1. Utilization of Ancillary Data Sets for SMAP AlgorithmDevelopment and Product Generation Peggy E. O’Neill, NASA GSFC Erika Podest, JPL Eni G. Njoku, JPL IGARSS’11, Vancouver, BC July 27, 2011 http://smap.jpl.nasa.gov National Aeronautics and Space Administration
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6. data from each primary source will be used now in pre-launch simulations
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10. best available source used for any given region
11. resulting global map a combination of different data sets
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13. better delineation between urban & rural areas
14. urban fraction > 0.5 shown
15. however, urban flag likely to be set much lower since TB cannot be corrected for presence of urban areas
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17. a 3 dB threshold is applied to HH to VV ratio to distinguish water from land
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19. Input Data Set: US SRTM SRTM GTOPO Alaska DEM Canada DEM Coverage: United States 56 °S to 60 °N Global Alaska Canada Source: NASA-JPL NASA-JPL USGS USGS GeoBase Resolution: 1 arc-second 3 arc-seconds 30 arc-seconds 2 arc-seconds 3x6 arc-seconds Horz. Datum: WGS84 WGS84 WGS84 NAD27 NAD83 Vertical Datum: EGM96 EGM96 EGM96 NAVD29 CVGD28 Projection: Geographic Geographic Geographic Geographic Geographic Acquisition Date: February 2000 February 2000 Late 1996 1925 - 1999 -- Topography / DEM JPL Global DEM -- compiled from different sources -- 1 arc-second resolution -- GMTED2010 will eventually replace GTOPO30 -- above will be useful in assessing any discontinuities between existing data sets -- elevation and slope variance (TBC) could be used to set topography flag
![BACKGROUND ,[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)