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NAME

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

KEYWORDS

       display, networking

SYNOPSIS

       d.path
       d.path help
       d.path  [-gb] map=name  [type=string[,string,...]]   [coor=x1,y1,x2,y2]   [alayer=integer]
       [nlayer=integer]    [afcol=string]     [abcol=string]     [ncol=string]     [color=string]
       [hcolor=string]   [bgcolor=string]   [--verbose]  [--quiet]

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

       -b
           Render bold lines

       --verbose
           Verbose module output

       --quiet
           Quiet module output

   Parameters:
       map=name
           Name of input vector map

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

       coor=x1,y1,x2,y2
           Starting and ending coordinates

       alayer=integer
           Layer number
           Arc layer
           Default: 1

       nlayer=integer
           Layer number
           Node layer
           Default: 2

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

       abcol=string
           Arc backward direction cost column

       ncol=string
           Node cost column

       color=string
           Original line color
           Default: black

       hcolor=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. The 'from' and 'to' points are
       entered  by  mouse  into  the map displayed in the GRASS monitor, or if the coor 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.

EXAMPLE

       Interactive shortest path routing on road network (Spearfish region):
       g.region vector=roads
       d.mon x0
       d.vect roads
       d.path roads
        Non-interactive shortest path routing on road network (Spearfish region):
       d.path -b roads coor=601653.5,4922869.2,593330.8,4924096.6

SEE ALSO

        v.net.path

AUTHOR

       Radim Blazek, ITC-Irst, Trento, Italy

       Last changed: $Date: 2009-04-23 10:10:45 +0200 (Thu, 23 Apr 2009) $

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