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  1. ATPDEC README (Thierry Leconte 2003)
  2. DESCRIPTION
  3. Atpdec is an open source program that decodes images transmitted by POES
  4. NOAA weather satellite series.
  5. These satellites transmit continuously, among other things, medium
  6. resolution images of the earth on 137Mhz.
  7. These transmissions could be easily received with an inexpensive antenna
  8. and dedicated receiver.
  9. Output from such a receiver, is an audio signal that could be recorded
  10. into a soundfile with any soundcard.
  11. Atpdec will convert these sounfiles into .png images.
  12. For each soundfile up to 4 images could be generated :
  13. 1. Raw image : contains the 2 transmitted channel images + telemetry
  14. and synchro pulses.
  15. 2. Calibrated channel A image
  16. 3. Calibrated channel B image
  17. 4. False color image
  18. Input soundfiles must be mono signal sampled at 11025 Hz.
  19. Atpdec use libsnd to read soundfile, so any sound file format supported by libsnd
  20. could be read.(Only tested with .wav file).
  21. COMPILATION
  22. Atpdec is written in plain standart C and must be very portable.
  23. It was only tested on Linux Suse 8.2, but must work on any Unix platform.
  24. Just adapt the Makefile and type make (sorry no configure).
  25. atpdec use libsnd, libpng and libm
  26. snd.h and png.h header must be present on your system.
  27. If they are not on standard path, edit the include path in the Makefile.
  28. USAGE
  29. atpdec [options] soundfile
  30. -c file.png
  31. Use a given colormap for false color generation. Default : Internal colormap.
  32. -i [r|a|b|c]
  33. Toggle raw (r) , channel A (a) , channel B (b) or false color (c) output.
  34. Default : "abc"
  35. -d directory
  36. Optional images destination directory. Default : sounfile directory.
  37. -s Output 8bits grayscale images for chanel A|B and raw images. Default :16bits
  38. Generated image are in png format, 16 or 8bits greyscale for raw and channel A|B images,
  39. 24bits RVB for false color.
  40. Image names are soundfilename-x.png, where x is :
  41. -r for raw images
  42. -satellite instrument number (1,2,3A,3B,4,5) for channel A|B images
  43. -c for false colors.
  44. EXAMPLE
  45. atpdec -d test -i ac 09121333.wav
  46. Will process the 09121333.wav file and generate channel A test/09121333-2.png and false color test/09121333-c.png image files.