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In addition to a SAR, each ERS satellite also carries a Wind
Scatterometer as part of its Active Microwave Instrument (AMI).
The primary objective of wind scatterometers is to measure radar
backscattering from ocean surface waves, from which wind
velocity and direction can be estimated. However,
scatterometers also collect data over land as well. Like the
ERS SAR instruments, the ERS Wind Scatterometers operate at
C-band (5.3 GHz) and VV polarization (vertically sent and
received radar pulses). However, they operate over a much
greater range of incident angle (18-57? as opposed to 23? for
ERS SAR), have a wider illuminated swath width (500 km as
opposed to 100 km), much coarser resolution (50 km, with a
processed pixel spacing of 25 km) and more frequent coverage
(near-daily at Arctic latitudes as opposed to 35 days for ERS
SAR). Wind scatterometers therefore allow frequent radar
imaging over large areas but with coarser spatial resolution
than can be achieved with SAR.

[Source: University of California-Los Angeles]