d.pathgrass - Online in the Cloud

PROGRAM:

NAME

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

Use d.pathgrass online using onworks.net services