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v.net.salesman: Creates a cycle connecting given nodes (Traveling salesman problem). Note that TSP is NP-hard, heuristic algorithm is

v.net.salesman - Creates a cycle connecting given nodes (Traveling salesman problem). Note that TSP is NP-hard, heuristic algorithm is used by this module and created cycle may be sub optimal


vector, networking


v.net.salesman v.net.salesman help v.net.salesman [-g] input=name output=name [type=string[,string,...]] [alayer=integer] [nlayer=integer] [acolumn=string] ccats=range [--overwrite] [--verbose] [--quiet] Flags: -g Use geodesic calculation for longitude-latitude locations --overwrite Allow output files to overwrite existing files --verbose Verbose module output --quiet Quiet module output Parameters: input=name Name of input vector map output=name Name for output vector map type=string[,string,...] Arc type Options: line,boundary Default: line,boundary alayer=integer Layer number Arc layer Default: 1 nlayer=integer Layer number Node layer (used for cities) Default: 2 acolumn=string Arcs' cost column (for both directions) ccats=range Category values Categories of points ('cities') on nodes (layer is specified by nlayer)


v.net.salesman calculates the optimal route to visit nodes on a vector network.


Traveling salesman for 6 digitized nodes (Spearfish): g.copy vect=roads,myroads v.db.addcol myroads col="cost double precision" # define traveling costs as inverse of speed limit: v.db.update myroads col=cost val=1/50 v.db.update myroads col=cost val=1/75 where="label='interstate'" v.db.update myroads col=cost val=1/5 where="label='unimproved road'" v.db.update myroads col=cost val=1/25 where="label='light-duty road, improved surface'" v.db.select myroads # we have 6 locations to visit on our trip echo "1|601653.5|4922869.2|a 2|608284|4923776.6|b 3|601845|4914981.9|c 4|596270|4917456.3|d 5|593330.8|4924096.6|e 6|598005.5|4921439.2|f" | v.in.ascii cat=1 x=2 y=3 out=centers col="cat integer, \ east double precision, north double precision, label varchar(43)" # verify data preparation v.db.select centers v.category centers op=report # type count min max # point 6 1 6 # create lines map connecting points to network (on layer 2) v.net myroads points=centers out=myroads_net op=connect thresh=500 v.category myroads_net op=report # Layer / table: 1 / myroads_net # type count min max # line 837 1 5 # # Layer: 2 # type count min max # point 6 1 5 # The network is now prepared. Visualize it g.region vect=myroads_net d.mon x0 d.vect myroads_net d.vect -c centers icon=basic/triangle d.font verdana d.vect centers col=red disp=attr attrcol=label lsize=12 # due to the costs (?, TODO), the result looks like a Steiner tree: # v.net.salesman myroads_net acol=cost ccats=1-6 out=mysalesman # run without traveling costs v.net.salesman myroads_net ccats=1-6 out=mysalesman d.vect mysalesman col=green width=2 d.vect centers col=red disp=attr attrcol=label lsize=12
d.path, v.net, v.net.alloc, v.net.iso, v.net.path, v.net.steiner
Radim Blazek, ITC-Irst, Trento, Italy Documentation: Markus Neteler Last changed: $Date: 2009-05-18 23:02:34 +0200 (Mon, 18 May 2009) $ Full index (C) 2003-2010 GRASS Development Team V.NET.SALESMAN(1)

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