d.path(1)

NAME
d.path - Find shortest path for selected starting and ending node

KEYWORDS
display, networking

SYNOPSIS
d.path
d.path help
d.path [-g] map=name [type=string[,string,...]] [alayer=integer] [nlayer=integer] [afcol=string] [abcol=string] [ncol=string] [color=string] [hcolor=string] [bgcolor=string]

  Flags:

-g  Use geodesic calculation for longitude-latitude locations

  Parameters:

map=name
    Name of input vector map

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

alayer=integer
    Arc layer Default: 1

nlayer=integer
    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 - based on DGLib (Directed Graph Library) vector network library (see screenshot). 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. The actions bound to the mouse buttons are described in the terminal window when running the command.

To calculate shortest path non-interactively, the module v.net.path must be used.

SEE ALSO
v.net.path, DGLib

AUTHOR
Radim Blazek, ITC-Irst, Trento, Italy

Last changed: $Date: 2005/04/05 07:56:15 $

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