# Presentation: 709613

## Current MODIS Data System:Processing, Archiving and Distribution 

- Shaida Johnston
- July 13, 2004

## Contents

- Overview of MODIS data system
- What are the current MODIS products?
- Where are MODIS products processed?
- Which data products are in the MODIS archives?
- Through what mechanisms are MODIS data distributed?
- What tools and services are available to MODIS data users?
- Who can one contact with questions?
- Acronym list

## MODIS Data Flow 

-  Process L0

**GES DAAC**

- Ingest L0,
- Archive &
- (Re)Process
-  L1

- Ingest
- GMAO Data

**GMAO**

**MODAPS**

- (Re)Process
- L2+

**SCFs**
- L2+
- Validation** **

**GES DAAC**

**LP DAAC**

- Archive &
- Distribute L1,
- Ocean SST,
- Atmosphere L2+
-  and GMAO,
- ancillary data

- Archive &
- Distribute
- Land Data

**DAACs**

- GMAO
- Data

- L0 Data
- 72 GB

- Ancillary
- Data

- L1,
- L2+
- Data

- L1
- Data

- QA
- Metadata
- Update

- QA
- Metadata
- Update

- L1 Data
- 220 GB

- GMAO &
- Ancillary Data

- L2+
- Data
- 410 GB

- Data Products

- MODIS Data Flow

- UMD(3)
- GSFC(3)
- UMiami

**NOAA/**
**Bent Pipe**
- at GSFC

- Ocean Color Products

- BU(2)
- UCSB

- RT Users

- Data volumes represent forward processing
- of 1 MODIS instrument (1x) per day

## Current Products - Level 1

## Current Products - Atmosphere 

## Current Products - Land

## Current Products - Cryosphere& Intermediate Land

## Terra Ocean Products Feb. 2000 - Jan. 2004

- Terra Ocean Products Feb. 2000 - Jan. 2004

*****

*****

*** ****Feb. 2004 - Present**

## Ocean (Standard) Product Parameters

- 1  	nLw_412/Normalized water-leaving radiance at 412 nm
- nLw_443/Normalized water-leaving radiance at 443 nm
- nLw_488/Normalized water-leaving radiance at 488 nm
- nLw_531/Normalized water-leaving radiance at 531 nm
- nLw_551/Normalized water-leaving radiance at 551 nm
- nLw_667/Normalized water-leaving radiance at 667 nm
- nLw_678/Normalized water-leaving radiance at 678 nm
- Tau_869/Aerosol optical thickness at 869 nm
- Eps_78/Epsilon of aerosol correction at 748 and 869nm
- aer_model1/Aerosol model identification number 1
- aer_model2/Aerosol model identification number 2
- eps_clr_water/Epsilon of clear water aerosol correction at 531 and 667 nm
- CZCS_pigment/Chlorophyll-a + pheopigment (fluorometric, empirical)
- chlor_MODIS/Chlorophyll-a concentration (HPLC, empirical)
- pigment_c1_total/Total pigment concentration (HPLC, empirical)
- chlor_fluor_ht/Chlorophyll fluorescence line height
- chlor_fluor_base/Chlorophyll fluorescence baseline
- chlor_fluor_effic/Chlorophyll fluorescence efficiency
- susp_solids_conc/Total suspended matter concentration in ocean
- cocco_pigmnt_conc/Pigment concentration in coccolithophore blooms

