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

6       d.rhumbline   -  Displays  the  rhumbline  joining  two  user-specified
7       points, in the active frame on the user's graphics monitor.
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KEYWORDS

10       display
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SYNOPSIS

13       d.rhumbline
14       d.rhumbline help
15       d.rhumbline  [coor=lon1,lat1,lon2,lat2]   [lcolor=string]   [--verbose]
16       [--quiet]
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18   Parameters:
19       coor=lon1,lat1,lon2,lat2
20           Starting and ending coordinates
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22       lcolor=string
23           Line color
24           Options:                   red,orange,yellow,green,blue,indigo,vio‐
25           let,white,black,gray,brown,magenta,aqua,grey,cyan,purple
26           Default: black
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DESCRIPTION

29       A rhumbline (loxodrome) is a line following a  constant  angle  of  the
30       compass  (i.e., a line of constant direction). It crosses all meridians
31       at the same angle, i.e. a path of constant bearing.
32        d.rhumbline displays the  rhumbline  joining  any  two  user-specified
33       points  in  the active frame on the user's graphics monitor.  The named
34       coordinate locations must fall within the boundaries of the user's cur‐
35       rent geographic region.
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37       The  user  can  run  this  program either interactively or non-interac‐
38       tively.  If the user simply types d.rhumbline on the command  line  and
39       runs  it  without  specifying parameter values, the mouse will be acti‐
40       vated and the user will be asked to use the mouse to indicate  the  two
41       endpoints of the rhumbline.  The rhumbline is then drawn in the default
42       color (black).
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44       Alternately, the user  can  specify  the  starting  and  ending  longi‐
45       tude/latitude  coordinates  of the rhumbline and (optionally) the color
46       in which the rhumbline will be displayed; in  this  case,  the  program
47       will run non-interactively.
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NOTES

50       This program works only with longitude-latitude locations.
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SEE ALSO

53       d.geodesic
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AUTHOR

56       Michael Shapiro, U.S. Army Construction Engineering Research Laboratory
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58       Last changed: $Date: 2005-10-18 09:45:17 +0200 (Tue, 18 Oct 2005) $
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60       Full index
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62       © 2003-2008 GRASS Development Team
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66GRASS 6.3.0                                                     d.rhumbline(1)