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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 POES weather satellite images.
  6. It takes soundfiles recorded from a dedicated 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|t|d]
  18. Toggle raw (r) , channel A (a) , channel B (b) , false color (c) , temperatue (t) or pixel distrubution (d) output.
  19. Default : "ac"
  20. .TP
  21. .br
  22. .B \-d directory
  23. Optional images destination directory. Default : soundfile directory.
  24. .TP
  25. .br
  26. .B \-p
  27. Output 16bits grayscale image for channel A|B and raw images. Default : 8bits images.
  28. .TP
  29. .br
  30. .B \-s n
  31. Satellite ident : n=0 :NOOA-15 n=1 :NOAA-17 (used by Temperature compensation step).Default : NOAA17
  32. Generated image are in png format, 16 or 8bits greyscale for raw and channel A|B images,
  33. 24bits RVB for false color.
  34. Image names are soundfilename-x.png, where x is :
  35. -r for raw images
  36. -satellite instrument number (1,2,3A,3B,4,5) for channel A|B images
  37. -c for false colors.
  38. -d for pixel distribution stats.
  39. .SH DESCRIPTION
  40. Atpdec is a open source program that decode images transmitted by POES
  41. NOAA weather satellite serie.
  42. These satellites transmit continuously, among other things, medium resolution
  43. images of the earth on 137Mhz.
  44. These transmitions could be easely received with
  45. an inexpensive antenna and dedicated receiver.
  46. Output from such a receiver, is an audio signal that could be recorded
  47. into a soundfile with any soundcard.
  48. Atpdec will convert these sounfiles into .png images.
  49. For each soundfile up to 6 images could be generated :
  50. 1) Raw image : contains the 2 transmitted channel images + telemetry and synchro pulses.
  51. Raw image is not calibrated, so it could be too dark or too light depending of
  52. the recording level.
  53. 2) Calibrated channel A image
  54. 3) Calibrated channel B image
  55. 4) Temperature compensed I.R image
  56. 5) False color image
  57. 6) Pixel distribution statistique image (for cmap debugging only).
  58. Input soundfiles must be mono signal sampled at 11025 Hz.
  59. Atpdec use libsnd to read soundfile, so any sound file format supported by libsnd
  60. could be read.
  61. .SH EXAMPLE
  62. atpdec -d image -i ac *.wav
  63. .br
  64. Will process all .wav files in the current directory, generate only channel A and false color images and put them in the image directory.
  65. .SH AUTHOR
  66. Thierry Leconte (2003)