Soil moisture mapping in a semiarid region, based on ASAR/Wide Swath satellite data
- Zribi, Mehrez
- Kotti, Fatma
- Amri, Rim
- Wagner, Wolfgang
- Shabou, Marouen
- Lili-Chabaane, Zohra
- Baghdadi, Nicolas
DOIAbstract
International audienceIn this paper, an operational algorithm is proposed for the mapping of surface moisture over the northern and central parts of Tunisia, in North Africa. A change detection approach is applied, using 160 multiincidence Envisat ASAR Wide Swath images acquired in the horizontal polarization over a 7 year period. Parameterization of this algorithm is considered for three classes of vegetation cover density (NDVI<0.25, 0.250.5), retrieved from SPOT-VGT decadal images. A relative soil moisture index, ranging between 0 (for the driest surfaces) and 1 (for saturated soils), is proposed for each date, with a resolution of 1 km. The retrieved soil moistures are validated by means of ground measurements based on continuous thetap...
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