Center for Spatial Information Science and Systems (CSISS)
CSISS Geospatial Web Services index


This service is used to simulate the spread of wildfires.

Wildfire simulation modules in GRASS uses Rothermel's wildfire mathematical model, which is a surface fire model, belongs to semi-empirical models.(Xu, Jianping, 1994. Simulating the spread of wildfires using a geographic information system and remote sensing, Ph. D. Dissertation, Rutgers University, New Brunswick, New Jersey).

There are three GRASS programs r.ros, r.spread and r.spreadpath for simulating wildfire spread in GRASS. These modules are performing rate of spread calculation for each cell based on Rothermel equation for rate of spread (r.ros) and then performing 2D elliptical spread simulation. Time of spread, the rate of spread and the spread direction of the fire were obtained as the output and burned locations with elapsed times was estimated.


firespread - Simulates elliptically anisotropic spread and generates a raster map of the cumulative time of spread, given raster maps containing the rates of spread (ROS), the ROS directions and the spread origins.

Request Parameters:

URL of raster map containing fuel MODELs
Default format: GeoTIFF
URL of raster map containing dead fuel MOISTURE (%). At least one of the 1-h, 10-h, 100-h moisture layers is required
Default format: GeoTIFF
URL of raster map containing LIVE fuel MOISTURE (%)
Default format: GeoTIFF
URL of raster map containing midflame wind VELOCITYs (ft/min)
Default format: GeoTIFF
URL of raster map containing wind DIRECTIONs (degree)
Default format: GeoTIFF
URL of raster map raster map containing SLOPE (degree)
Default format: GeoTIFF
URL of raster map containing ASPECT (degree, anti-clockwise from E)
Default format: GeoTIFF
URL of raster map containing ELEVATION (m) (required w/ -s)
Default format: GeoTIFF

Response Parameters:

URL of output map showing 1) the base (perpendicular) rate of spread (ROS), 2) the cumulative spread time needed for a phenomenon to reach each cell from the starting sources (minutes), and 3) the least cost path backwards to cells from which the cumulative cost was determined.
Format of output map
Default: img/PNG

For further informations


See also GRASS commands


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