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MAPLATLONG

MAPLATLONG

Name


      MAPLATLONG

Purpose


      Find complete lat/long range covered by map.

Category


Calling Sequence


      maplatlong

Inputs


Keyword Parameters


Keywords


        RANGE=[long_min, long_max, lat_min, lat_max].
        /QUIET means do not display range.
        /NOEXPAND do not expand range using floor and ceil.
        STEP=step Step size in pixels for lat/long search (def=3).
          May need 1 for highly distorted maps like /ortho.
        SPACE=spc Returned structure giving points off the map.
          Structure elements are:
            in = 1-d indices of points off map for image in window.
            ix, iy = starting pixel of map window.
            nx, ny = size of map window in pixels.
          To use, after maplatlong,space=space do (example):
            z = tvrd(space.ix, space.iy, space.nx, space.ny)
            z(space.in) = 255
            tv,z,space.ix, space.iy
          Forces step=1.
        ERROR=err Error flag: 0=no valid map points found.

Outputs


Common Blocks


Notes


      Notes: An array of device coordinates covering the map
        window is converted to lat/long. By default the
        range found is expanded using floor and ceil, useful
        when the map includes a pole or the -180/+180 long.

Modification History


      R. Sterner, 2001 Feb 01
      R. Sterner, 2001 Dec 27 --- Handled NaN. Also check more points.
      R. Sterner, 2002 Jan 09 --- Tried to handle the -180/+180 break.
      R. Sterner, 2002 Jan 22 --- Added SPACE keyword.
      R. Sterner, 2005 Feb 21 --- Relaxed last plot restriction.
      R. Sterner, 2008 Jun 24 --- Kept space nx, ny in range.
      R. Sterner, 2010 May 23 --- Converted arrays from () to [].
  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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