Several satellites are now in earth orbit and are designated for measuring certain
terrestrial processes. As each satellite has its own overpass characteristics in terms of
return period, local overpass time, pixel size and number of spectral bands, the
applications vary (Table 5). A combination of spatial and temporal resolutions determines
the possible application. Agro-ecological zones are, for instance, preserved during a time
span of a few years and a limited number of images in an annual cycle are sufficient to
describe them whereas cloud conditions, which can vary every 30 min, require a large
number of images. Hence, a fleet of different sensors is required to make a range of
applications feasible.
Several satellites are now in earth orbit and are designated for measuring certainterrestrial processes. As each satellite has its own overpass characteristics in terms ofreturn period, local overpass time, pixel size and number of spectral bands, theapplications vary (Table 5). A combination of spatial and temporal resolutions determinesthe possible application. Agro-ecological zones are, for instance, preserved during a timespan of a few years and a limited number of images in an annual cycle are sufficient todescribe them whereas cloud conditions, which can vary every 30 min, require a largenumber of images. Hence, a fleet of different sensors is required to make a range ofapplications feasible.
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