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Transcript
Lecture 3
How does GIS work
How does GIS work?Maps are stored in computers
Databases and Tables
Geometry
Attributes
How does GIS work?Categories of reality are divided into layers
Countries, States, Cities
Parcels of land ownership
Roads, Rivers, Lakes, Buildings
ZIP codes
How does GIS work?Layers are made up of points, lines, or polygons
GIS links attribute and spatial data Each layer has a database table Each map feature has one record in the table The table has attributes about the features
One to one: layer and table One to one: map feature and record
Is your data spatial? >80 percent of all data has location “What’s your ZIP code”