NAME
d.path - Find shortest path for selected starting and ending node
SYNOPSIS
d.path
d.path help
d.path [-g] map=string [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=string
- Name of input vector
- 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
GRASS 5.7 tutorial pages
AUTHOR
Radim Blazek, ITC-Irst, Trento, Italy
Last changed: $Date: 2004/12/03 16:33:52 $
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