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)(TwTdesea <br />EToTcTsEToETas)( <br />Air vs surface psychrometry <br />(Thermometer vs Satellite Psychrometry) <br />Large temp difference is a result of dry air (low RH) and hence low <br />vapor pressure <br />Large temp difference is a result of dry soil (low soil moisture) and <br />hence low actual ET <br />Vapor pressure/relative humidity (standard psychrometry) <br /> Actual ET (Satellite Psychrometry Approach: SPA)