xenial (1) d.path.1grass.gz

NAME

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

KEYWORDS

       display, network, shortest path

SYNOPSIS

       d.path
       d.path --help
       d.path   [-gb]   map=name   [arc_type=string[,string,...]]   coordinates=x1,y1,x2,y2   [arc_layer=string]
       [node_layer=string]      [arc_column=string]      [arc_backward_column=string]       [node_column=string]
       [color=string]   [highlight_color=string]   [bgcolor=string]   [--help]  [--verbose]  [--quiet]  [--ui]

   Flags:
       -g
           Use geodesic calculation for longitude-latitude locations

       -b
           Render bold lines

       --help
           Print usage summary

       --verbose
           Verbose module output

       --quiet
           Quiet module output

       --ui
           Force launching GUI dialog

   Parameters:
       map=name [required]
           Name of vector map
           Or data source for direct OGR access

       arc_type=string[,string,...]
           Arc type
           Options: line, boundary
           Default: line,boundary

       coordinates=x1,y1,x2,y2 [required]
           Starting and ending coordinates

       arc_layer=string
           Arc layer
           Vector  features  can have category values in different layers. This number determines which layer to
           use. When used with direct OGR access this is the layer name.
           Default: 1

       node_layer=string
           Node layer
           Vector features can have category values in different layers. This number determines which  layer  to
           use. When used with direct OGR access this is the layer name.
           Default: 2

       arc_column=string
           Arc forward/both direction(s) cost column (number)

       arc_backward_column=string
           Arc backward direction cost column (number)

       node_column=string
           Node cost column

       color=string
           Original line color
           Default: black

       highlight_color=string
           Highlight color
           Default: red

       bgcolor=string
           Background color
           Default: white

DESCRIPTION

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

NOTE

       The  user  needs  to  display  a  vector  map before using d.path. If no graphics monitor is open, a file
       map.png is generated in the current directory.

       The ’from’ and ’to’ points are entered by mouse into the map displayed in the GRASS monitor,  or  if  the
       coordinates  option  is  used  they  can  be specified non-interactively.  The actions bound to the mouse
       buttons are described in the terminal window when running the command.

       To calculate shortest path non-interactively and save the path to a new vector map,  use  the  v.net.path
       module.

EXAMPLES

       Interactive shortest path routing on road network (North Carolina sample dataset):
       g.region vector=roadsmajor -p
       d.vect roadsmajor
       d.path roadsmajor coordinates=668646.15,224447.16,668348.83,235894.02

       Non-interactive shortest path routing on road network (North Carolina sample dataset):
       d.path -b roadsmajor coordinates=668646.15,224447.16,668348.83,235894.02

SEE ALSO

        v.net.path

AUTHOR

       Radim Blazek, ITC-Irst, Trento, Italy

       Last changed: $Date: 2014-12-19 22:55:37 +0100 (Fri, 19 Dec 2014) $

       Main index | Display index | Topics index | Keywords index | Full index

       © 2003-2016 GRASS Development Team, GRASS GIS 7.0.3 Reference Manual