Inputs

Preparing Inputs and Importing Maps into GRASS

LSCorridors need two raster maps as input files: a resistance surface map and a map of patches that will be connected (source-target map, or simply ST map). These maps may be prepared outside GRASS (using other GIS softwares, for example).

The former may be a result of a reclassification of a land use map using expert knowledge, a species distribution model output, or the result of the analysis of movement or gene flow for an organism, for instance.

In the latter map, patches must be identified with a number without repetition. Although not necessary, another file that could be useful (and that may be imported into LSCorridors) is a list with the patches identification numbers (ID) that one wants to connect. The three demonstration files that we will use in this tutorial are in the demonstration database folder.