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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. 

  29. Generated image are in png format, 16 or 8bits greyscale for raw and channel A|B images,

  30. 24bits RVB for false color.

  31. Image names are soundfilename-x.png, where x is :

  32.         -r for raw images

  33.         -satellite instrument number (1,2,3A,3B,4,5) for channel A|B images

  34.         -c for false colors.

  35. 

  36. 

  37. .SH DESCRIPTION

  38. Atpdec is a open source program that decode images transmitted by POES

  39. NOAA weather satellite serie.

  40. These satellites transmit continuously, among other things, medium resolution

  41. images of the earth on 137Mhz.

  42. These transmitions could be easely received with

  43. an inexpensive antenna and dedicated receiver.

  44. Output from such a receiver, is an audio signal that could be recorded

  45. into a soundfile with any soundcard.

  46. 

  47. Atpdec will convert these sounfiles into .png images.

  48. 

  49. For each soundfile up to 4 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. 

  54. 2) Calibrated channel A image

  55. 

  56. 3) Calibrated channel B image

  57. 

  58. 4) False color image

  59. 

  60. Input soundfiles must be mono signal sampled at 11025 Hz.

  61. Atpdec use libsnd to read soundfile, so any sound file format supported by libsnd

  62. could be read.

  63. 

  64. 

  65. .SH EXAMPLE

  66. atpdec -d image -i ac *.wav

  67. 

  68. .br

  69. Will process all .wav files in the current directory, generate only channel A and false color images and put them in the image directory.

  70. .SH AUTHOR

  71. Thierry Leconte (2003)