GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages
r.spreadpath(1) GRASS GIS User's Manual r.spreadpath(1)

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]

--overwrite

Allow output files to overwrite existing files
--help

Print usage summary
--verbose

Verbose module output
--quiet

Quiet module output
--ui

Force launching GUI dialog

x_input=name [required]

Name of raster map containing back-path easting information
y_input=name [required]

Name of raster map containing back-path northing information
coordinates=east,north[,east,north,...]

The map E and N grid coordinates of starting points
output=name [required]

Name for output raster map

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).

x_input=name

Name of input raster map layer containing backlink UTM easting coordinates.
y_input=name

Name of input raster map layer containing backlink UTM northing coordinates.
coordinates =x,y[,x,y,x,y, ...]

Each x,y coordinate pair gives the easting and northing (respectively) geographic coordinates of a target point from which to backwards trace the least cost path. As many points as desired can be entered by the user.
output=name

Name of raster map layer to contain output. Also can be used as the map layer of the input target points. If so used, the input target point map will be overwritten by the output.

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 (ref).

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)

Main index | Raster index | Topics index | Keywords index | Graphical index | Full index

© 2003-2021 GRASS Development Team, GRASS GIS 7.8.6 Reference Manual

GRASS 7.8.6

Search for    or go to Top of page |  Section 1 |  Main Index

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with ManDoc.