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RB2LL

RB2LL

Name


      RB2LL

Purpose


      From range, bearing compute latitude, longitude .

Category


Calling Sequence


      rb2ll, lng0, lat0, dist, azi, lng1, lat1

Inputs


      lng0, lat0 = long, lat of starting point (deg). in
      dist = range to point of interest in RADIANS. in
      azi = azimuth to point of interest (degrees). in

Keyword Parameters


Keywords


        /DEGREES means distance is in degrees instead of radians.

Outputs


      lng1, lat1 = long, lat of point of interest (deg). out

Common Blocks


Notes


      Notes: A unit sphere is assumed, thus dist is in radians.
        Useful constants:
        Radius of Earth (mean) = 6371.23 km = 3958.899 miles.
        Distance to horizon from height H above surface:
          For small H: dist = sqrt(2*H/R) in Radians
          For large H: dist = acos(R/(R+H)) in Radians
        To plot horizon from lat0, lng0, H:
          rb2ll,lng0,lat0,dist,makex(0,360,1),plng,plat
          plots,plng-360.,plat,psym=3
        ll2rb is inverse.
        rb2lle is WGS84 ellipsoidal version.

Modification History


      R. Sterner, 13 Feb,1991
  Copyright (C) 2001, 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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