Caliper Mapping and Transportation Glossary

DEFINITION

What is a layer?

A map layer is a GIS database containing groups of point, line, or area (polygon) features representing a particular class or type of real-world entities such as customers, streets, or postal codes. A layer contains both the visual representation of each feature and a link from the feature to its database attributes. Maps in a Geographic Information System are made by combining multiple layers.

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What is a map layer? GIS Map and its component layers

Combine a point layer of landmarks, a line layer of streets, and an area layer of ZIP Codes to create the GIS map shown on the right