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d.geodesic(1)		    GRASS GIS User's Manual		 d.geodesic(1)

NAME
       d.geodesic   -  Displays	a geodesic line, tracing the shortest distance
       between two geographic points along a great circle, in a	longitude/lat-
       itude 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,lat2A	[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

DESCRIPTION
       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 lo-
       cations named must fall within the boundaries of	the user's current ge-
       ographic	region.

OPTIONS
       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 graphi-
       cal output. If the text color is	set to none, the great circle distance
       is not displayed.

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
       # 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

       Geodesic	line (great circle line)

NOTES
       This program works only in GRASS	locations with longitude/latitude  co-
       ordinate	system.

SEE ALSO
	d.rhumbline, d.grid, m.measure

AUTHOR
       Michael Shapiro,	U.S. Army Construction Engineering Research Laboratory

SOURCE CODE
       Available at: d.geodesic	source code (history)

       Main  index | Display index | Topics index | Keywords index | Graphical
       index | Full index

       A(C) 2003-2020 GRASS Development	Team, GRASS GIS	7.8.3 Reference	Manual

GRASS 7.8.3							 d.geodesic(1)

NAME | KEYWORDS | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLE | NOTES | SEE ALSO | AUTHOR | SOURCE CODE

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