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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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