Data representation Geographic information system



gis data represents real objects (such roads, land use, elevation, trees, waterways, etc.) digital data determining mix. real objects can divided 2 abstractions: discrete objects (e.g., house) , continuous fields (such rainfall amount, or elevations). traditionally, there 2 broad methods used store data in gis both kinds of abstractions mapping references: raster images , vector. points, lines, , polygons stuff of mapped location attribute references. new hybrid method of storing data of identifying point clouds, combine three-dimensional points rgb information @ each point, returning 3d color image . gis thematic maps becoming more , more realistically visually descriptive of set out show or determine.


for list of popular gis file formats, such shapefiles, see gis file formats § popular gis file formats.







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