Glossary of Planning and Geographic Information Systems (GIS) Terms

Glossary is usually defined as an alphabetical list of technical terms in some specialized field of knowledge. This knowledge base glossary provides a collection of knowledge base documents that define many technical terms. These terms are arranged alphabetically, but you can quickly jump to a specific term by selecting its first letter from the index of the knowledge base glossary below.

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Keyword

Term
Undershoot
An arc that does not extend far enough to intersect another arc. (See also Dangling ARC). See also:  Dangling Arc
Union
A topological overlay of two polygonal spatial data sets which preserves features that fall within the spatial extent of either input data set; that is, all features from both coverages are retained.
Universal Polygon
The first record in a polygon attribute table. It represents the area beyond the outer boundary of the coverage. It's the only polygon that never has a label point, and so has a User-ID value of 0. Its area equals the negative sum of all the polygons in the coverage. Also referred to as the external polygon.
Urban Design
The process of giving form, shape and character to the arrangement of buildings, to whole neighborhoods, or the city. Urban design blends architecture, landscaping and city planning concepts together to make an urban area accessible, attractive and functional.