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1994-03-01
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spottopgm(1L) AMIGA spottopgm(1L)
NAME
spottopgm - convert SPOT satellite images to Portable
Greymap format
SYNTAX
spottopgm [-1|2|3] [Firstcol Firstline Lastcol Lastline]
inputfile
OPTIONS
-1|2|3 Extract the given colour from the SPOT image. The
colours are infra-red, visible light and ultra-
violet, although I don't know which corresponds to
which number. If the image is in colour, this will
be announced on standard error. The default colour
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.
DESCRIPTION
Spottopgm converts the named inputfile into Portable Greymap
format, defaulting to the first color and the whole SPOT
image unless specified by the options.
INSTALLATION
You must edit the source program and either define
BIG_ENDIAN or LITTLE_ENDIAN, and fix the typedefs for
uint32_t, uint16_t and uint8_t appropriately.
BUGS
Currently 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 (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 infra-red, visible and ultra-
violet.
I've only had 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
Page 1 (printed 3/1/94)
spottopgm(1L) AMIGA spottopgm(1L)
SEE ALSO
The rest of the Pbmplus suite.
Page 2 (printed 3/1/94)