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   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
           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"

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   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 | \
   awk -F: '{print "move",$4,$5,"\ndraw",$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 | \
   awk -F: '{print $4,$5}' | s.in.ascii sites=name

СÐ. ТÐÐÐÐ

   [1]r.buffer, [2]r.cost, [3]r.drain, [4]v.distance

ÐÐТÐÐ

   Michael Shapiro, U.S. Army Construction Engineering Research Laboratory

   Last changed: $Date: 2006-10-04 09:32:47 -0500 (СÑ, 04 Ð¾ÐºÑ 2006) $

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References

   1. file://localhost/root/tmp/2/fin/r.buffer.html
   2. file://localhost/root/tmp/2/fin/r.cost.html
   3. file://localhost/root/tmp/2/fin/r.drain.html
   4. file://localhost/root/tmp/2/fin/v.distance.html