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Envisat
Coverage
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The ENVISAT orbit provides a 35-day repeat
cycle, the same as the ERS-2 mission.
Since the orbit track spacing varies
with latitude (the spacing at 60? latitude
is half that at the equator), the density
of observations and/or revisit rate is
significantly greater at higher latitudes
than at the equator. The flexible swath
positioning in Image Mode greatly increases
the revisit frequency compared to ERS.
Coverage is also affected by the different
swath widths of IS1 to IS7.
ASAR will operate simultaneously with the
other ENVISAT instruments. The diagram
below shows the swath positioning of ASAR
together with AATSR and MERIS coverage.
Overlap with AATSR is quite limited, but
ASAR IS1 to IS5 and most of Wide Swath
Mode coverage falls within the MERIS cover. |
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