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NAMEv.net.allpairs - Computes the shortest path between all pairs of nodes in the network.KEYWORDSvector, network, shortest pathSYNOPSISv.net.allpairsv.net.allpairs --help v.net.allpairs [-g] input=name output=name [arc_layer=string] [node_layer=string] [cats=range] [where=sql_query] [arc_column=name] [arc_backward_column=name] [node_column=string] [--overwrite] [--help] [--verbose] [--quiet] [--ui] Flags:
Parameters:
DESCRIPTIONv.net.allpairs computes the shortest path between each selected node and all other selected nodes. The output is a vector with the selected nodes and the shortest paths.NOTESAn attribute table is created and linked to layer arc_layer. The table contains four columns: cat, from_cat, to_cat, cost. Each cat entry denotes the category of the shortest path from the node with category from_cat to the node with category to_cat. If points are specified by cats, layer or where parameters then the table is filled only for the selected points.If arc_backward_column is not given then then the same costs are used for forward and backward arcs. EXAMPLEFind shortest path along roads from selected archsites (Spearfish sample dataset):# prepare network: connect archsites to roads with threshold 200 v.net input=roads@PERMANENT points=archsites@PERMANENT \ output=roads_net operation=connect thresh=200 # verify result v.category input=roads_net option=report # only lines should have a category in layer 1 # only points should have a category in layer 2 # shortest path between all points with categories 1 - 5 in layer 2 v.net.allpairs input=roads_net cats=1-5 out=roads_net_all v.db.select roads_net_allResult in matrix form: from\to 1 3 4 5 1 0 18820.386 17206.651 17373.274 3 18820.386 0 1739.079 9040.575 4 17206.651 1739.079 0 7426.84 5 17373.274 9040.575 7426.84 0 SEE ALSOv.net.path, v.net.distanceAUTHORSDaniel Bundala, Google Summer of Code 2009, StudentWolf Bergenheim, Mentor Markus Metz SOURCE CODEAvailable at: v.net.allpairs source code (history)Main index | Vector index | Topics index | Keywords index | Graphical index | Full index © 2003-2021 GRASS Development Team, GRASS GIS 7.8.6 Reference Manual
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