Where can you download DEMs?
Unfortunately, there is no one
source because DEMs come in many flavors and for many areas.
World | United States
| Canada | UK
| Moon | Mars
| Other
Geographic Resources
GNIS Query Form. The USGS has a handy query form to
help you find all things geographic (USA).
http://geonames.usgs.gov/pls/gnispublic
World
NGA GEOnet Names Server. A resource for searching non-US geographic
names.
http://geonames.nga.mil/gns/html/
GTOPO30 files (~10 Mb compressed) are available for the
world in 40 deg lon x 50 deg lat tiles that must be gunzipped
and untarred into a 57.6 Mb DEM.
Resolution: approximately 1 kilometer.
Source: http://earthexplorer.usgs.gov/
Alternate source: I have CDs of the compressed files
and WCS 5 project file. Contact me for costs.
Cost: none
Copyright Restrictions: none
ETOPO5 files that include continental and oceanic terrain.
Resolution: approximately 5(?) kilometers.
Source: http://www.ngdc.noaa.gov/mgg/global/global.html
Cost: none
Copyright Restrictions: none
Combined GTOPO30 and ETOPO5 files cleaned and integrated by David
Sandwell at Scripps. Subject to some copyright restrictions.
Resolution: approximately 3 kilometers.
Source: http://topex.ucsd.edu/marine_topo/mar_topo.html
Cost: none
Copyright Restrictions: see site
SRTM HGT files in 1º x 1º blocks
Information: http://www2.jpl.nasa.gov/srtm/cbanddataproducts.html
Cost: none
Copyright Restrictions: none
Landsat images aren't DEMs but are very useful
USGS Archive: http://glovis.usgs.gov or http://earthexplorer.usgs.gov
University of Maryland Global Land Cover Facility:
http://glcf.umd.edu/data/
Bathymetry
Global Multi-Resolution Topography (GMRT)
United States
Query Form. The USGS has a handy query form to
help you find all things geographic.
http://geonames.usgs.gov/pls/gnispublic
1:24 000 scale DEMs previously on the USGS site
have been moved to the GISDataDepot. The DEMs are now organized
by state and county. The new SDTS files cannot be imported into
WCS v5.52 and earlier versions; v5.53 and later versions can
import them. 10-m DEMs are also available for some areas. Equivalent
to 7.5-minute and 15-minute USGS topo maps. Best resolution.
Resolution: approximately 30 meters, some 10-m
data available
Source: http://www.gisdatadepot.com/dem/demdownload.html
Cost: none
Copyright Restrictions: none
USGS National Elevation Dataset
(NED) at 1:24,000 (1:63,360
Alaska) scale
http://viewer.nationalmap.gov/viewer/
Bathymetry
National Ocean Service's (NOS) Estuarine Bathymetry
Hawai'i: Coastal Geology Group
Canada
GeoBase. Lots of government agencies came together to
make quality GIS data available.
Resolution: 1:250K and 1:50K DEMs, coverage varies
Source: http://geobase.ca
Cost: no
Copyright Restrictions: see site
United Kingdom
Britian's Ordnance Survey
Maps
Source: http://www.ordnancesurvey.co.uk/
Cost: yes
Copyright Restrictions: see site
Copyright Restrictions: see site
Not of this World
Moon
Source: http://webgis.wr.usgs.gov/pigwad/down/moon_dl.htm
Cost: none
Copyright Restrictions: none
Mars
Source: http://mars.jpl.nasa.gov/mgs/sci/mola/mola-may99.html
Cost: none
Copyright Restrictions: none
Mars
a 'la MOLA tutorial for WCS
Mars a 'la MOLA tutorial for VNS
Other Data Resources
Landsat 7 Facts: http://geo.arc.nasa.gov/sge/landsat/l7.html
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