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NASA's Web-Enabled Landsat Data (WELD) provides annual 30-meter resolution satellite mosaics for the conterminous United States and Alaska. The dataset spans from 2002 to 2012, with each annual composite covering a 12-month period from December of the preceding year through November. It was produced through a collaboration between NASA, the USGS Earth Resources Observation and Science Center, and South Dakota State University.
This specific version (WELDUSYR.015) is decommissioned. Users are encouraged to migrate to the improved Global Web-Enabled Landsat Data (GWELD) Version 3, 3.1, or 3.2 datasets. Data is distributed in Hierarchical Data Format 4 (HDF4).