# Presentation: 027418

## NPP/NPOESS Update

**Jeff Privette**
**NASA GSFC, **_**Code 614.4**_
**March 24, 2005**

## Schedule: Launch Delay Forthcoming

- NPP Schedule Replan Revision underway
- Previous Replan drafted in August 2004
- Continues early integration of EDUs on s/c for electronics (1394) and communications testing
- Following tests, EDUs are uninstalled and returned to vendors
- Reduces risk before FU availability
- Likely launch slip:  > 1 year, from Oct. ’06 baseline
- Official launch date will be determined in final Replan

## Sensors: VIIRS is Critical Path

- VIIRS (IPO procurement)
- Critical Path sensor
- Cryoradiator:  launch locks contributed to thermal short and were single point failure risks
- Earth-Shine:  “pure” solar irradiance onto onboard solar diffuser likely contaminated by radiance reflected off earth
- NASA estimates contamination component is double that for MODIS (~2-4%)
- Would cause out-of-spec calibration performance
- LW Focal Plane cross-talk concern
- Component-level testing could not confirm compliance with required performance
- Awaiting system integration for conclusive testing
- OMPS (IPO procurement)
- Main mirror on nadir profiler sensor sent back for regrind
- CrIS (IPO procurement)
- EDU 3 recently completed thermo-vac testing, great comeback
- ATMS (NASA procurement)
- Essentially ready to go

## Cal/Val:  New Approach

- IPO named Dr. Karen St. Germain to take leadership
- Testing and validation requirements and plans will be tracked through online task matrix software (CasaNOSA)
- comments/concerns/responses to be formally tracked
- IPO requesting population of this matrix by internal/external scientists and engineers
- Priorities: 1) prelaunch testing, 2) on-orbit checkout, 3) SDR/EDR validation plans

##  Intermediate Products
Parameters not identified in IORDII, System specification, etc.
Not subject to performance requirements
SSPR not obligated to send to CLASS
Original SSPR baseline: 2 IPs will be archived in CLASS
Cloud Mask
VIIRS Quarterly Gridded Surface Type
NASA and OATs requested additional IPs
NGST appears willing to compromise if resources allow
Quality Assurance Flags
NASA recently reviewed plan and provided feedback to NGST
Consensus opinion: too many flags, more thought needed

- Parameters not identified in IORDII, System specification, etc.
- Not subject to performance requirements
- SSPR not obligated to send to CLASS
- Original SSPR baseline: 2 IPs will be archived in CLASS
- Cloud Mask
- VIIRS Quarterly Gridded Surface Type
- NASA and OATs requested additional IPs
- NGST appears willing to compromise if resources allow
- Quality Assurance Flags
- NASA recently reviewed plan and provided feedback to NGST
- Consensus opinion: too many flags, more thought needed

**Intermediate Products, QA Flags:****Movement, But More Work Needed**

## Data Processing:  IDPS Build 1.3 Progressing

- IDPS Build 1.3 currently underway
- Algorithm sci-to-ops code conversions are small part of system
- Dropped algorithms intended to be “form stable” (i.e., at-launch algorithmic theoretical approach)
- Build 1.4 in 2005 intended to be incremental
- primarily LUT updates
- Some algorithm work moved from 1.3 to 1.4
- Aggressive drop schedule led to some incomplete algorithm deliveries
- Build 1.4 must now include more substantial algorithm work than planned
- Major NPP proxy data set will test IDPS
- Will be available through Land PEATE (more later)

## NPP Mission Segments

***Space Segment***

**NPP CCSDS**
**Application Packets**

## SDS Level 1 Requirements: Assess, Improve

- SDS has no operational data production responsibilities (2.1.2.1) or any other operational responsibilities (2.1.2) ...
- “In developing the SDS, the Project shall assume that EDRs produced by IDPS are climate quality.”
- “The role of the SDS is limited to assess the quality of NPP EDRs for accomplishing climate research.” (2.1.2)
- SDS provides suggested algorithm improvements to the IDPS (2.1.2.3)
- The NASA NPOESS Preparatory Project (NPP) Mission Success Criteria indicates that Mission Success is based on continuing the Scientific Data Record
- SDS will be capable of processing selected data subsets in order to conduct independent analysis in support of Cal/Val Activities (2.2.2)
- SDS is a science-discipline-based system, leveraging existing resources for design, development, implementation and operations (2.1.2.4)
- SDS will be built with FY04-FY06 NPP Project funding ($10M) and Congressional ear marked funds ($8.5M-6%) for a total cost of $17.9M during this time period
- SDS operates during the NPP mission lifetime
- Post-check-out (FY07 through end-of-mission) source of funds for this operation are not identified

## NASA Science Data Processing Model

**NASA Science Data Processing Model**

**Land Measurement Team**

**Ocean Color **
**Measurement Team**

**Ozone **
**Measurement Team**

**Clouds/Aerosol Measurement Team**

**Sounder IR/uwave Measurement Team**

## Science Data Segment (SDS):  Good Progress

- June ’04 SDS Design Review approved by HQ
- SDS funds now available for Project spending
- PEATES Under Construction
- PEATES are NPP-funded augmentations to existing processing facilities designed to support Science Team assessments of S/EDRs
- Discipline-specific (e.g., land, ozone, oceans...)
- MODAPS designated the Land/Atmosphere PEATE
- SD3 system (ingest and rolling 30-day archive) expected to be available for test and check-out in summer ‘05

