d.path(1) - Linux man page

Name

d.path - Find 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,...]: Type
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 - 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, 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

# Spearfish d.vect roads d.path -b roads coor="601653.5,4922869.2","593330.8,4924096.6"

Author

Radim Blazek, ITC-Irst, Trento, Italy

Last changed: $Date: 2007-05-03 12:31:16 +0200 (Thu, 03 May 2007) $

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