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 ), 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

netpbm documentation                              22 July 2004                          Spottopgm User Manual(1)