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  1. .TH ATPDEC 1 "Atpdec ATP satellite image decoder"
  2. .SH NAME
  3. atpdec
  4. .SH OVERVIEW
  5. atpdec is a decoder for NOAA weather satellite images (ATP).
  6. It takes soundfiles recorded from an ATP receiver and convert them into .png images.
  7. .SH SYNOPSIS
  8. .B atpdec
  9. .I "[options]" soundfiles ...
  10. .SH OPTIONS
  11. .TP
  12. .br
  13. .B \-c file.png
  14. Use a private colormap for false color generation. Default : Internal colormap.
  15. .TP
  16. .br
  17. .B \-i [r|a|b|c]
  18. Toggle raw (r) , channel A (a) , channel B (b) or false color (c) output.
  19. Default : "abc"
  20. .TP
  21. .br
  22. .B \-d directory
  23. Optional images destination directory. Default : soundfile directory.
  24. .TP
  25. .br
  26. .B \-s
  27. Output 8bits grayscale image for channel A|B and raw images. Default : 16bits images.
  28. Generated image are in png format, 16 or 8bits greyscale for raw and channel A|B images,
  29. 24bits RVB for false color.
  30. Image names are soundfilename-x.png, where x is :
  31. -r for raw images
  32. -satellite instrument number (1,2,3A,3B,4,5) for channel A|B images
  33. -c for false colors.
  34. .SH DESCRIPTION
  35. Atpdec is a open source program that decode images transmitted by POES
  36. NOAA weather satellite serie.
  37. These satellites transmit continuously, among other things, medium resolution
  38. images of the earth on 137Mhz.
  39. These transmitions could be easely received with
  40. an inexpensive antenna and dedicated receiver.
  41. Output from such a receiver, is an audio signal that could be recorded
  42. into a soundfile with any soundcard.
  43. Atpdec will convert these sounfiles into .png images.
  44. For each soundfile up to 4 images could be generated :
  45. 1) Raw image : contains the 2 transmitted channel images + telemetry and synchro pulses.
  46. Raw image is not calibrated, so it could be too dark or too light depending of
  47. the recording level.
  48. 2) Calibrated channel A image
  49. 3) Calibrated channel B image
  50. 4) False color image
  51. Input soundfiles must be mono signal sampled at 11025 Hz.
  52. Atpdec use libsnd to read soundfile, so any sound file format supported by libsnd
  53. could be read.
  54. .SH EXAMPLE
  55. atpdec -d image -i ac *.wav
  56. .br
  57. Will process all .wav files in the current directory, generate only channel A and false color images and put them in the image directory.
  58. .SH AUTHOR
  59. Thierry Leconte (2003)