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C ontinuity of the Web Enabled Landsat Data (WELD) Product Record in the Landsat 8 Era D avid Roy, Valeriy Kovalskyy, Indrani Kommareddy Geographic Information Science Center of Excellence, South Dakota State University, USA Landsat Science

  1. C ontinuity of the Web Enabled Landsat Data (WELD) Product Record in the Landsat 8 Era D avid Roy, Valeriy Kovalskyy, Indrani Kommareddy Geographic Information Science Center of Excellence, South Dakota State University, USA Landsat Science Team Meeting, USGS EROS Center, Sioux Falls, USA 29-31 October 2013

  2. Current Status of NASA funded WELD activities

  3. Free Landsat distribution concept WELD ( black lines = data via ftp, colored lines = data on DVD media) Data Flows WELD distribution - FTP HDF WELD - WYSIWY GeoTiff L1T • Historical and contemporary Landsat data will be sent on a routine basis from the US. • The data will be distributed for free on DVD media from the African offices using national registered delivery postal services in response to user email and written requests. • An exit strategy that identifies the pathway to transition the project to operational partners and/or using alternative distribution strategies will be developed in year 3 to help ensure sustained free Landsat data access for African users.

  4. 10 years of CONUS and Alaska products (40TB) online at EROS >0.5 million files, >130TB, have been distributed to >1200 users

  5. New NASA 5-year Funding Landsat 5: 1984 to June 2013 Landsat 3: 1978 to 1983 Landsat 7: 1999+ Landsat 2: 1975 to 1982 Landsat 6 Landsat 4: Landsat 1: Landsat 8 1982 to 1993 1972 to 1978 Feb. 2013+ WELD process 30m Landsat TM & ETM+ Global Archive

  6. Global Landsat Processing Need fast computer, fast I/O, big disk NASA Earth Exchange (NEX) Data Repository COMPUTING COLLABORATION (over 400 TB of data) (9PB, 180,000 cores) (over 250 members) ARC 9PB on-line storage, 50PB tape storage • 180,000 total available cores •

  7. Data Flows Free Landsat distribution concept ( black lines = data via ftp, colored lines = data on DVD media) WELD U.S & Global distribution - FTP HDF - WYSIWY GeoTiff WELD L1T U.S. WELD Global • Historical and contemporary Landsat data will be sent on a routine basis from the US. • The data will be distributed for free on DVD media from the African offices using national registered delivery postal services in response to user email and written requests. L1T • An exit strategy that identifies the pathway to transition the project to operational partners and/or using alternative distribution strategies will be developed in year 3 to help ensure sustained free Landsat data access for African users.

  8. Global WELD prototype, Landsat 7 ETM+, 7300 May 2010 acquisitions, processed on NASA Earth Exchange (NEX) Supercomputer MODIS Land Sinusoidal Projection 1.8km TOA true color browse, each browse pixel generated from 60 x 60 30m pixels MODIS Land Sinusoidal Projection

  9. Global WELD prototype, Landsat 7 ETM+, 7300 May 2010 acquisitions, processed on NASA Earth Exchange (NEX) Supercomputer MODIS Land Sinusoidal Projection 1.8km TOA true color browse, each browse pixel generated from 60 x 60 30m pixels MODIS Land Sinusoidal Projection

  10. Global WELD prototype, Landsat 7 ETM+, 7300 May 2010 acquisitions, processed on NASA Earth Exchange (NEX) Supercomputer MODIS Land Sinusoidal Projection 1.8km TOA true color browse, each browse pixel generated from 60 x 60 30m pixels MODIS Land Sinusoidal Projection

  11. Global WELD prototype, Landsat 7 ETM+, 7300 May 2010 acquisitions, processed on NASA Earth Exchange (NEX) Supercomputer MODIS Land Sinusoidal Projection 1.8km TOA true color browse, each browse pixel generated from 60 x 60 30m pixels MODIS Land Sinusoidal Projection

  12. Global WELD prototype, Landsat 7 ETM+, 7300 May 2010 acquisitions, processed on NASA Earth Exchange (NEX) Supercomputer MODIS Land Sinusoidal Projection 1.8km TOA true color browse, each browse pixel generated from 60 x 60 30m pixels MODIS Land Sinusoidal Projection

  13. Global WELD prototype, Landsat 7 ETM+, 7300 May 2010 acquisitions, processed on NASA Earth Exchange (NEX) Supercomputer MODIS Land Sinusoidal Projection 1.8km TOA true color browse, each browse pixel generated from 60 x 60 30m pixels MODIS Land Sinusoidal Projection

  14. Global WELD prototype, Landsat 7 ETM+, 7300 May 2010 acquisitions, processed on NASA Earth Exchange (NEX) Supercomputer MODIS Land Sinusoidal Projection 1.8km TOA true color browse, each browse pixel generated from 60 x 60 30m pixels MODIS Land Sinusoidal Projection

  15. Global WELD prototype, Landsat 7 ETM+, 7300 May 2010 acquisitions, processed on NASA Earth Exchange (NEX) Supercomputer MODIS Land Sinusoidal Projection 1.8km TOA true color browse, each browse pixel generated from 60 x 60 30m pixels MODIS Land Sinusoidal Projection

  16. Global WELD prototype, Landsat 7 ETM+, 7300 May 2010 acquisitions, processed on NASA Earth Exchange (NEX) Supercomputer MODIS Land Sinusoidal Projection 1.8km TOA true color browse, each browse pixel generated from 60 x 60 30m pixels MODIS Land Sinusoidal Projection

