Digital Raster Graphics are created and maintained by the United States Geological Survey (USGS). The maps have been scanned into digital format and contain topographical and survey information. Find resources here to understanding and working with DRGs. The first site to visit is the DRG homepage which contains information about DRGs and how to obtain them.
Image credit: NASA/GSFC/METI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team NASA’s Advanced Spaceborne Thermal Emission and Reflection Radiometer (Aster) recently captured images of the Hayman fire burning … Read more
Centers of Population from 1790 – 2000 based on calculations by the US Census.
Jason-1 is a satellite to be jointly operated by NASA and CNES (Centre National d’Etudes Spatiales), the French space agency. Scheduled for launch no earlier than September 15th of this year, Jason-1 will work in tandem with TOPEX/Poseidon, a U.S.-French satellite in operation since 1992. TOPEX/Poseidon marked its ninth anniversary in orbit on August 10th, 2001.
Number of Fortune 1000 companies categorized by state for the year 2000. The list of total count of Fortune 1000 companies by state is ranked … Read more