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Provides geographical interface to spatially referenced information (place names, population, etc) and terrain models for overlaying electromagnetic and weather simulations
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User can interactively navigate over the terrain, and point and click (or search) to find information (in the form of a web page) for a particular region
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Terrain model utilizes digital terrain data
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Elevation data at 100 meter resolution
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Satellite images at 30 meter resolution
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Could use other data such as Synthetic Aperture Radar
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2D terrain viewer uses only satellite images, has been implemented in Java
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3D terrain viewer uses satellite images draped over an elevation grid, has been implemented in VRML
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Spatially referenced information from a multimedia database is overlaid onto the 2D or 3D image
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