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DEM2GeoEG is a program to convert USGS Digital Elevation Model
(DEM) data into a VRML .wrl file that uses the GeoVRML 1.0
GeoElevationGrid. The GeoElevationGrid is a version of the standard
ElevationGrid but it lets you georeference the data to geographic
coordinate systems such as UTM (Universal Transverse Mercator).
One benefit of this is that you can inline multiple GeoElevationGrids
into a single scene and they will be correctly located with respect to
each other.
This software is released as open source. It supports
7.5-minute USGS DEMs and offers a number of flexible
options for controlling the output GeoVRML file. Please
refer to the software's Home Page for more details. | 
