spottopgm(1) - phpMan

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. 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.

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 therefore wouldn't guaran-
tee that this will work on any other images.

AUTHOR
Warren Toomey wkt AT csadfa.au