1d.rhumbline(1)              GRASS GIS User's Manual             d.rhumbline(1)
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NAME

6       d.rhumbline   -  Displays  the rhumbline joining two longitude/latitude
7       coordinates.
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KEYWORDS

10       display, distance, rhumbline
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SYNOPSIS

13       d.rhumbline
14       d.rhumbline --help
15       d.rhumbline     coordinates=lon1,lat1,lon2,lat2       [line_color=name]
16       [--help]  [--verbose]  [--quiet]  [--ui]
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18   Flags:
19       --help
20           Print usage summary
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22       --verbose
23           Verbose module output
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25       --quiet
26           Quiet module output
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28       --ui
29           Force launching GUI dialog
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31   Parameters:
32       coordinates=lon1,lat1,lon2,lat2 [required]
33           Starting and ending coordinates
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35       line_color=name
36           Line color
37           Either a standard color name or R:G:B triplet
38           Default: black
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DESCRIPTION

41       A  rhumbline  (loxodrome)  is  a line following a constant angle of the
42       compass (i.e., a line of constant direction). It crosses all  meridians
43       at  the  same angle, i.e. a path of constant bearing.  d.rhumbline dis‐
44       plays the rhumbline joining any two user-specified points in the active
45       frame  on  the user’s graphics monitor.  The named coordinate locations
46       must fall within the boundaries of the user’s  current  geographic  re‐
47       gion.
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49       The  user has to specify the starting and ending longitude/latitude co‐
50       ordinates of the rhumbline and (optionally)  the  color  in  which  the
51       rhumbline will be displayed; in this case, the program will run non-in‐
52       teractively.
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EXAMPLE

55       A geodesic line if shown over the political map of the world (demoloca‐
56       tion dataset):
57       g.region vector=country_boundaries -p
58       d.mon wx0
59       d.vect country_boundaries type=area
60       d.rhumbline coordinates=55:58W,33:18S,26:43E,60:37N \
61         line_color=yellow
62       # show additionally 10 degree grid
63       d.grid 10
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65       Rhumbline (loxodrome)
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NOTES

68       This  program works only in GRASS locations with longitude/latitude co‐
69       ordinate system.
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SEE ALSO

72        d.geodesic, d.grid, m.measure
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AUTHOR

75       Michael Shapiro, U.S. Army Construction Engineering Research Laboratory
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SOURCE CODE

78       Available at: d.rhumbline source code (history)
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80       Accessed: Saturday Jan 21 21:14:13 2023
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82       Main index | Display index | Topics index | Keywords index |  Graphical
83       index | Full index
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85       © 2003-2023 GRASS Development Team, GRASS GIS 8.2.1 Reference Manual
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89GRASS 8.2.1                                                     d.rhumbline(1)
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