Raw PDUS data is supplied decommutated into one file for each channel. The data consists of a header followed by one unsigned byte for each pixel. Lines are padded with extra information after the image data which should be stripped before viewing. Missing lines are replaced with a repeat of the previous line to maintain complete files.
The header actually consists of 256 bytes of Dundee header plus 4864 bytes of modified heading sub-frame. The Dundee header contains a signature, the satellite name, image type, transmission format, time, number of lines, number of pixels per line, and line length.
For example, to display a BW transmission strip off the 5120 byte header and use the first 1250 bytes of each 1416-byte line, for 625 lines.
Note that you may have to rotate the image through 180 degrees.
Parameters for some common file formats are as follows:
| Satellite | Channel | File size | Header | Width | Height | Bytes per line |
|---|---|---|---|---|---|---|
| B | W | 890120 | 5120 | 1250 | 625 | 1416 |
| B | V | 3540120 | 5120 | 2500 | 1250 | 2828 |
| E,W,X | I,V,W | 1775120 | 5120 | 1250 | 1250 | 1416 |
A detailed format description is available in our document File Format of Data Delivered by Meteosat PDUS RCS
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