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Spottopgm User Manual(0)                              Spottopgm User Manual(0)

       spottopgm - convert SPOT satellite images to a PGM image

       spottopgm [-1|-2|-3] [Firstcol Firstline Lastcol Lastline] inputfile



       -3     Extract  the  given color from the SPOT image.  The colors are infrared, visible light, and ultraviolet,
              although I don't know which corresponds to which number.  If the image is in color, spottopgm  announces
              this on Standard Error.  The default color is 1.

       Firstcol Firstline Lastcol Lastline
              Extract  the  specified rectangle from the SPOT image.  Most SPOT images are 3000 lines long and 3000 or
              more columns wide. Unfortunately, the SPOT format only gives the width and not the length.  The width is
              printed on standard error.  The default rectangle is the width of the input image by 3000 lines.

       This program is part of Netpbm(1).

       spottopgm  converts  the  named inputfile to PGM format, defaulting to the first color and the whole SPOT image
       unless you specify otherwise with the options.

       spottopgm doesn't determine the length of the input file; this would involve two passes over  the  input  file.
       It defaults to 3000 lines instead.

       spottopgm  could extract a three-color image (as a PPM), but I didn't feel like making the program more compli-
       cated than it is now.  Besides, there is no one-to-one correspondence between red, green,  blue  and  infrared,
       visible and ultraviolet.

       I've  had  only  a  limited number of SPOT images to play with, and therefore wouldn't guarantee that this will
       work on any other images.

       Warren Toomey


netpbm documentation             22 July 2004         Spottopgm User Manual(0)