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r.distance
Langue: en
Version: 369607 (fedora - 01/12/10)
Section: 1 (Commandes utilisateur)
NAME
r.distance - Locates the closest points between objects in two raster maps.KEYWORDS
rasterSYNOPSIS
r.distancer.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: :
DESCRIPTION
Locates the closest points between "objects" in two raster maps. An dqobject" 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
cat1:cat2:distance:east1:north1:east2:north2
Explanation:
- 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"
NOTES
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.map graph:r.distance maps=map1,map2 | rs
awk -F: '{print "move",$4,$5,"rsndraw",$6,$7}' | d.graph -m
To create a site list of all the "map1" coordinates, filter the output into awk and then into s.in.ascii:
r.distance maps=map1,map2 | rs
awk -F: '{print $4,$5}' | s.in.ascii sites=name
SEE ALSO
r.buffer, r.cost, r.drain, v.distanceAUTHOR
Michael Shapiro, U.S. Army Construction Engineering Research LaboratoryLast changed: $Date: 2006-10-04 16:32:47 +0200 (Wed, 04 Oct 2006) $
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