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A rhumbline (loxodrome) is a line following a constant angle of the
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compass (i.e., a line of constant direction). It crosses all meridians
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at the same angle, i.e. a path of constant bearing.
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points on the compass (points are roughly 11 degrees 15
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minutes apart). --> <EM>d.rhumbline</EM> displays the
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rhumbline joining any two user-specified points in the
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active frame on the user's graphics monitor. The named
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coordinate locations must fall within the boundaries of the
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user's current geographic region.
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The user can run this program either interactively or
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non-interactively. If the user simply types
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<B>d.rhumbline</B> on the command line and runs it without specifying
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parameter values, the mouse will be activated and the user
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will be asked to use the mouse to indicate the two
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endpoints of the rhumbline. The rhumbline is then drawn in
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the default color (black). <!-- The program also outputs the
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coordinate locations of the two endpoints on the user's
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terminal and the number associated with the mouse button
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depressed by the user in a format useful for input to other
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Alternately, the user can specify the starting and ending
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longitude/latitude coordinates of the rhumbline and
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(optionally) the color in which the rhumbline will be
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displayed; in this case, the program will run
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This program works only with longitude-latitude locations.
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<EM><A HREF="d.geodesic.html">d.geodesic</A></EM>
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U.S. Army Construction Engineering
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<p><i>Last changed: $Date: 2005-10-18 09:45:17 +0200 (Tue, 18 Oct 2005) $</i>