOV           Wide Field Of View

  WFPC           Wide Field Planetary Camera

  WFPS           Water-Filled Pore Space

  WG             Working Group

  WGD            Working Group On Data (CEOS)

  WGGCR          Working Group On Global Change Research

  WGISS          Working Group On Information Systems And Services

  WGM            Working Group Meeting

  WGNE           Working Group On Numerical Experimentation (WCRP)

  WGS            Wallops Ground System (EPGS And WPS) Designator For All
                 Orbital Tracking Resources Located At GSFC/WFF

  WGS            Wallops Ground Station

  WGS            World Geodetic Survey

  WGS84          World Geometric System '84

  WHOI           Woods Hole Oceanographic Institute

  WHOM           Web-based Hierarchical Ordering Mechanism

  WIDL           Web Interface Definition Language

  WIL            Weilheim Ground Station

  WINDII         Wind Imaging Interferometer

  WINTEL         Microsoft Windows And Intel-Compatible

  WIPO           World Intellectual Property Organization

  WIRE           Wide-Field Infrared Explorer

  WK             Week

  WKBCH          Workbench

  WKBCH          Workbench CI

  WKBCH          Workbench CSCI

  WKSHCI         Working Storage Hardware Configuration Item

  WKSHW          Working Storage Hardware

  WLL            Wireless Local Loop

  WLS            White Light Source

  WMO            World Meteorological Organization

  WMON           Wavelength Monitor

  WN             Window Channel Radiometric Data

  WOCE           World Ocean Circulation Experiment

  WORM           Write Once Read Many

  WORM CD        Write Once, Read Many Compact Disk

  WOTIS          White Sands Orbital Tracking Information System

  WOTIS          White Sands Orbital Tracking and Information System

  WOTS           Wallops Orbital Tracking Station  (Obsolete Term)

  WOW            Weight On Wheels

  WP             White Paper

  WP             Work Package

  WP-3           Work Pacakge 3

  WP-ESIP        Working Prototype - Earth Science Information Partner

  WPL            Wave Propagation Laboratory (NOAA)

  WPS            Designator For All Orbital Tracking Resources Located At
                 GSFC/WFF

  WPS            Wallops Ground Station

  WQRC           Water Quality Conservation Board

  WR             Western Range

  WR             Work Requests

  WRKSTN         Workstation

  WRR            Western Range Regulations

  WRS            Worlwide Reference System

  WRS            Worldwide Reference System

  WS             Working Storage

  WS             Workstation

  WSC            White Sands Complex

  WSG            Wallops Scheduling Group

  WSGT           White Sands Ground Terminal

  WSGTU          White Sands Ground Terminal Upgrade

  WSMC           Western Space And Missile Center

  WSMC           Western Space Missile Command

  WSP            Web Standards Project

  WSR            Weather Survelliance Radar

  WTF            Wgiss Test Facility

  WTI            Warehouse Technology Initiative

  WTO            World Trade Organization

  WTR            Western Test Range

  WTS            Wallops Tracking Station

  WVR            Water Vapor Radiometer

  WVU            West Virginia University

  WWW            World Wide Web

  WWW            World Weather Watch

  WYSIWYG        What You See Is What You Get

  X              X Protocol

  X-band         portion of the electromagnetic spectrum ranging from
                 5.2--10.9 GHz

  X-Band CTV     X-Band Compatibility Test Van (A JPL Van Used To Verify
                 X-Band Compatibility)

  X-BD           X-Band

  X-SAR          X-Band Synthetic Aperture Radar

  X.400          OSI Standard For Mail Services

  X.500          OSI Standard For Directory Services

  XA             X/Open Api

  xAR            X Acquisition Request (Where X Is A Generic Acquisition
                 Request)

  XBDS           Bulk Data Service Protocol

  XBT            Expendable Bathythermograph

  XDR            External Data Representation

  XDR            External Data Format

  XDS            X/Open Directory Service

  XF             Transfer Frame

  XF             Transformer (Used On 1553B Interface)

  XFG            Transfer Frame Generator

  XFN            X/Open Federated Naming

  XFR            Transfer

  XFS            Extended File System

  XHTML          Extensible Hyper Text Markup Language

  XIE            X-Ray Imaging Experiment

  XLFD           X Logical Font Description (X Window System)

  XLink          Extensible Link Language (Xll)

  XLL            Extensible Link Language

  XMI            XML Metadata Interchange Format (IBM, Unisys)

  XML            Extensible Markup Language

  XML-QL         XML Query Language

  XMM            X-Ray Multi Mirror

  XMP            X/Open Management Protocol

  XMT            Transmit

  XMTR           Transmitter

  XOM            X/Open Osi-Abstract-Data Manipulation

  XPDR           Transponder

  XPNDR          Transponder

  XPointer       XML Pointer Language (Addressing Scheme, See Also XLL)

  XPS            Xuv Photometer System

  XRS            X-Ray Spectrometer

  XSL            Extensible Style Language

  XSLP           Xsl Processor

  XTE            X-Ray Timing Explorer

  XTRR           External Interface Test Readiness Review

  XTX            X-Band Transmitter Assembly

  Y2K            Year 2000

  YAHOO          Yet Another Hierarchically Officious Oracle (Internet)

  YGC            Yaw Gyro Compassing

  YH             Yellow High

  YL             Yellow Low

  YTD            Year To Date

  YYYY           Year, Four Digit Format

  Z              UNIX Compressed Format

  Z              Zulu Time

  ZBR            Zero-Based Review

  ZIF            Zero Insertion Force

  ZIP            File Extension For Compressed Files (PK Ware)

  Zmail          UNIX Mail Tool

  ZMB            Zero Momentum Bias

  ZOE            Zone Of Exclusion

  ZWD            Zenith Wet Delay
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