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

NAME
       spottopgm - convert SPOT satellite images to a PGM image

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

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. 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.

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.

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	there‐
       fore wouldn't guarantee that this will work on any other images.

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

SEE ALSO
       pgm(1)

netpbm documentation		 22 July 2004	      Spottopgm User Manual(0)

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