A New Paradigm-The GIS "Layer Cake"

- Hydrology

-Soils

- Roads

-Elevation

-Land use / land cover

(from satellite imagery or air photos)

-The landscape (in all its complexity)

Decomposition

and

georeferencing

define a GIS

A GIS consists of a layer cake of computerized maps.

Each data layer is georeferenced to a common map projection and datum

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