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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 Samuel N. Goward, UMDDarrel L. Williams, NASA/GSFCAndrew Macatee, UMD Members: USGS/NASA Landsat Science Team
Global Land Remote Sensing in Landsat 7 Era Year 2000 L7 “low-cloud” Coverage – USGS EROS
Map Quality Imageryfrom Remote Sensing • Land Surface Conditions • Orthorectified (DEMs) • Surface Reflectance (Atmosphere) • Cloud and Shadow-Free
May 11 May 27 June 12 June 28 July 14 July 30 Cloud Contamination ProblemL7 16-Day Temporal Repeat – Washington DC region, 2000
May 19 June 04 June 20 July 06 July 22 Aug 07 Cloud Contamination(L7 16-Day Temporal Repeat – Oregon region, 2000)
ACCA 16% 02JUN02
ACCA 5% 10JUN02
ACCA 13% 18JUN02
ACCA 10% 26JUN02
ACCA 2% 04JUL02
ACCA 0% 12JUL02
ACCA 71% 20JUL02
ACCA 10% 28JUL02
ACCA 19% 05AUG02
ACCA 0% 13AUG02
ACCA 55% 21AUG02
ACCA 90% 29AUG02
ACCA 0% 06SEP02
ACCA 80% 14SEP02
ACCA 54% 22SEP02
ACCA 10% 30SEP02
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
August 2002 No Data
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