FRAGSTATS is a spatial pattern analysis program for categorical maps representing the landscape mosaic model of landscape structure. Note, FRAGSTATS is not suitable for continuous surface maps representing the landscape gradient model of landscape structure. The landscape subject to analysis is user-defined and can represent any spatial phenomenon. FRAGSTATS simply quantifies the spatial heterogeneity of the landscape as represented in the categorical map; it is incumbent upon the user to establish a sound basis for defining and scaling the landscape in terms of thematic content and resolution and spatial grain and extent. We strongly recommend that you read the FRAGSTATS Background section before using this program. Importantly, the output from FRAGSTATS is meaningful only if the landscape as defined is meaningful relative to the phenomenon under consideration.