What is a Geographic Information System? Geographic Information System = GIS.

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Presentation transcript:

What is a Geographic Information System? Geographic Information System = GIS

What is a GIS?

Maps

What is a map? “A graphic depiction of all or part of a geographic realm in which the real- world features have been replaced by symbols in their correct spatial location at a reduced scale.” power line

From Map to GIS

Progression Map Web maps/ Web GIS GIS (local software)

Comparison Paper Map Web Map/ Web GIS GIS Software Display Data Display at multiple scales Query map features Display tabular or graphic data associated with map features Complex, on the fly queries

Map  Web Map  GIS A map is static, a GIS is dynamic A map has a single scale, a GIS is infinately scaleable A map shows spatial relationships, while a GIS shows both spatial relationships and tabular data