- cocco_conc_detach/Detached coccolithophore concentration
- calcite_conc/Calcite concentration
- K_490/Diffuse attenuation coefficient at 490 nm
- phycoeryth_conc/Phycoerythrobilin concentration*
- 25 	phycou_conc/Phycourobilin concentration
- chlor_a_2/Chlorophyll-a concentration (SeaWiFS analog - OC3M)
- chlor_a_3/Chlorophyll-a concentration (semianalytic)
- Ipar/Instantaneous photosynthetically available radiation
- Arp/Instantaneous absorbed radiation by phytoplankton for fluorescence
- absorp_coef_gelb/Gelbstoff absorption coefficient at 400 nm
- chlor_absorb/ Phytoplankton absorption coefficient at 675 nm
- tot_absorb_412 /Total absorption coefficient at 412 nm
- tot_absorb_443 /Total absorption coefficient at 443 nm
- 34 	tot_absorb_488/Total absorption coefficient at 488 nm
- 35 	tot_absorb_531/Total absorption coefficient at 531 nm
- 36 	tot_absorb_551/Total absorption coefficient at 551 nm
- 37  	SST (daytime), 11 μm
- 38 	SST (daytime), 4μm
- 39 	SST (nighttime), 11 μm
- SST (nighttime), 4 μm
- 	Angstrom_531/ Angstrom coefficient, 531-869 nm

- * Not maintained

## MODIS Data Processing

- Level 1

- Ocean

- Atmosphere

- Land

- Cryosphere

## Archives of MODIS Data

- Data Pools*

- Ocean

- Atmosphere

- Level 1

- Land

- Cryosphere

- *Data Pools are ‘rolling’ archives of fresh or high-interest data on disk

## Product Collections (Reprocessing Events)

**2000**

**2003**

**2004**

**2001**

**2002**

- Coll.  3

- Collection 1

- Collection 4

**Terra**

**Aqua**

- Solid Color=Reprocessing
- Dashed Color=Forward Processing
- Dates represent **Data** Dates

- Collection 4

**2005**

**2006**

**2007**

**2008**

**2009**

- Collection 5

- Collection 6

- Collection 7

- Collection 5/Combined

- Collection 6/Combined

- Collection  3

- Collection 7/Combined

## Distribution Mechanisms

## In the Works

- EOSDIS Clearing HOuse ECHO
- MODIS granules to populate by 8/04 at LP DAAC
- Open Data Access Protocol (Open DAP, formerly DODS)
- L3 & L4 gridded data accessible
- http://daac.gsfc.nasa.gov/services/dods/DODS.html
- Supports subsetting
- Matlab and IDL Clients
- MODIS On-line Visualization and Analysis System (MOVAS)
- On-line atmospheres data
- Emphasis on time series
- Subsetting capability
- Near-Archive Data Mining (Experimental)

## Data Tools Available for Users

- _[http://](http://edcdaac.usgs.gov/datatools.asp)__[edcdaac](http://edcdaac.usgs.gov/datatools.asp)__[.](http://edcdaac.usgs.gov/datatools.asp)__[usgs](http://edcdaac.usgs.gov/datatools.asp)__[.](http://edcdaac.usgs.gov/datatools.asp)__[gov](http://edcdaac.usgs.gov/datatools.asp)__[/](http://edcdaac.usgs.gov/datatools.asp)__[datatools](http://edcdaac.usgs.gov/datatools.asp)__[.asp](http://edcdaac.usgs.gov/datatools.asp)_
- _[http://nsidc.org/data/tools/](http://nsidc.org/data/tools/)_
- MODIS Reprojection Tool (MRT)
- MODIS Land Data Operational Evaluation (LDOPE)
- MODIS Swath Reprojection Tool (MRT Swath)
- MODIS Atmospheres Tools
- MODIS Swath-to-Grid Toolbox (MS2GT)
- HDF-EOS to GeoTIFF Conversion Tool (HEG)
- HEW Subsetting Appliance (HSA)

