How are the B&W and colour scenes merged for level 1A given that, even though simultaneously acquired, they are not registered?
The B&W and colour scenes are acquired with a slight difference in viewing angle, with the B&W sensor pointed a little to the front and the colour sensor pointed a little towards the rear; the difference between the two is about 1.058 degrees which corresponds to about 15 km on the ground. This difference leads to local geometric offsets as well as a slight time difference (There is a delay of 2.25 seconds between the acquisition of a landscape line by the B&W sensor and the acquisition of the same line by the colour sensor). The merger process fixes the geometric deviations between the two level 1A scenes in the following way: • First the colour scene is geometrically adjusted to fit the B&W scene, using only the instruments’ data, the satellite attitude data and the ephemeris data. This stage restores the colour image to fit the focal plane of the B&W image. • Secondly the 2 previously adjusted scenes undergo thorough correlation processing. This calculation is done to correct parall
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