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r.distance: Locates the closest points between objects in two raster maps.

r.distance - Locates the closest points between objects in two raster maps.


r.distance r.distance help r.distance [-loq] maps=map1,map2 [fs=string] [--verbose] [--quiet] Flags: -l Include category labels in the output -o Report zero distance if rasters are overlapping -q Run quietly --verbose Verbose module output --quiet Quiet module output Parameters: maps=map1,map2 Maps for computing inter-class distances fs=string Output field separator Default: :


r.distance locates the closest points between "objects" in two raster maps. An "object" is defined as all the grid cells that have the same category number, and closest means having the shortest "straight-line" distance. The cell centers are considered for the distance calculation (two adjacent grid cells have the distance between their cell centers). The output is an ascii list, one line per pair of objects, in the following form: cat1:cat2:distance:east1:north1:east2:north2 cat1 Category number from map1 cat2 Category number from map2 distance The distance in meters between "cat1" and "cat2" east1,north1 The coordinates of the grid cell "cat1" which is closest to "cat2" east2,north2 The coordinates of the grid cell "cat2" which is closest to "cat1" Flags -l The -l flag outputs the category labels of the matched raster objects at the beginning of the line, if they exist. -o The -o flag reports zero distance if the input rasters are overlapping.


The output format lends itself to filtering. For example, to "see" lines connecting each of the category pairs in two maps, filter the output using awk and then into d.graph: awk -F: '{print "move",$4,$5,"\ndraw",$6,$7}' | d.graph -m To create a vector map of all the "map1" coordinates, filter the output into awk and then into v.in.ascii: awk -F: '{print $4,$5}' | v.in.ascii format=point output=name fs=space


r.buffer, r.cost, r.drain, v.distance
Michael Shapiro, U.S. Army Construction Engineering Research Laboratory Last changed: $Date: 2008-05-13 21:22:32 +0200 (Tue, 13 May 2008) $ Full index (C) 2003-2010 GRASS Development Team R.DISTANCE(1)

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