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. Unfor-
              tunately,  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

       spottopgm  could  extract  a three-color image (as a PPM), but I didn’t
       feel like making the program more complicated 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  there-
       fore wouldn’t guarantee that this will work on any other images.


       Warren Toomey



netpbm documentation             22 July 2004         Spottopgm User Manual(0)

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