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Land Products from NPP and NPOESS

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Land Products from NPP and NPOESS

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    1. Land Products from NPP and NPOESS Jeffrey L. Privette NPP Deputy Project Scientist Dan Tarpley NOAA/NESDIS 27 October 2005

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    6. 6 VIIRS Thermal: Fewer, Wider Bands

    7. 7 Land EDRs Use Most Bands

    8. 8 VIIRS Products Continue Heritage

    9. 9 Heritage: AVHRR’s First Land Products Global Vegetation Index (8 km weekly, GVI; NOAA) Top-of-atmosphere composited NDVI only Operational GIMMS (8 km, 15 day; NASA), and Pathfinder I (8 km 10 day; NASA/NOAA) NDVI with some atmospheric correction Multimission cross-calibration, solar angle normalization Post-processed FASIR (1°, monthly; NASA) GIMMS-derived + Leaf Area Index, Absorbed Radiation (FPAR) and albedo Post-processed

    10. 10 Heritage: MODIS “Operationalized” Land

    11. 11 VIIRS Surface Reflectance IP

    12. 12 MODIS atmospheric correction

    13. 13 VIIRS Vegetation Indices EDR

    14. 14

    15. 15 VIIRS Surface Albedo EDR

    16. 16 MODIS Albedo: Always Gridded

    17. 17 VIIRS Land Surface Temperature

    18. 18 MODIS Land Surface Temperature

    19. 19 VIIRS Fire “Application”

    20. 20 MODIS Fire Product

    21. 21 VIIRS Surface Type EDR

    22. 22

    23. Some Changes From Heritage

    24. 24 Reduced Pixel Growth Along Scan

    25. 25 Few EDRs Are Gridded or Gap-filled

    26. 26 Land EDR Validation: Tough but Critical

    27. 27 EOS Validation: Years, Ongoing Provisional – Product quality may not be optimal and incremental product improvements are still occurring Validated -- Product uncertainties are well defined over a range of representative conditions ready for use in scientific publications, and by other agencies there may be later improved versions. There are three validation stages: Stage 1 Validation: Product accuracy has been estimated using a small number of independent measurements obtained from selected locations and time periods and ground-truth/field program effort. Stage 2 Validation: Product accuracy has been assessed over a widely distributed set of locations and time periods via several ground-truth and validation efforts. Stage 3 Validation: Product accuracy has been assessed and the uncertainties in the product well established via independent measurements in a systematic and statistically robust way representing global conditions.

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