# Presentation: 326162

## Summary ofNPP Land Science Team Meeting:Status, Progress, Issues 

- Jeffrey Privette
- MODIS Land Team Meeting
- January 5, 2006
- Baltimore

## Program and VIIRS Sensor States

- NPOESS Program under replan due to cost/schedule overruns
- Announcement of plan forward expected in ~Feb. ‘06
- Some launch date slippage likely
- VIIRS is critical path, and receiving the attention consistent with that
- Two major concerns in past year appear on path to 100% resolution
- Stray light  on solar diffuser during calibration, and cryoradiator performance
- NPP very likely moving to 1330 orbit
- Cross validation opportunities with A-Train
- Cloudiness analysis of a.m. vs. p.m.: roughly a draw
- Aqua younger than Terra:  theoretically still operational at NPP launch

## Recent NASA Team Activities

- Land PEATE is up and running
- Internal Peer Review completed in Dec. 2005
- Architectural design stable and under active procurement
- NPOESS Science-grade algorithms debugged and ported
- NPOESS Operational algorithm “wrapper” making good progress
- Strong interaction with IDPS & CLASS on segment interfaces, data formats, intermediate and QA products, etc. definitions
- Conveying EOS lessons learned
- Regular interactions with other PEATEs
- Build 1 on schedule for March 2006 completion
- 8 MODIS PGE (cloud mask, AOT, surf refl., VI, NCEP & LCover granulation, fires, ...)
- 1.2 orbits of VIIRS Proxy Data converted from SSPR drop
- Receive Calibration LUTs from NICSE (Jack Xiong’s calibration team at GSFC)
- Etc.
- Build 2 scheduled for November 2006 completion
- Includes working interfaces with IDPS and CLASS elements

## Recent NASA Team Activities

- NASA Land Team provided results/advice to partners & community
- AGU 2005 Fall Meeting Special Session (22 contributions; December)
- VIIRS OAT Meetings (February and September)
- NPOESS Algorithm Executability Review by IPO and NGST (August)
- NPP Orbit Position Paper (August)
- Algorithm Risk Documents (NPP Project; June)
- Land PEATE Review (September, December)
- JARG NPOESS Data Source Review (October)
- VIIRS Proxy Transform Drop to SSPR (MODIS-to-VIIRS; November)
- SSPR Biweekly Land Telecons initiated in November 2005
- Drill down into complex and/or esoteric algorithm topics
- Direct “scientist-to-scientist” interaction, conveying EOS lessons-learned
- Six held to date (e.g., surface reflectance, VI compositing, (re-)gridding)
- Follow Early Algorithm Assessments delivered in 2004

## VIIRS Proxy Data Partnership

- Transform eqns

- MIR/LWIR
- Transform eqns

- Convolved AIRS
- Spectral Data Base

**NGST**

**GMU**

**NASA’s****GSFC**

**U Arizona**

- IDPS System
-  Testing & Analysis

**NASA’s**
**Land PEATE**

-  NPOESS Algorithm
- Analysis &
- Improvement

**Notes:**
 Here are some of the VIIRS proxy data collaborations
 George Mason Univ has made a database from MODIS & VIIRS simulations from AIRS data, which they will present in the next talk
 We have focused on mid- and longwave-IR spectral transformations
 Univ of Arizona has made visible and near-infrared spectral transformations
 We are using the George Mason database and we will make our transformations available to NGST for use in future proxy data sets
 We will also make the transformations available to the NASA Science Data Segment for algorithm testing

## Proxy Data Provides “True Data” Realism

**MODIS Data**
- Band 32 (12 um , Δ0.5)
- Sahara Desert, Libya

**VIIRS Proxy Data**
- Band M16 (12 um, Δ0.95)

**MOD****-****VIIRS Spectral Transformation Equation****M16 = a + b*31 + c*32 + d*(31-32)(sec(viewz)-1)**

**Validation**:
- Real AVHRR vs.
- MODIS-derived proxy AVHRR

**Notes:**
Here’s an example of converting a MODIS scene to VIIRS for VIIRS band M16 (12 um).
This is a desert scene
The VIIRS transformation uses a combination of MODIS band 31 and MODIS band 32 and view zenith angle

## Team Issues

- IDPS may have limited xDR production at NPP Launch
- IPO/SSPR replan emphasizes (L1) Sensor Data Records (SDRs)
- EDRs likely to be added incrementally over the life of NPP
- Gap in mainstay NASA products (e.g., NDVI, Fire)?
- Most Intermediate Products (internal to IDPS) not archived in CLASS
- NASA community uses many for research and/or
- 	product validation (e.g., TOC NDVI, monthly gridded NDVI, BRDF, etc.)

## Team Issues

- Onboard pixel aggregation system does not record if input values(s) are saturated
- Detectors used for fire detection saturate at low temperatures
- Jeopardizes quality of fire detection EDR
- Remedy straightforward:  downlink one M15 unaggregated
- Early SSPR cost projection seemed unrealistic
- Launch delay and lobbying may allow good sense to prevail

## To Be Determined...

- 3 general types NPP data users envisioned in NASA community
- ESDRs/CDRs (high quality, high latency; source: NASA CARS)
- e.g., large scale climate and modeling communities
- Swath EDRs (operational quality, low latency; source: IDPS)
- e.g., applications, wildfire support
- Gridded EDRs (operational quality, low latency; source: TBD)
-  e.g., FEWS
- NPOESS EDRs are like EOS L2 Swath Products rather than the gridded L3 products preferred by NASA Science community
- “Value added” processing is needed (stitching, compositing, QA, etc.)
- NOAA developing NPOESS Data Exploitation effort for op users
- NASA needs something similar for its products/users

## Backup

- Land algorithms not applied to pixels indentified as cloud contaminated
- MODIS applies alg everywhere; cloud info put in accompanying data layer
- Operational users prefer not to check multiple layers (reportedly)
- Misses potential opportunities to get useful information
- Cloud algorithm may not be accurate, especially over snow/ice regions
- Some EDR algorithms remain accurate despite presence of clouds
- Not all EDRs may be affected – under investigation