Background: Soil Moisture Observation
		Passive microwave remote sensing of soil moisture is limited by vegetation and roughness.
		Ø Fortunately, simulations generally show soil moisture is important where we can measure it. SMMR, TRMM, SSMI, AMSR, SMOS, HYDROS, etc…
	SMMR Polarization Ratio Mean				SMMR Polarization Ratio Standard Deviation