Agile Proba-1 rolls in its orbit to take images

Agile Proba-1 rolls in its orbit to take images

Released

25/10/2011 10:46 am

Copyright

ESA

Description

For most Earth-observing satellites, image acquisition is only a matter of opening a viewing aperture but Proba-1 is different. The satellite’s platform and payload work as one: spinning reaction wheels guided by a startracker roll it up to 25º side to side and 55º along its path. This helps Proba-1 compensate for its 7.5 km/s speed, like a photographer panning to snap a moving target.

In addition, Proba-1 can record up to five differently angled views of the same target, important for researchers investigating how vegetation changes appearance with shifts in view. Understanding 'Bi-Reflectance Distribution Function' has proved beneficial for mapping and classifying land cover, from forest monitoring in Canada to crop yield predictions in Europe, Australia and China.

Rate this

  • Currently 4.5 out of 5 Stars.
  • 1
  • 2
  • 3
  • 4
  • 5
Rating: 4.6/5 (5 votes cast)

Thank you for rating!

You have already rated this page, you can only rate it once!

Your rating has been changed, thanks for rating!

Views

773