d.rhumbline(1grass) GRASS GIS User's Manual d.rhumbline(1grass)
NAME
d.rhumbline - Displays the rhumbline joining two longitude/latitude
coordinates.
KEYWORDS
display, distance, rhumbline
SYNOPSIS
d.rhumbline
d.rhumbline --help
d.rhumbline coordinates=lon1,lat1,lon2,lat2 [line_color=name]
[--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
DESCRIPTION
A rhumbline (loxodrome) is a line following a constant angle of the
compass (i.e., a line of constant direction). It crosses all meridians
at the same angle, i.e. a path of constant bearing. d.rhumbline dis-
plays the rhumbline joining any two user-specified points in the active
frame on the user’s graphics monitor. The named coordinate locations
must fall within the boundaries of the user’s current geographic re-
gion.
The user has to specify the starting and ending longitude/latitude co-
ordinates of the rhumbline and (optionally) the color in which the
rhumbline will be displayed; in this case, the program will run non-in-
teractively.
EXAMPLE
A geodesic line if shown over the political map of the world (demoloca-
tion dataset):
g.region vector=country_boundaries -p
d.mon wx0
d.vect country_boundaries type=area
d.rhumbline coordinates=55:58W,33:18S,26:43E,60:37N \
line_color=yellow
# show additionally 10 degree grid
d.grid 10
Rhumbline (loxodrome)
NOTES
This program works only in GRASS locations with longitude/latitude co-
ordinate system.
SEE ALSO
d.geodesic, d.grid, m.measure
AUTHOR
Michael Shapiro, U.S. Army Construction Engineering Research Laboratory
SOURCE CODE
Available at: d.rhumbline source code (history)
Accessed: unknown
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GRASS 7.8.7 d.rhumbline(1grass)
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