McIDAS Programmer's Manual
Version 2003

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Meteosat PDUS

Meteosat PDUS images are remapped and calibrated at the ground station before the stretched signal is disseminated. This simplifies the navigation and calibration data sections. All data is eight bits; each band is stored in a separate file.

 

For more information on Meteosat labels and headers, see the EUMETSAT document Meteosat High Resolution Image Dissemination.

Meteosat PDUS directory block

Word Value Description

14

1

each band is stored separately

19

0
128
512

for visible image band map
(eighth bit from right) for IR band map
(tenth bit from right) for WV band map

22

.xxxxx

MIEC absolute calibration band value (IR or WV) from the calibration section of the Meteosat header; stored as scaled integer xxxxx

23

xx.x

space count corresponding to the calibration value from the calibration section of the Meteosat header; stored as scaled integer xxx

24

1 or 2

physical sensor number from the Meteosat header

37

 

line offset of the southeast corner of the area in image coordinates; 16-bit value from the Meteosat header, right justified plus 1

38

 

element offset of the southeast corner of the area in image coordinates; 16-bit value from the Meteosat header, right justified plus 1

39

 

satellite center longitude of rectification; 16-bit value from the Meteosat header and right justified

44

0

 

49

24

length of the data block line prefix documentation, in bytes

50

0

length of the data block line prefix calibration, in bytes

51

0

length of the data block line prefix band list, in bytes

52

MSAT

image source type; 4 bytes ASCII

53

RAW

calibration type; 4 bytes ASCII

54

0
1

data was ingested as sent (full resolution)
data was sampled down (every other pixel); VIS is sent as resolution 1 in some images and resolution 2 in others

55

 

bitmap indicating types of data in the original image; bits are numbered right to left (least to most significant bit):
bit 0: 1 if VIS is included in transmission; 0 if not
bit 1: 1 if IR is included in transmission; 0 if not
bit 2: 1 if WV is included in transmission; 0 if not
all other bits = 0

Meteosat PDUS data block

The line prefix for the data block contains the information below. For the line data, each value is transmitted as eight bits and is stored west to east and north to south in the area, the opposite of how it is transmitted.

Region Description

validity code

this is present for the real-time data

documentation

24 bytes; this is a copy of the label that arrives with each subframe

calibration

0 bytes (not used)

band list

0 bytes (not used) since each band is stored in a separate area

Meteosat PDUS navigation block

A PDUS navigation block is divided into 256 words.

Word Value Description

1

MSAT

navigation type

2

 

Julian day of the navigation, yyddd

3

 

time of the navigation, hhmmss

4

0

reference position for the telescope

5

0

line number of the telescope reference position

6

1250

center scan line

7

 

center longitude of rectification (west positive), ddmmss

8 - 9

0

reserved

10

 

Julian day of the navigation, yyddd

11 - 256

0

reserved

Meteosat PDUS calibration block

No calibration block is needed for PDUS; the calibration information is stored in the directory block.

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