1d.path(1)                   GRASS GIS User's Manual                  d.path(1)
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NAME

6       d.path  - Finds shortest path for selected starting and ending node.
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KEYWORDS

9       display, network, shortest path
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SYNOPSIS

12       d.path
13       d.path --help
14       d.path    [-gb]   map=name    [arc_type=string[,string,...]]    coordi‐
15       nates=x1,y1,x2,y2  [arc_layer=string]   [node_layer=string]   [arc_col‐
16       umn=string]      [arc_backward_column=string]      [node_column=string]
17       [color=string]   [highlight_color=string]   [bgcolor=string]   [--help]
18       [--verbose]  [--quiet]  [--ui]
19
20   Flags:
21       -g
22           Use geodesic calculation for longitude-latitude locations
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24       -b
25           Render bold lines
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27       --help
28           Print usage summary
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30       --verbose
31           Verbose module output
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33       --quiet
34           Quiet module output
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36       --ui
37           Force launching GUI dialog
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39   Parameters:
40       map=name [required]
41           Name of vector map
42           Or data source for direct OGR access
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44       arc_type=string[,string,...]
45           Arc type
46           Options: line, boundary
47           Default: line,boundary
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49       coordinates=x1,y1,x2,y2 [required]
50           Starting and ending coordinates
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52       arc_layer=string
53           Arc layer
54           Vector  features can have category values in different layers. This
55           number determines which layer to use. When  used  with  direct  OGR
56           access this is the layer name.
57           Default: 1
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59       node_layer=string
60           Node layer
61           Vector  features can have category values in different layers. This
62           number determines which layer to use. When  used  with  direct  OGR
63           access this is the layer name.
64           Default: 2
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66       arc_column=string
67           Arc forward/both direction(s) cost column (number)
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69       arc_backward_column=string
70           Arc backward direction cost column (number)
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72       node_column=string
73           Node cost column
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75       color=string
76           Original line color
77           Default: black
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79       highlight_color=string
80           Highlight color
81           Default: red
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83       bgcolor=string
84           Background color
85           Default: white
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DESCRIPTION

88       d.path  enables  shortest  path vector networking.  Costs may be either
89       line lengths, or attributes saved in a database table.   Supported  are
90       cost  assignments  for  both arcs and nodes, and also different in both
91       directions of a vector line. For areas cost will  be  calculated  along
92       boundary lines.
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NOTE

95       The  user  needs  to  display  a  vector map before using d.path. If no
96       graphics monitor is open, a file map.png is generated  in  the  current
97       directory.
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99       The  ’from’ and ’to’ points are entered by mouse into the map displayed
100       in the GRASS monitor, or if the coordinates option is used they can  be
101       specified  non-interactively.   The  actions bound to the mouse buttons
102       are described in the terminal window when running the command.
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104       To calculate shortest path non-interactively and save the path to a new
105       vector map, use the v.net.path module.
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EXAMPLES

108       Interactive  shortest path routing on road network (North Carolina sam‐
109       ple dataset):
110       g.region vector=roadsmajor -p
111       d.vect roadsmajor
112       d.path roadsmajor coordinates=668646.15,224447.16,668348.83,235894.02
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114       Non-interactive shortest path routing on road network  (North  Carolina
115       sample dataset):
116       d.path -b roadsmajor coordinates=668646.15,224447.16,668348.83,235894.02
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SEE ALSO

119        v.net.path
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AUTHOR

122       Radim Blazek, ITC-Irst, Trento, Italy
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SOURCE CODE

125       Available at: d.path source code (history)
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127       Main  index | Display index | Topics index | Keywords index | Graphical
128       index | Full index
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130       © 2003-2020 GRASS Development Team, GRASS GIS 7.8.5 Reference Manual
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134GRASS 7.8.5                                                          d.path(1)