3DEM70 for Win95/98 and WinNT will produce three dimensional
terrain scenes, flyby animations, and VRML worlds from a wide
variety of freely available data sources including:

    USGS Digital Elevation Model (DEM) files
    USGS Spatial Data Transfer Standard (SDTS DEM) files
    USGS Global 30 Arc Second Elevation Data Set (GTOPO30 DEM)
    NASA Mars Digital Topographic Map (DTM) files
    Any elevation data file organized by rows and columns
    Internally generated Mandelbrot and Julia fractals

3DEM70 uses the SGI/Microsoft OpenGL libraries for high speed 3D
rendering. 3DEM will render 16 or 24 bit color three
dimensional projections, red-blue projections requiring red-blue
3D glasses for viewing, or color 3D projections requiring Liquid
Crystal (LCD) electronic shutter glasses for viewing.

3DEM70 scenes can be saved in the following formats.

    JPEG (*.jpg)
    Windows bitmap (*.bmp)
    Height field for POV ray tracing (*.tga)
    Flyby animation (*.mpg)
    LCD flyby animation (*.fly)
    VRML world (*.wrl)
    Binary elevation matrix (*.dat)
    ASCII elevation matrix (*.txt)

3DEM70 allows low resolution real-time flyby of DEM landscapes
using OpenGL. Keyboard controls are used to climb, dive, and
turn in space above the DEM surface. The path through space is
recorded in memory during flight, allowing subsequent creation
of a full resolution mpeg animation along the flight path.

To install 3DEM70 just copy 3dem.exe, 3dem.hlp, and 3dem.cnt to 
a convenient directory on your hard drive.  You can run 
3dem.exe directly from this location or create a shortcut to 
3dem.exe for your desktop.

3DEM70 is freeware and is freely distributable. Contact the
author, Richard Horne, at rshorne@mnsinc.com.