Thematic Map Layers

A thematic map layer is a map showing the spatial distribution of a particular geographic feature or phenomenon that can be categorized and symbolized by using three basic symbol types: point symbols (such as symbols in Public Places layer), line symbols (such as symbols in Sewer Mains layer) and area symbols (such as symbols in Zoning District layer).

The thematic layers display spatial variations of one theme or attribute, such as Pop-Growth 91-96 layer containing population growth intensity by local areas between 1991-1996 census or Street Operations District Foreman's Areas layer containing four different district types. If you turn on the thematic layer from the legend all the information in that layer will be displayed, you don't have the option of choosing the information of one value or range or a specific type.

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