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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geographic realm in which the realworld features have been replaced by
symbols in their correct spatial location
at a reduced scale.”
power line
From Map to GIS
Map
Progression
GIS (local software)
Web maps/ Web GIS
Comparison
Paper
Map
Display Data
Display at multiple
scales
Query map features
Display tabular or
graphic data associated
with map features
Complex, on the fly
queries

Web Map/
Web GIS




GIS
Software





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
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