Digital Elevation Map (DEM) data

There are several sites which carry DEM data free for download. Some of these sources are:

The Silver Surfer , DEM and satellite data and pointers
ftp://resdgs1.er.usgs.gov , A USGS ftp site
ftp://dis2qvarsa.er.usgs.gov , A USGS ftp site
ftp://edcftp.cr.usgs.gov , A USGS ftp site
ftp://info.er.usgs.gov , A USGS ftp site
ftp://spectrum.xerox.com/pub/map/dem/
http://edcwww.cr.usgs.gov/ , An entry point into the USGS web
http://edcwww.cr.usgs.gov/glis/hyper/guide/1_dgr_demfig/index1m.html - 1 degree DEMs
http://info.er.usgs.gov/ , An entry point into the USGS web

The USGS also sells DEM data for most of the US.

There are a number of programs to convert DEM files to eg. gif, or POV TGA format.

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