The NASA funded global Web Enabled Landsat Data (GWELD) project seeks to provide global coverage Landsat ARD, specifically monthly and annual Landsat 30 m information for any terrestrial non-Antarctic location for six 3-year epochs spaced every 5 years from 1985 to 2010. The GWELD are generated from every available Landsat 4 and 5 Thematic Mapper (TM) and 7 Enhanced Thematic Mapper plus (ETM+) image held in the U.S. Landsat archive. The reflective wavelength bands are corrected to nadir BRDF-adjusted surface reflectance. Given the considerable global Landsat data volume (~125,000 Landsat images/year) the GWELD products are generated on the NASA Earth Exchange (NEX) high performance super computer with an output volume of 24TB/year.