Multiangle Backscattering Observations of Continental Surfaces in Ku-Band (13 GHz) From Satellites: Understanding the Signals, Particularly in Arid Regions

Abstract : Backscattering in Ku-band (13 GHz) over continen- tal surfaces is analyzed, with the Tropical Rainfall Measurement Mission/Precipitation Radar instruments (incidence angles from 0 ◦ to 18 ◦ ), along with observations from the Topex–Poseidon nadir-looking altimeter and the QuikSCAT scatterometer (inci- dence angles around 50 ◦ ). The signals from the three instruments are very consistent. The backscattering tends to decrease with increasing vegetation density, as expected, making it possible to classify vegetation density with active microwaves. Over the northern African desert, a very large spatial variability of the backscattering is observed, with both surface and volume scatter- ings contributing to the signals. The use of multiangle observations does help characterizing the desert types, but in some areas, the ambiguity of the signals is still unexplained. The French–Chinese joint mission “Chinese–French Oceanic SATellite” will carry two active microwave instruments with a large range of incidence angles, from 0 ◦ to 50 ◦ . We show that the combined use of ob- servations at low and high incidence angles adds information, particularly over desert surfaces.
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IEEE Transactions on Geoscience and Remote Sensing, Institute of Electrical and Electronics Engineers, 2015, 53 (3), pp.1364 - 1373. 〈10.1109/TGRS.2014.2338913〉
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Soumis le : vendredi 18 novembre 2016 - 13:06:46
Dernière modification le : mardi 29 mai 2018 - 12:50:29

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Catherine Prigent, Filipe Aires, Carlos Jimenez, Fabrice Papa, Jack Roger. Multiangle Backscattering Observations of Continental Surfaces in Ku-Band (13 GHz) From Satellites: Understanding the Signals, Particularly in Arid Regions. IEEE Transactions on Geoscience and Remote Sensing, Institute of Electrical and Electronics Engineers, 2015, 53 (3), pp.1364 - 1373. 〈10.1109/TGRS.2014.2338913〉. 〈hal-01399116〉

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