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- ATPDEC README (Thierry Leconte 2003)
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- DESCRIPTION
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- Atpdec is an open source program that decodes images transmitted by POES
- NOAA weather satellite series.
- These satellites transmit continuously, among other things, medium
- resolution images of the earth on 137Mhz.
- These transmissions could be easily received with an inexpensive antenna
- and dedicated receiver.
- Output from such a receiver, is an audio signal that could be recorded
- into a soundfile with any soundcard.
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- Atpdec will convert these sounfiles into .png images.
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- For each soundfile up to 4 images could be generated :
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- 1. Raw image : contains the 2 transmitted channel images + telemetry
- and synchro pulses.
- 2. Calibrated channel A image
- 3. Calibrated channel B image
- 4. False color image
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- Input soundfiles must be mono signal sampled at 11025 Hz.
- Atpdec use libsnd to read soundfile, so any sound file format supported by libsnd
- could be read.(Only tested with .wav file).
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- COMPILATION
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- Atpdec is written in plain standart C and must be very portable.
- It was only tested on Linux Suse 8.2, but must work on any Unix platform.
- Just adapt the Makefile and type make (sorry no configure).
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- atpdec use libsnd, libpng and libm
- snd.h and png.h header must be present on your system.
- If they are not on standard path, edit the include path in the Makefile.
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- USAGE
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- atpdec [options] soundfile
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- -c file.png
- Use a given colormap for false color generation. Default : Internal colormap.
- -i [r|a|b|c]
- Toggle raw (r) , channel A (a) , channel B (b) or false color (c) output.
- Default : "abc"
- -d directory
- Optional images destination directory. Default : sounfile directory.
- -s Output 8bits grayscale images for chanel A|B and raw images. Default :16bits
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- Generated image are in png format, 16 or 8bits greyscale for raw and channel A|B images,
- 24bits RVB for false color.
- Image names are soundfilename-x.png, where x is :
- -r for raw images
- -satellite instrument number (1,2,3A,3B,4,5) for channel A|B images
- -c for false colors.
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- EXAMPLE
- atpdec -d test -i ac 09121333.wav
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- Will process the 09121333.wav file and generate channel A test/09121333-2.png and false color test/09121333-c.png image files.
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