  17. More utility in combing Landsat 5 and Landsat 7 Number of Landsat acquisitions per land location in 36 months 2000 2010 Kovalskyy, V. and Roy, D.P., 2013, The global availability of Landsat 5 TM and Landsat 7 ETM+ land surface observations and implications for global 30m Landsat data product generation, Remote Sensing of Environment , 130, d 280–293. = 0 1 50 51 100 101 150 d 151 200 201 250 251 1040

  18. New WELD compositing (KFC algorithm) August 2008 Landsat 5 TM (12 acquisitions) ~30% cloudy California 5000 x 5000 30m pixels

  19. New WELD compositing (KFC algorithm) August 2008 Landsat 7 ETM+ (12 acquisitions) ~15% cloudy California 5000 x 5000 30m pixels

  20. New WELD compositing (KFC algorithm) August 2008 Landsat 5 & 7 (24 acquisitions) ~1% cloudy California 5000 x 5000 30m pixels

  21. KFC Landsat compositing algorithm informed by analysis of impact of atmosphere on WELD TOA reflectance Pixels sampled every 40 pixels across CONUS from 12 monthly WELD composites, ignoring cloud and saturated WELD pixels, ~ 53 million 30m pixels Band 1 (blue) Band 2 (green) Band 3 (red) surface reflectance TOA reflectance TOA reflectance TOA reflectance Band 4 (NIR) Band 5 (MIR) Band 7 (MIR) surface reflectance Roy, D.P., Qin, Y., Kovalskyy, V. , Vermote, E.F., Ju, J., Egorov, A., Hansen, M.C., Kommareddy, I., Yan, L., 2014 , Conterminous United States demonstration and characterization of MODIS-based Landsat ETM+ atmospheric correction, Remote Sensing of Environment, 140, 433-449. TOA reflectance TOA reflectance TOA reflectance

  22. Planned Global WELD Production on NEX monthly 30m products, fusion of contemporaneous Landsat 4,5,7 6 epochs of 36 months Process in reverse chronological order Number First products (36 months 2010 epoch) planned to be of available from USGS EROS late 2013 Landsat scenes in U.S. archive

  23. Global WELD Processing July 2010 Landsat 5 TM and Landsat 7 ETM+ scenes TOA reflectance MODIS sinusoidal projection

  24. Global WELD Processing July 2010 4840 Landsat 5 TM and 7534 Landsat 7 ETM+ scenes TOA Reflectance MODIS sinusoidal projection 29,652 x 14,826 1.35km browse pixels

  25. Global WELD Processing July 2010 4840 Landsat 5 TM and 7534 Landsat 7 ETM+ scenes Landsat Sensor 5 or 7 32% Landsat 5 68% Landsat 7 MODIS sinusoidal projection 29,652 x 14,826 1.35km browse pixels

  26. Global WELD Processing July 2010 4840 Landsat 5 TM and 7534 Landsat 7 ETM+ scenes Number of Sensors 1 or 2 52% one sensor 48% two sensors MODIS sinusoidal projection 29,652 x 14,826 1.35km browse pixels

  27. Global WELD Processing July 2010 4840 Landsat 5 TM and 7534 Landsat 7 ETM+ scenes Day of Year Mean = 197 (July 16 th ) MODIS sinusoidal projection 29,652 x 14,826 1.35km browse pixels

  28. Global WELD Processing July 2010 4840 Landsat 5 TM and 7534 Landsat 7 ETM+ scenes Number of Obs. Mean = 3.19 MODIS sinusoidal projection 29,652 x 14,826 1.35km browse pixels

  29. Global WELD Processing July 2010 4840 Landsat 5 TM and 7534 Landsat 7 ETM+ scenes NDVI Mean = 0.27 MODIS sinusoidal projection 29,652 x 14,826 1.35km browse pixels

  30. CONUS Forest (green) & Bare Ground (orange) locations defined by the 30m 5-year (2006 to 2010) WELD Land Cover Land Cover Change (LCLCC) product Hansen, M.C., Egorov, A., Potapov, P.V., Stehman, S.V., Tyukavina, A., Turubanova, S.A., Roy, D.P ., Goetz, S.J., Loveland, T.R., Ju, J., Kommareddy, A., Kovalskyy, V., Forsythe, C., Bents, T., 2014 , Monitoring conterminous United States (CONUS) land cover change with Web-Enabled Landsat Data (WELD), Remote sensing of Environment , 140, 466-484.

  31. Summary CONUS statistics (mean ± standard deviation) of top of atmosphere (filled circles) and MODIS based atmospherically corrected NDVI (open circles) Landsat 7 NDVI Forest mean monthly Extracted from 12 monthly NDVI surface > NDVI TOA (Dec. 2009 to Nov. 2010) WELD monthly by 0.10 products considering only non-cloudy non-saturated non-interpolated atm. characterization pixels. Soil mean monthly NDVI surface > NDVI TOA Forest: 2.4 to 4.6 million pixels per month by 0.005 NDVI Soil: 1 to 1.9 million pixels per month Roy, D.P., Qin, Y., Kovalskyy, V. , Vermote, E.F., Ju, J., Egorov, A., Hansen, M.C., Kommareddy, I., Yan, L., 2014 , Conterminous United States demonstration and characterization of MODIS-based Landsat ETM+ atmospheric correction, Remote Sensing of Environment, 140, 433-449. Month

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