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CBERS-1, 2 and 2B Orbit

CBERS has a sun-synchronous orbit with an altitude of 778 km, completing about 14 revolutions per day. The local solar time at the equator crossing is always 10:30 a.m., thus providing the same solar illumination conditions for comparing images taken in different days.



Orbit Altitude: 778 km Inclination: 98.504.º Period: 100,26 min.

Image Credits: CBERS/INPE.


It takes 26 days for the satellite to revisit the same Earth location. This is the time necessary to image the entire Earth with the CCD and the IRMSS cameras that have narrow fields of view. On the other hand, using the WFI camera which is able to take images 890 km wide, the time required for a global coverage is 5 days.

IRMSS is not be available in CBERS-2B. In its place HRC - High Resolution Panchromatic Camera - is present, with 2.7 m pixel in a wide visible band. Since HRC covers 27 km only, a special imaging strategy is adopted, so that Brazil has a complete coverage at high resolution in every five cycles imaging of 26 days, i.e. every 130 days. In every 26 days cycle, the whole territory is covered by the CCD (which has a 113km imaging swath), however a part only is covered by the HRC (with a 27 km imaging swath). Therefore, about five imaging cycles are necessary for the 113km CCD swath to be completely covered by the 27km HRC swath. Hence, for every five complete CCD coverages only one HRC complete coverage is obtained.

The sideways pointing capability of the high resolution CCD camera combined with the type of satellite orbit provides stereoscopic vision capability for a given region with an interval of 3 days between the two elementary images.
Realization
Image Catalog
Brasília (DF)
Images CBERS-2 - Camera CCD
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