DEM and DLG Viewers
The DEM and DLG viewers are two free downloadable software tools provided by the USGS for viewing digital data. These two software programs were written by the USGS Mid-Continent Mapping Center (MCMC). The DEM viewer can be downloaded from this page, but MCMC no longer provides support for this viewer. These two software tools run on Windows platform.
The dem3d viewer is a tool to view and move the DEM files (.dem format) through a 3-dimensional perspective.
Click on the following links to download the desired version of dem3d viewer.
Dem3d (Win NT or 2000)
Dem3d (Win 95)
To view some screen captures from the dem3d viewer, please visit: 
http://craterlake.wr.usgs.gov/dem3d.html.
The dlgv32 viewer is a data viewer program designed to preview cartographic
data sets such as DLG, DRG, DEM, and DOQ. The dlgv32 viewer allows you
to merge and layer the data files. Please visit
dlgv32
Pro for additional information and latest release.
Click on the following links to download the desired version of the dlgv32 viewer.
For more information and to view some screen captures from the dlgv32
viewer, please visit:
http://craterlake.wr.usgs.gov/dlgv32.html.
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