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

Detailed Format Description

A detailed format description is available in our document File Format of Data Delivered by Meteosat PDUS RCS

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