Virtual Geographic Information Systems
WILLIAM RIBARSKY, College of Computing, Georgia Institute of Technology
23.1 Introduction
Geospatial data are growing in diversity and size. Satellite imagery and elevation data at 30 M resolution are readily available for most of the Earth via Landsat and other sources. These sources also provide multispectral imagery at similar resolutions that distinguishes land use, vegetation cover, soil type, urban areas, and other elements. Higher-resolution aerial or satellite imagery for selected areas can be obtained. There are photographs at 1M resolution or better that cover most major cities, with insets at even higher resolution often available. There are also accurate digital maps. Tax assessment ...
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