The NASA Soil Moisture Active Passive (SMAP) mission, launched in 2015, has over 10 years of global L-band radiometry observations. The low frequency [1.4 GHz frequency or 21 cm (8 in) wavelength] ...
Farmers near Meeker, in northwestern Colorado, have been diverting water from the White River to flood their fields for irrigation for more than 100 years.
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