Rudiger C., Walker J. P., Kerr Yann. (2011). On the airborne spatial coverage requirement for microwave satellite validation. Ieee Geoscience and Remote Sensing Letters, 8 (4), p. 824-828. ISSN 1545-598X.
Titre du document
On the airborne spatial coverage requirement for microwave satellite validation
Ieee Geoscience and Remote Sensing Letters, 2011,
8 (4), p. 824-828 ISSN 1545-598X
With the recent launch of the Soil Moisture and Ocean Salinity (SMOS) mission, the passive microwave remote-sensing community is currently planning and undertaking airborne validation campaigns. Given the financial and logistical constraints on the size of validation area that can be covered by airborne simulators and the experiments underway that cover only a part of a satellite footprint, timely and scientifically sound advice on fractional footprint coverage requirements by campaigns for these low-resolution sensors is of paramount importance. Using high-resolution airborne data from an extensive airborne campaign in Southeast Australia, the fractional coverage requirement for L-band passive microwave satellite missions is assessed using a subsampling technique of flight lines through a passive microwave footprint. It is shown that minimum 50% coverage of the total footprint size will typically be required, given a spatial variability value of 20 K at 1-km resolution, to ensure that the footprint mean is estimated with an expected sampling error of less than 4 K, which is the design sensitivity of SMOS.
