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- ATPDEC README (Thierry Leconte 2003)
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- DESCRIPTION
-
- 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.
-
- Atpdec will convert these sounfiles into .png images.
-
- For each soundfile up to 6 images could be generated :
-
- 1. Raw image : contains the 2 transmitted channel images + telemetry
- and synchro pulses.
- 2. Calibrated channel A image
- 3. Calibrated channel B image
- 4. Temperature compensed I.R image
- 5. False color image
- 6. pixel distribution statistique (usefull for false color parameter debugging).
-
- Input soundfiles must be mono signal sampled at 11025 Hz.
- Atpdec use libsndfile to read soundfile, so any sound file format supported by libsndfile
- could be read.(Only tested with .wav file).
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- COMPILATION
-
- 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 libsndfile, 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] soundfiles ...
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- OPTIONS
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- -i [r|a|b|c|t|d]
- Toggle raw (r) , channel A (a) , channel B (b) , false color (c) ,
- temperature (t) or pixel distrubution (d) output.
- Default : "ac"
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- -d directory
- Optional images destination directory.
- Default : soundfile directory.
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- -s n
- Satellite ident : n=0 :NOOA-15 n=1 :NOAA-17
- Used for Temperature compensation.
- Default : NOAA17
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- -c conf_file
- Use configuration file for false color generation.
- Default : Internal parameters.
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- -p 8|16
- Output 16bits grayscale image for channel A|B and raw images.
- Default : 8bits images.
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- OUTPUT
-
- Generated image are in png format, 16 or 8bits greyscale for raw and channel A|B images,
- 24bits RVB for false color.
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- 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.
- -d for pixel distribution stats.
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- EXAMPLE
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- atpdec -d image -i ac *.wav
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- Will process all .wav files in the current directory, generate only channel A and false color images and put them in the image directory.
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