Farsite is a fire growth simulation model that automatically computes wildfire growth and behavior for long time periods under heterogeneous conditions of terrain, fuels, and weather. It uses existing fire behavior models for surface and crown fires, post-frontal combustion, and fuel moisture. It is a deterministic model, meaning that you can relate simulation results directly to your inputs. Farsite produces outputs that are compatible with PC and Workstation graphics and GIS software for later analysis and display. It can simulate air and ground suppression actions, be used for fire gaming, asking multiple 'what-if' questions and comparing the results. It accepts both GRASS and ARC/INFO GIS raster data themes.