d.path(1grass) GRASS GIS User's Manual d.path(1grass)
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,...]] coordi-
nates=x1,y1,x2,y2 [arc_layer=string] [node_layer=string] [arc_col-
umn=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 ac-
cess 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 ac-
cess 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 sam-
ple 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
SOURCE CODE
Available at: d.path source code (history)
Accessed: unknown
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GRASS 7.8.7 d.path(1grass)
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