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]
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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   Options:    red,orange,yellow,green,blue,indigo,vio‐
25           let,white,black,gray,brown,magenta,aqua,grey,cyan,purple   Default:
26           black
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28       tcolor=string
29           Text color or "none"
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DESCRIPTION

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

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

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

64       Michael Shapiro, U.S. Army Construction Engineering Research Laboratory
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66       Last changed: $Date: 2004/09/16 10:52:27 $
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68       Full index
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72GRASS 6.2.2                                                      d.geodesic(1)