It takes ~0.56 seconds for the
instrument to scan the width of the
swath. During this time, the nadir point
of the satellite moves ~3.75 km (the
satellite moves at ~6.7 km s-1)
• At the start of the scan, the satellite is
at A, looking at the point A’ at the edge
of the swath (perpendicular to the
satellite motion). By the time the
mirror rotates to view B’, the satellite
has moved to B. The line connecting A’
to B’ is not perpendicular to the
satellite motion.
• Thus, without the bow-tie effect, each
SDR granule is more of a parallelogram
than a rectangle