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
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
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 firstname.lastname@example.org
netpbm documentation 22 July 2004 Spottopgm User Manual(0)
Man(1) output converted with