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ELL_SEG_PT_CLOSEST

ELL_SEG_PT_CLOSEST

Name


      ELL_SEG_PT_CLOSEST

Purpose


      Find point on segment closest to a given point.

Category


Calling Sequence


      ell_seg_pt_closest, p1, p2, p3, p4

Inputs


      p1, p2 = Segment start and end point. in
      p3 = Given point off the segment. in

Keyword Parameters


Keywords


        FLAG=flag 0: closest pt is between segment endpoints.
                  1: Closest pt is outside segment on p1 side.
                  2: Closest pt is outside segment on p2 side.
        COUNT=cnt Iteration counts.

Outputs


      p4 = Returned point on segment closest to p3. out
        Each point is a structure: {log:lon, lat:lat}.

Common Blocks


Notes


      Notes: Uses ellipsoidal distances and returns result to
        within 1 mm.

Modification History


      R. Sterner, 2007 Aug 29
  Copyright (C) 2007, Johns Hopkins University/Applied Physics Laboratory
  This software may be used, copied, or redistributed as long as it is not
  sold and this copyright notice is reproduced on each copy made. This
  routine is provided as is without any express or implied warranties
  whatsoever. Other limitations apply as described in the file disclaimer.txt.



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