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The satellite revisit period is the time elapsed between observations of the same point on Earth by a satellite. It depends on the satellite's orbit, target location, and swath of the sensor.
"Revisit" is related to the same ground trace, a projection of the satellite's orbit on to the Earth. Revisit requires a very close repeat of the ground trace. In the case of polar orbit or highly inclined low-Earth-orbit reconnaissance satellites, the sensor must have the variable swath, to look longitudinally (east-west, or sideways) at a target, in addition to direct overflight observation, looking nadir.
In the case of the Israeli EROS Earth observation satellite, the ground trace repeat is 15 days, but the actual revisit time is 3 days, because of the swath ability of the camera payload.
See also
- Orbit period
- Satellite watching, spotting satellites in the sky as they pass
References
- ^ Raizer, Victor (2019-03-04). Optical Remote Sensing of Ocean Hydrodynamics. CRC Press. p. 161. ISBN 978-1-351-11917-7.
- Demyanov, Vladislav; Becedas, Jonathan (2020-07-22). Satellites Missions and Technologies for Geosciences. BoD – Books on Demand. ISBN 978-1-78985-995-9.