## SDS Block Diagram

**SDS Block Diagram**

- IPO / IDPS

- NOAA / CLASS

- RDRs
- SDRs
- EDRs

- RDRs
- SDRs
- EDRs

- SD3

- I/T System

- NPP PEATE

- CARS: Ocean Color

- CARS: Land

- NPP PEATE

- CARS: Atmosphere

- NPP PEATE

- CARS: Ozone

- NPP PEATE

- CARS: Sounder

- NPP PEATE

**NPP Science Team**

- Project Science Office

- NICST

- Network
- Infrastructure

- SDS Components

**McClain, Charles**
**Wang, Menghua**
**Minnett, Peter**
**Justice, Christopher**
**Loveland, Thomas**
**Lyapustin, Alexei**
**Maslanik, James**
**Privette, Jeffrey**
**Ranson, Jon**
**Schaaf, Crystal**
**Vermote, Eric**
**Wolfe, Robert**
**Baum, Bryan**
**Han, Qingyuan**
**Menzel, Paul**
**Stamnes, Knut**
**Torres, Omar**
**McPeters, Richard**
**Pagano, Thomas ****Fishbein, Evan**
**Revercomb, Henry**
**Lambrigtsen, Bjorn**
**Staelin, David**
**Strow, Larrabee**

**PEATE: **
**Product Evaluation &Test Element**

## VIIRS Issues and ConcernsFor Land

**Contributions from the NPP ST Land Group**
**24 March 2005**

## Fires:  Known Instrument Issues

**VIIRS band-to-band registration varies within an orbit due to thermal changes (STOP analysis)**
**<10% band-to-band deviation needed for accurate temperature and area**
**The VIIRS thermal band (M15; 11 microns) saturation is too low for routine fire characterization (343 K vs. 400 K for MODIS).**
**Temp and area cannot be retrieved with saturated M15.**
**As designed instrument will not meet current product specification for fire size and temperature**** **
**VIIRS onboard M15 aggregation scheme does not set a flag when one or more of the detectors was saturated**
**Physically invalid, corrupted M15 radiances will sometimes be passed to the algorithm, with no memory of faulty input**
**Impacts multiple EDRs (approx. 15)**
**Proposed solution:**
_**Download full resolution pre-aggregated M15 data**_
_**UMD/Justice currently studying potential of this approach**_

## Fire:  Continuity of EOS Fire Radiative Power (FRP)

**Addition of *****fire radiative power***** (FRP) to the product suite was proposed by the contractor and VOAT**
**ECR rejected**
**FRP will be an important addition **
**FRP is related to the rate of combustion and will help contribute to emissions and fire impact studies.**
**Allows for direct calculation of combusted biomass.**

**Wooster et al. from field measurements **

- Fire Radiative Energy vs. Mass Combusted

## Albedo:  Providing MODIS Lessons Learned

**2 algorithms executed, 2 products created**
**Regression tree (Liang et al.; no op. heritage)**
**Adapted kernel-driven BRDF model (some MODIS heritage)**
**Baseline BRDF algorithm picks “best” of multiple kernel (shape function) combinations**
**Tested, tried, and rejected under MODIS**
**Multi-kernels work when there is equal probability of each kernel being selected at each location**
**Not a valid assumption due to orbit/scanning geometry and variable cloudiness**
**Difficult to exploit BRDF IP due to pixel-dependent model**
**Lesson learned is not being transitioned into operations**
**NASA Science Team position submitted to IPO/NGST in Feb.**
**NGST will consider and call follow-up meeting**

## LST:  Dual-Split Window Lack Heritage

**Daytime dual-split window algorithm**
**         **
**         **
**Nighttime dual-split window algorithm**
**    **
**Split window algorithm (back-up) **

- * Index *i* represents surface type

## Daytime VIIRS LSTs for a MODIS Scene

**Daytime VIIRS LSTs for a MODIS Scene**

**VIIRS Split LSTs**

**Time:     06/07/2004,  20:55-21:00 UTC**

##   VIIRS LST Difference from MODIS LST

**  ****VIIRS LST Difference from MODIS LST**

**Time: 06/07/2004, 20:55-21:00 UTC**

**VIIRS Split LST *****vs*****. MODIS LST**

**VIIRS Dual-split LST *****vs*****. MODIS LST**

## LST:  Upshot

**Mean Error over 60 Daytime MODIS Scenes (>17M pixels):****	**
**	****	****	****	****	****Mean (K)****	**** Std. Dev. (K)**
**	****VIIRS Split Window Algorithm: ****	****	****0.69****	****1.05**
**	****VIIRS Dual-Split Window Algorithm:****	****1.35**** ****	****1.76**
**Impacts of the LST error in further applications **
**	****0.5 K error    ******** 10% error of sensible heat flux (*****Brutsaert et al., 1993*****)**
**	****1.0 K error ******** 10% error of evapotranspiration (*****Moran and Jackson, 1991*****)**
**	****1-3 K error ******** 100 W/m^2 error of surface heat flux (*****Kustas and Norman, 1996*****)**
**Dual-split window LST limitations**
**	****Sunglint area  (reverted to the single split window algorithm)**
**     ****	****High Surface Emissivity Variance**
**     ****	****Lack of physics explanation**
**     ****	****Inconsistency of the algorithm**
- Across sunglint/non glint area
- Day vs. night
- Inconsistent with AVHRR, MODIS time series – inadequate for Climate Data Record
**                       **

| MWIR |  | TIR |  |
| --- | --- | --- | --- |
| Band 22 | Band 23 | Band 31 | Band 32 |
| 0.8023 ~ 0.9848 | 0.7843 ~ 0.9844 | 0.9656 ~ 0.9913 | 0.9709 ~ 0.9911 |

- Finding:
- VIIRS Backup Algorithm
- is superior to Main

## Sensor Vendor Planned Multiple VI Products

## SSPR’s VI Products:  PCR for TOC NDVI

## Back-ups