Sources Of Free GIS Data
Free National GIS Data:
Below you will find sources of free national GIS data layers ie. shapefiles, e00, DEM, etc.
National Historical Geographic Information System
State Cultural Data:
(State level websites will usually have county level data, including imagery and natural resource data.)
Imagery:
Video Tutorials on how to get free High Resolution imagery and free Historical Imagery
Earth Resource Observation and Science (EROS) Center
Earth Explorer (Landsat, AVHRR and aerial photos)
Global Land Cover Facility (ASTER, Landsat, MODIS, AVHRR)
Global Visualization Viewer (Free ASTER, MODIS and Landsat Imagery)
Landsat.org (Large collection of Landsat imagery, not all free)
Global Mapping Solutions (Everything from aerial photography to digital street maps)
GASearch Oil & Gas Price Information.
