# GRASS Help System

category - In GRASS, data are categorized by their distinguishing characteristics (a.k.a., attributes or categories), such as depth to water table, soil moisture, etc. In a map layer, each unique attribute type is tagged with a unique integer value called a category value and a category label describing the category contents; each map can contain category values falling in the range +/- 2 to the 31. Attribute values may be assigned to points (a.k.a., sites), linear features, and area features.

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Automatically created on: Sat Jan 8 06:50:27 2005