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Last Post 22 Oct 2008 10:14 AM by  anon
ENVI_CONVERT_FILE_COORDINATES
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anon



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22 Oct 2008 10:14 AM
    Hello! I'm working with ENVI/IDL. When I try to convert map coordinates to their corresponding x,y pixel coordinates, after doing the instruction: ENVI_CONVERT_FILE_COORDINATES, fid_tiff_B, gcp_x, gcp_y, gcp_mapX, gcp_mapY the variable gcp_x  takes negative values... It could be possible? How can this problem be solved? Cheers, Sara

    MariM



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    22 Oct 2008 10:20 AM
    What are the input map coordinates (i.e. values of xmap/ymap)?  File coordinates should not be negative.  For example, can you reproduce this with ENVI's sample dataset, bhtmref.img?  I did the following: ENVI> xmap=276165.00 ENVI> ymap=4903605.0 ENVI> envi_select, fid=fid ENVI> envi_convert_file_coordinates, fid, xf, yf, xmap, ymap ENVI> print, xf        46.000000 ENVI> print, yf        110.00000
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