Geospatial Soil Sensing System (GEOS3): A powerful data mining procedure to retrieve soil spectral reflectance from satellite images

Overview of the Synthetic Soil Image (SYSI) generated from 27 years of Landsat 5 Thematic Mapper (TM) data. a) Soil surface variations from SYSI, in the RGB 543 composite. Black regions are missing values. b) View for the same extent in figure a by a single Landsat 5 TM image from 22 Feb 2005, in the RGB 321 composite. c) The 2,5D view of SYSI from figure a. d) Elevation gradient for the same extent in figure c (source: digital elevation model from the Shuttle Radar Thematic Mapper (SRTM)). The purple shades are related to soil types. Black regions are missing values for soil surface reflectance.478