-Geophysical and mapping data

                                                                                
                                       
  U.S. Geological Survey (USGS) data products, including cartographic data,     
geologic data, water data, and links to other USGS machines which hold          
data or metadata archives.                                                      
                                                                                
                                    
  U.S. Geological Survey's EROS Data Center (EDC).  Aerial photography,         
cartographic data, earth science data, hydrologic data, landuse/landcover       
data, radar data, satellite and satellite derivative data, topographic data.    
                                                                                
                            
  Earth Resources Observation Systems (EROS) Data Center Distributed Active     
Archive Center (EDC.DAAC).  Archives include land processes data, including     
satellite- and aircraft-acquired data:  1km AVHRR, Landsat Pathfinder data,     
Digital Chart of the World Derived Digital Elevation Model Data (topographical  
charts), SIR-C/X-SAR (Spaceborne Imaging Radar-C/X-band Synthetic Aperture      
Radar).                                                                         
                                                                                
                                                  
                                             
                                                  
  The National Geophysical Data Center (NGDC) of NOAA manages environmental     
data in the fields of solar-terrestrial physics, solid earth geophysics,        
marine geology and geophysics, paleoclimatology, and glaciology (snow and       
ice). In each of these fields it also operates a World Data Center (WDC A)      
discipline center.  Data and metadata are available.                            
                                                                                
                                          
  National Center for Atmospheric Research (NCAR)'s catalog of geophysical      
and vegetation datasets.  Several of these datasets are directly available      
via this page.                                                                  
                                                                                
                                           
                                      
  Shaded relief map of USA generated from 30 arc second DEM dataset.            
                                                                                
                                                   
  The Computer Oriented Geological Society (COGS) has various mapping-related   
information, datasets, and software.                                            
                                                                                
                                         
  Various USGS and other uncopyrighted data.  Includes USGS DEM and DLG         
files, land use information, and some software to read these files.             
                                                                                
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