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CGCLIPTOMAP

CGCLIPTOMAP
  Allows an image or geoTiff file to be clipped or subset to a map projected boundary.

Categories


    Map Utilities
   

Returns


    The clipped or subsetted image is returned.
   

Params


    imageIn: in, required, type=varies
        Either a 2D or true-color image (in which, in both cases, a map coordinate object must be provided with the
        MAP keyword) or the name of the GeoTiff file from which an image and a map coordinate object
        can be obtained.
    boundary: in, required, type=fltarr
        A four-element array containing the map boundary to which the image should be clipped.
     

Keywords


    latlonbox: out, optional, type=fltarr
        A four-element array representing the boundary of the output image in
        the Google Map preferred form of [north, south, east, west] in decimal
        degrees.
    map: in, required, type=object
        A map coordinate object (cgMap) that maps or georeferences the input image.
    outboundary: out, optional, type=fltarr
        A four-element array containing the final map boundary of the clipped image.
        The boundary will be in XY coordinates (projected meters).
    outmap: out, optional, type=object
        An output map coordinate object (cgMap) that describes the output image.
    outposition: out, optional, type=intarr
        A four-element array containing the pixel locations of the output image
        in the input image pixel coordinate system: [x0,y0,x1,y1]. In other words,
        these are the values used to subset the input image.
       

Author


    FANNING SOFTWARE CONSULTING::
        David W. Fanning
        1645 Sheely Drive
        Fort Collins, CO 80526 USA
        Phone: 970-221-0438
        E-mail: david@idlcoyote.com
        Coyote's Guide to IDL Programming: http://www.idlcoyote.com

History


    Change History::
        Written, 16 August 2012. DWF.
        If the absolute value of the maximum of the boundary is LE 360, assume you need to convert
          from lat/lon space to projected meter space. 23 Aug 2012. DWF.
        Added MAPOUT and LATLONBOX keywords. 1 Nov 2012. DWF.
        Added OUTPOSITION keywords. 29 Nov 2012. DWF.
        I have reason to believe the way I was creating the location vectors and
          and image subset in this program was causing me to be 1 pixel off in
          creating the image subset. The algorithm has been tweaked to correct this. 12 Dec 2012. DWF.
        Duh! Changed the name of MapOut keyword to OutMap to make it work, but forgot to change
            the variable name. Output map coordinate object now returning properly. 20 May 2014. DWF.

Copyright


    Copyright (c) 2012, Fanning Software Consulting, Inc.



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