• The constant angular resolution of the
detectors results in an increasing pixel
“footprint” size projected onto the Earth as the
scan is further from nadir (see schematics on
right)
• This means that the actual area of each scan
has the shape of a bow-tie (see figure below)
– Consecutive scans overlap away from nadir
• The “bow-tie effect” is reduced during
processing from RDR to SDR through a
combination of aggregation and deletion of
overlapping pixels
– The red pixels below are deleted from each scan in
the data arrays (given “pixel-trim” fill value)
– DNB files do not have “pixel-trim” fill due to unique
processing that keeps pixel resolution nearly
constant across the swath