d.geodesic(1)

1d.geodesic(1)                 Grass User's Manual                d.geodesic(1)
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NAME

6       d.geodesic   -  Displays a geodesic line, tracing the shortest distance
7       between two geographic points along a great circle, in a longitude/lat‐
8       itude data set.
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KEYWORDS

11       display
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SYNOPSIS

14       d.geodesic
15       d.geodesic help
16       d.geodesic          [coor=lon1,lat1,lon2,lat2]          [lcolor=string]
17       [tcolor=string]   [--verbose]  [--quiet]
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19   Parameters:
20       coor=lon1,lat1,lon2,lat2
21           Starting and ending coordinates
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23       lcolor=string
24           Line color
25           Options:                   red,orange,yellow,green,blue,indigo,vio‐
26           let,white,black,gray,brown,magenta,aqua,grey,cyan,purple
27           Default: black
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29       tcolor=string
30           Text color or "none"
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DESCRIPTION

33       d.geodesic  displays  a geodesic line in the active frame on the user's
34       graphics monitor. This is also known  as  the  great  circle  line  and
35       traces  the  shortest distance between two user-specified points on the
36       curved surface of a longitude/latitude data  set.  The  two  coordinate
37       locations  named  must fall within the boundaries of the user's current
38       geographic region.
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OPTIONS

41       This program can be run either interactively or non-interactively.   If
42       the user types d.geodesic on the command line and runs it without other
43       program parameters, the mouse will be activated; the user is  asked  to
44       use  the  mouse to indicate the starting and ending points of each geo‐
45       desic line to be drawn. The default line color (black) and  text  color
46       (red) will be used.
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48       Alternately,  the  user can specify the starting and ending coordinates
49       of the geodesic, line color, and text color on the  command  line,  and
50       run the program non-interactively.
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52       Once the user indicates the starting and ending coordinates of the geo‐
53       desic, the line and its length (in miles) are displayed to  the  user's
54       graphics  monitor.  If  the text color is set to none, the great circle
55       distance is not displayed.
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NOTES

58       This program works only with GRASS locations using a longitude/latitude
59       coordinate system.
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AUTHOR

65       Michael Shapiro, U.S. Army Construction Engineering Research Laboratory
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67       Last changed: $Date: 2004-09-16 12:52:27 +0200 (Thu, 16 Sep 2004) $
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69       Full index
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71       © 2003-2008 GRASS Development Team
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75GRASS 6.3.0                                                      d.geodesic(1)