data structure in GIS
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How do we represent these digitally in a GIS? by grouping into layers based on similar characteristics (e.g hydrography, elevation, water lines, sewer lines, grocery sales) and using either: vector data model (coverage in ARC/INFO, shapefile in ArcView) raster data model (GRID or Image in ARC/INFO & ArcView)
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GIS data can be separated into two categories: spatially referenced data which is represented by vector and raster forms (including imagery) and attribute tables which is represented in tabular format.
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