Satellite revisit
Encyclopedia
The satellite revisit time 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 on to the earth of the satellite's orbit. Revisit requires a very close repeat of the Ground Trace. In the case of polar/hi inclination low earth orbiting reconnaissance satellites, the sensor payload 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 Israel
i 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.
Satellite
In the context of spaceflight, a satellite is an object which has been placed into orbit by human endeavour. Such objects are sometimes called artificial satellites to distinguish them from natural satellites such as the Moon....
.
It depends on the satellite's orbit, target location, and swath of the sensor.
"Revisit" is related to the same ground trace; a projection on to the earth of the satellite's orbit. Revisit requires a very close repeat of the Ground Trace. In the case of polar/hi inclination low earth orbiting reconnaissance satellites, the sensor payload must have the "variable swath" to look longitudinally (east-west, or sideways ) at a target, in addition to direct overflight observation, looking nadir
Nadir
The nadir is the direction pointing directly below a particular location; that is, it is one of two vertical directions at a specified location, orthogonal to a horizontal flat surface there. Since the concept of being below is itself somewhat vague, scientists define the nadir in more rigorous...
.
In the case of the Israel
Israel
The State of Israel is a parliamentary republic located in the Middle East, along the eastern shore of the Mediterranean Sea...
i EROS
EROS (satellite)
Earth Resources Observation Satellite is a series of Israeli commercial Earth observation satellites, designed and manufactured by Israel Aircraft Industries , with optical payload supplied by El-Op. The satellites are owned and operated by ImageSat International, another Israeli company, with...
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.