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- .TH ATPDEC 1 "Atpdec ATP satellite image decoder"
- .SH NAME
- atpdec
- .SH OVERVIEW
- atpdec is a decoder for NOAA POES weather satellite images.
- It takes soundfiles recorded from a dedicated receiver and convert them into .png images.
- .SH SYNOPSIS
- .B atpdec
- .I "[options]" soundfiles ...
- .SH OPTIONS
- .TP
- .br
- .B \-c file.png
- Use a private colormap for false color generation. Default : Internal colormap.
- .TP
- .br
- .B \-i [r|a|b|c|t|d]
- Toggle raw (r) , channel A (a) , channel B (b) , false color (c) , temperatue (t) or pixel distrubution (d) output.
- Default : "ac"
- .TP
- .br
- .B \-d directory
- Optional images destination directory. Default : soundfile directory.
- .TP
- .br
- .B \-p
- Output 16bits grayscale image for channel A|B and raw images. Default : 8bits images.
- .TP
- .br
- .B \-s n
- Satellite ident : n=0 :NOOA-15 n=1 :NOAA-17 (used by Temperature compensation step).Default : NOAA17
-
- Generated image are in png format, 16 or 8bits greyscale for raw and channel A|B images,
- 24bits RVB for false color.
- 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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-
- .SH DESCRIPTION
- Atpdec is a open source program that decode images transmitted by POES
- NOAA weather satellite serie.
- These satellites transmit continuously, among other things, medium resolution
- images of the earth on 137Mhz.
- These transmitions could be easely 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.
- Raw image is not calibrated, so it could be too dark or too light depending of
- the recording level.
-
- 2) Calibrated channel A image
-
- 3) Calibrated channel B image
-
- 4) Temperature compensed I.R image
-
- 5) False color image
-
- 6) Pixel distribution statistique image (for cmap debugging only).
-
- Input soundfiles must be mono signal sampled at 11025 Hz.
- Atpdec use libsnd to read soundfile, so any sound file format supported by libsnd
- could be read.
-
-
- .SH EXAMPLE
- atpdec -d image -i ac *.wav
-
- .br
- Will process all .wav files in the current directory, generate only channel A and false color images and put them in the image directory.
- .SH AUTHOR
- Thierry Leconte (2003)
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