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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 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 guaran-
       tee that this will work on any other images.

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


netpbm documentation			   22 July 2004 		 Spottopgm User Manual(0)
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