Soil moisture is a much sought after data set for ecological modeling. However, data that meet the needs of a particular application are often not available because existing data spatial resolutions are too coarse, available data do not cover the area of interest, or data do not exist for the required timeframe. Global soil moisture data collected from microwave sensors is available with a 25 km resolution. People have experimented using data collected from optical remote-sensing instruments to map soil moisture but results have been mixed.
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