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ELL_GEOAZI_INT

ELL_GEOAZI_INT

Name


      ELL_GEOAZI_INT

Purpose


      Find intersection point of a geodesic and an azimuth line.

Category


Calling Sequence


      ell_geoazi_int, a, b, c, az, p

Inputs


      a, b = Points on geodesic. in
        Geodesic ab must cross circle (one intersection).
      c = Circle center. in
      az = Azimuth of circle radius. in

Keyword Parameters


Keywords


        /LOX Use loxodromic azimuth, else geodesic azimuth.
        ERROR=err Error flag: 0=ok.
        COUNT=cnt Binary search iteration count.

Outputs


      p = Intersection point. out
        Points are structures: {lon:lon, lat:lat}.

Common Blocks


Notes


      Notes: Points A and B are connected by a geodesic.
        Point is the intersection of this geodesic with an
        azimuth line from point C. The azimuth is assumed to
        be a geodesic azimuth unless the keyword /LOX is set,
        in which case it is a loxodromic azimuth.

Modification History


      R. Sterner, 2009 Jan 15
  Copyright (C) 2009, 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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