## Data Access

**EOS Data Gateway (EDG)** - _[http://](http://redhook.gsfc.nasa.gov/~imswww/pub/imswelcome/)__[redhook](http://redhook.gsfc.nasa.gov/~imswww/pub/imswelcome/)__[.](http://redhook.gsfc.nasa.gov/~imswww/pub/imswelcome/)__[gsfc](http://redhook.gsfc.nasa.gov/~imswww/pub/imswelcome/)__[.](http://redhook.gsfc.nasa.gov/~imswww/pub/imswelcome/)__[nasa](http://redhook.gsfc.nasa.gov/~imswww/pub/imswelcome/)__[.](http://redhook.gsfc.nasa.gov/~imswww/pub/imswelcome/)__[gov](http://redhook.gsfc.nasa.gov/~imswww/pub/imswelcome/)__[/~](http://redhook.gsfc.nasa.gov/~imswww/pub/imswelcome/)__[imswww](http://redhook.gsfc.nasa.gov/~imswww/pub/imswelcome/)__[/pub/](http://redhook.gsfc.nasa.gov/~imswww/pub/imswelcome/)__[imswelcome](http://redhook.gsfc.nasa.gov/~imswww/pub/imswelcome/)__[/](http://redhook.gsfc.nasa.gov/~imswww/pub/imswelcome/)_
**NSIDC EDG:**  http://www.nsidc.org/~imswww/pub/imswelcome/
**WHOM (for GES DAAC)** - _[http://](http://daac.gsfc.nasa.gov/data/)__[daac](http://daac.gsfc.nasa.gov/data/)__[.](http://daac.gsfc.nasa.gov/data/)__[gsfc](http://daac.gsfc.nasa.gov/data/)__[.](http://daac.gsfc.nasa.gov/data/)__[nasa](http://daac.gsfc.nasa.gov/data/)__[.](http://daac.gsfc.nasa.gov/data/)__[gov](http://daac.gsfc.nasa.gov/data/)__[/data/](http://daac.gsfc.nasa.gov/data/)_
**GES DAAC MODIS Data Support** - http://daac.gsfc.nasa.gov/MODIS/
**LP DAAC** - http://edcdaac.usgs.gov/main.asp
**Mosaic of MOIDS Veg. Indices** - http://seamless.usgs.gov
**NSIDC** - http://nsidc.org/data/modis/
**NSIDC data pool:**  http://www.nsidc.org/data/data_pool/
**SNOWI**:  http://www.nsidc.org/data/snowi/
**MODIS SNOWI:**  http://www.nsidc.org/data/modis_snowi/
**Ocean Color** - http://oceancolor.gsfc.nasa.gov

## Contacts

## Acronyms

- BRDF - Bidirectional Reflectance Distribution Function
- BU - Boston University
- DAAC - Distributed Active Archive Center
- ECHO - EOSDIS Clearing HOuse
- ECS - EOSDIS Core System
- EDG - EOS Data Gateway
- EDOS - EOS Data Operations System
- EOS - Earth Observing System
- EOSDIS - Earth Observing System Data Information System
- ESDIS - Earth Science Data and Information System (Project)
- FDD - Flight Dynamics Division
- FPAR - Fraction of absorbed Photosynthetically Active Radiation
- FTP - File Transfer Protocol
- GES DAAC - Goddard Earth Science DAAC
- GMAO - Global Modeling and Assimilation Office
- GSFC - Goddard Space Flight Center
- HDF - Hierarchical Data Format
- HEW - HDF-EOS Web-based subsetter
- L0, L1, L2, L3, L4 - Level 0,1, 2, 3, 4 (processing levels)
- LAI - Leaf Area Index

- LDOPE - Land Data Operational Evaluation
- LP DAAC - Land Processes DAAC
- MCST - MODIS Characterizaton Support Team
- MODAPS - MODIS Adaptive Processing System
- MODIS - Moderate Resolution Imaging Spectroradiometer
- MTMGW - Machine-to-Machine Gateway
- NOAA - National Oceanographic and Atmospheric Administration
- NSIDC - National Snow and Ice Data Center
- OBC- On-board Calibrator
- OC - Ocean Color
- OCDPS - Ocean Color Data Processing System
- QA - Quality Assurance
- SCF - Science Computing Facility
- SDST - Science Data Support Team
- SST - Sea Surface Temperature
- UCSB - University of California, Santa Barbara
- UMD - University of Maryland
- USGS - United States Geological Survey
- WHOM - Web Hierarchical Ordering Mechanism