Version history for Fact Sheet 2008-3024 U.S. Geological Survey TerraLook: GIS-Ready Time-Series of Satellite Imagery for Monitoring Change Version 1.0: Posted On-line December 16, 2008 Version 1.1: Posted On-line September 16, 2009 The Tri-Decadal data were reprocessed and released as the Global Land Survey data with an additional 2005 data layer. Accordingly the term "Tri-decadal" was changed to "Global Land Survey" and the imagery time periods and language information for the TerraLook viewer were updated.