Name

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      ELL_MERC

Purpose

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      Mercator projection on an ellipsoid, forward and inverse.

Category

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Calling Sequence

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      ell_merc, p1, p2

Inputs

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      p1,p2 = Values to be converted. in
        Either lng,lat or x,y.

Keyword Parameters

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Keywords

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        X=x,Y=y Convert given lng,lat to x,y and return.
        LNG=lng,LAT=lat Convert given x,y to lng,lat and return.
        SCALE=sc Map scale (def=1:1).
        CLNG=lng0 Central longitude (def=0).
        MAP_A=smj Returned value for the semimajor axis
          of the map. Includes scale.

Outputs

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Common Blocks

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Notes

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      Notes: Algorithms from John Snyder,
      Map Projections - A Working Manual.
      Use ellipsoid,set=name to set working ellipsoid.

Modification History

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      R. Sterner, 2002 Apr 08
      R. Sterner, 2002 May 01 --- Generalized the ellipsoid.
      R. Sterner, 2010 May 04 --- Converted arrays from () to [].
  Copyright (C) 2002, 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.