NAME
d.geodesic - Displays a geodesic line, tracing the shortest distance between two geographic points along a great circle, in a longitude/latitude data set.
KEYWORDS
display,
distance,
great circle,
shortest path
SYNOPSIS
d.geodesic
d.geodesic --help
d.geodesic coordinates=lon1,lat1,lon2,lat2 [line_color=name] [text_color=name] [units=string] [--help] [--verbose] [--quiet] [--ui]
Flags:
- --help
- Print usage summary
- --verbose
- Verbose module output
- --quiet
- Quiet module output
- --ui
- Force launching GUI dialog
Parameters:
- coordinates=lon1,lat1,lon2,lat2 [required]
- Starting and ending coordinates
- line_color=name
- Line color
- Either a standard color name or R:G:B triplet
- Default: black
- text_color=name
- Text color
- Either a standard color name or R:G:B triplet
- units=string
- Units
- Units
- Options: meters, kilometers, feet, miles
- Default: meters
d.geodesic displays a geodesic line in the active frame on the user's
graphics monitor. This is also known as the great circle line and traces the
shortest distance between two user-specified points on the curved surface of
a longitude/latitude data set. The two coordinate locations named must fall
within the boundaries of the user's current geographic region.
By default black line color and red text color will be used.
By indicating the starting and ending coordinates
of the geodesic, the line and its length (by default in meters) are displayed to
the graphical output. If the text color is set to none,
the great circle distance is not displayed.
A geodesic line if shown over the political map of the world
(demolocation dataset):
g.region vector=country_boundaries -p
d.mon wx0
d.vect country_boundaries type=area
# show additionally a 20 degree grid
d.grid 20
d.geodesic coordinates=55:58W,33:18S,26:43E,60:37N \
line_color=yellow text_color=red units=kilometers
![](d_geodesic.png)
Geodesic line (great circle line)
This program works only with longitude/latitude
coordinate system.
d.rhumbline,
d.grid,
m.measure
Michael Shapiro, U.S. Army Construction Engineering Research Laboratory
SOURCE CODE
Available at:
d.geodesic source code
(history)
Latest change: Wednesday Apr 17 11:38:48 2024 in commit: af7aa6982f1bc0f006e95221291b5ca125abd1e6
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GRASS Development Team,
GRASS GIS 8.4.1dev Reference Manual