NAME

       spottopgm - convert SPOT satellite images to a PGM image

SYNOPSIS

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

DESCRIPTION

       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.

OPTIONS

       In addition to the options common to all programs based on libnetpbm (most notably -quiet,
       see
        Common  Options  ⟨index.html#commonoptions⟩ ), spottopgm recognizes the following command
       line options:

       -1

       -2

       -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.

PARAMETERS

       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.

LIMITATIONS

       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 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 therefore wouldn't
       guarantee that this will work on any other images.

AUTHOR

       Warren Toomey wkt@csadfa.cs.adfa.oz.au

SEE ALSO

       pgm(1)

DOCUMENT SOURCE

       This manual page was generated by the Netpbm tool 'makeman' from HTML source.  The  master
       documentation is at

              http://netpbm.sourceforge.net/doc/spottopgm.html