A large percentage of the data is static.
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With the exception of satellite images which are obtained periodically, census data and DEM data are essentially fixed.
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For visually appealing terrain rendering, it is imperative that data having high spatial content be obtained.
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Public Domain data lacks the spatial resolution that the project demands.
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Commercial data, when used, has been found to meet these requirements. In the case of satellite imagery, commercial data is the only reasonable alternative.
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