Water Stress Index Comparison from Information Captured by The Modis Sensor in The Argentinean Pampas Region
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Abstract
The Argentina Pampas Region exhibits a tendency to agricultural expansion that increases the economic risks because of its high dependence on weather conditions. In order to improve predictions on crop behavior, it will be studied in this paper the sensitivity of different water stress indices to soil water availability (SWA), by using satellite images in the aforementioned region. Three indices were analyzed from data gathered from field campaigns in different crops, together with satellite data. Two of these indices, Crop Water Stress Index (CWSI) and Water Deficit Index (WDI), combine satellite data with data from weather stations. The third index, Temperature-Vegetation Dryness Index (TDVI), uses satellite data only. It was observed that TDVI is the index that best results yields (r2 = 0,92). It is concluded that this index is the one that can generate appropriate diagnostics for being the most sensitive to changes in the SWA.