r.spreadpath(1grass) | GRASS GIS User's Manual | r.spreadpath(1grass) |
r.spreadpath - Recursively traces the least cost path backwards to cells from which the cumulative cost was determined.
raster, fire, cumulative costs
r.spreadpath
r.spreadpath --help
r.spreadpath x_input=name y_input=name
[coordinates=east,north[,east,north,...]]
output=name [--overwrite] [--help]
[--verbose] [--quiet] [--ui]
r.spreadpath is part of the wildfire simulation toolset. Preparational steps for the fire simulation are the calculation of the rate of spread (ROS) with r.ros, and the creating of spread map with r.spread. Eventually, the fire path(s) based on starting point(s) are calculated with r.spreadpath.
r.spreadpath recursively traces the least cost path backwards to the origin, given backlink information input map layers and target locations from where paths are to be traced. The backlink information map layers record each cell’s backlink UTM northing (the y_input) and easting (the x_input) coordinates from which the cell’s cumulative cost was determined.
The backlink inputs can be generated from another GRASS raster program r.spread. One of the major applications of r.spreadpath along with r.spread is to accurately find the least cost corridors and/or paths on a raster setting. More information on r.spread and r.spreadpath can be found in Xu (1994).
r.spread, r.ros Sample data download: firedemo.sh (run this script within the "Fire simulation data set" location).
Jianping Xu and Richard G. Lathrop, Jr., Center for Remote Sensing and Spatial Analysis, Rutgers University.
Available at: r.spreadpath source code (history)
Accessed: Sunday Jan 22 07:36:30 2023
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