>  Docs Center  >  Libraries  >  JHU/APL/S1R  >  CONCOORD

CONCOORD

CONCOORD

Name


      CONCOORD

Purpose


      Convert between two linear coordinate systems.

Category


Calling Sequence


      concoord, x1, y1, x2, y2

Inputs


      x1,y1 = input coordinates. in

Keyword Parameters


Keywords


        /ROUND means round output to nearest integers.
          Intended for pixel coordinates.
        /TO_1 the input point(s), x1,y1, are in system 2 and are
          to be converted to system 1. /TO_1 is the default.
        /TO_2 the input point(s), x1,y1, are in system 1 and are
          to be converted to system 2.
        /INIT means initialize coordinate transformations.
          In this case x1,y1 are the known reference point
          coordinates in system 1, and x2,y2 are the known
          reference point coordinates in system 2.
          At least 3 non-colinear reference points are needed
          to define the coordinate transformations, more are
          ok. So for /INIT all 4 parameters are inputs and
          arrays of at least 3 elements.
        NAME1=nm1, NAME2=nm2 Optional coordinate system names,
          def=system 1 and system 2. Only on /INIT.
          Use /SYSTEMS to display system names at a later time.
          Very useful to make the correct calls clear.

Outputs


      x2,y2 = output coordinates. out

Common Blocks


      concoord_com

Notes


      Notes: Example for pixel coordinates and lat/long:
        concoord,ix,iy,lng,lat,/init,name1='Pixels',name2='Long/lat'
          ix,iy are arrays of ref pt pixel coord, lng,lat are
          arrays of ref pt long, lat.
        concoord,lng,lat,ix,iy,/to_1,/round
          From long,lat find pixel coordinates.

Modification History


      R. Sterner, 1996 Oct 2
      R. Sterner, 2010 May 03 --- Converted arrays from () to [].
  Copyright (C) 1996, 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.



© 2019 Harris Geospatial Solutions, Inc. |  Legal
My Account    |    Store    |    Contact Us