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

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

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

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  1. Summary ofNPP Land Science Team Meeting:Status, Progress, Issues Jeffrey Privette MODIS Land Team Meeting January 5, 2006 Baltimore

  2. 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

  3. 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

  4. 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

  5. VIIRS Proxy Data Partnership NGST Convolved AIRS Spectral Data Base IDPS System Testing & Analysis GMU MIR/LWIR Transform eqns NASA’sGSFC NPOESS Algorithm Analysis & Improvement VIS/NIR Transform eqns U Arizona NASA’s Land PEATE

  6. Proxy Data Provides “True Data” Realism MOD-VIIRS Spectral Transformation EquationM16 = a + b*31 + c*32 + d*(31-32)(sec(viewz)-1) VIIRS Proxy Data Band M16 (12 um, Δ0.95) MODIS Data Band 32 (12 um , Δ0.5) Sahara Desert, Libya Validation: Real AVHRR vs. MODIS-derived proxy AVHRR

  7. 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.)

  8. 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

  9. 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

  10. 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

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