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Mis-registration of 250 and 500 meter resolution bands to the 1000 meter resolution bands

Description

The 250 m bands (Bands 1 and 2) are aggregated to an equivalent radiance at 500 m resolution, and provided in the 500 m band product files. The 250 m and the 500 m bands are aggregated to an equivalent radiance at 1000 m, and provided in the 1000 m product files.

Impact to L1B Data Set

The ground mis-registration for the 250 m bands in the 500 m product is 250 m. The ground mis-registration of the 500 m bands in the 1000 m product is 500 m and the mis-registration of the 250 m bands in the 1000 m product is 750 m.

Estimated Impact to L2 Science Products

N/A

Cause of Effect

The aggregation process mistakenly assumed that all bands are registered with an identical starting point of the (triangular) ground contribution weighting function. The correct assumption is that the bands actually are registered at the peak of the ground contribution weighting function.

Mitigation Approach/ Added Testing to Characterize Effect

The aggregation algorithm was changed to reflect the actual band registration. A data correlation study confirmed that the highest correlation between bands was achieved when the bands are registered at the peak of the ground contribution weighting function.

Estimated Schedule to Complete

The aggregation algorithm was corrected in the Level 1B software, versions 2.5.5 and higher.

History of Characteristic

Epoch
Number
Time SpanVersion Number at
start of epoch
General CharacteristicsImprovementsDocumentation
1Feb. 24, 2000 - Jan. 26, 2001
2000055.1550 - 2001026.1200
2.3.2.0   
2Jan. 26, 2001 - present
2001026.1200 - present
2.5.5.0 Fixed.