d.path.1grass man page

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) $

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GRASS 7.0.4 Grass User's Manual