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Cloud Contamination in Landsat Imagery: Cloud-Clearing with LTAP-8

Cloud Contamination in Landsat Imagery: Cloud-Clearing with LTAP-8. Samuel N. Goward, UMD Darrel L. Williams, NASA/GSFC Andrew Macatee, UMD Members : USGS/NASA Landsat Science Team. Global Land Remote Sensing in Landsat 7 Era. Year 2000 L7 “low-cloud” Coverage – USGS EROS.

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Cloud Contamination in Landsat Imagery: Cloud-Clearing with LTAP-8

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  1. Cloud Contamination in Landsat Imagery: Cloud-Clearing with LTAP-8 Samuel N. Goward, UMDDarrel L. Williams, NASA/GSFCAndrew Macatee, UMD Members: USGS/NASA Landsat Science Team

  2. Global Land Remote Sensing in Landsat 7 Era Year 2000 L7 “low-cloud” Coverage – USGS EROS

  3. Map Quality Imageryfrom Remote Sensing • Land Surface Conditions • Orthorectified (DEMs) • Surface Reflectance (Atmosphere) • Cloud and Shadow-Free

  4. May 11 May 27 June 12 June 28 July 14 July 30 Cloud Contamination ProblemL7 16-Day Temporal Repeat – Washington DC region, 2000

  5. May 19 June 04 June 20 July 06 July 22 Aug 07 Cloud Contamination(L7 16-Day Temporal Repeat – Oregon region, 2000)

  6. ACCA 16% 02JUN02

  7. ACCA 5% 10JUN02

  8. ACCA 13% 18JUN02

  9. ACCA 10% 26JUN02

  10. ACCA 2% 04JUL02

  11. ACCA 0% 12JUL02

  12. ACCA 71% 20JUL02

  13. ACCA 10% 28JUL02

  14. ACCA 19% 05AUG02

  15. ACCA 0% 13AUG02

  16. ACCA 55% 21AUG02

  17. ACCA 90% 29AUG02

  18. ACCA 0% 06SEP02

  19. ACCA 80% 14SEP02

  20. ACCA 54% 22SEP02

  21. ACCA 10% 30SEP02

  22. Smallsat Constellations? GEOSS? Conceptual Ground Imaging tracks from a Constellation of 4 Polar and 1 Equatorial Satellites. Hansen, M, T. Loveland, et al, A Constellation of Mixed-Orbit Micro-Satellites for Monitoring Global Land Change and Ecosystem Dynamics, SDSU& USGS EROS

  23. June 2002

  24. July 2002

  25. August 2002 No Data

  26. September 2002

  27. Cloud/Shadow Clearingthrough Scene Merging • GOAL • Combine 2 or more scenes to produce a merged clear land observations (not image compositing). • APPROACH • atmospheric adjustment • cloud/shadow identification • land/water mask • “stable” land surface conditions • QUALITY ASSURANCE • Scatter plot evaluation

  28. June 2nd (red) June 18th (blue)

  29. June 28th (blue) August 13th (red)

  30. July 4th (red) August 5th (blue)

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