Remote Sensing and Soil Thermal Properties:. Conductivity, Heat Capacity, and Electromagnetics! OH MY!. Eric Russell 4/9/2010 Agron 577: Soil Physics. Outline. What is remote sensing? Microwave remote sensing Very basic electromagnetics
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Conductivity, Heat Capacity, and Electromagnetics! OH MY!
Agron 577: Soil Physics
J = εσT4 , where ε = emissivity and σ = 5.67x10-8 [W/m2K4]
l = wavelength, b = 2.8977685(51)×10−3 m·K
where Tb = brightness temperature (K), T = temperature of material (K), and ε = emissivity
where k = Boltzmann constant,
c = speed of light, Tb = brightness temperature, and λ= wavelength.
where DG = variation in surface heat flux, DT = Tmax – Tmin, and ω = 2p/86400s
Right: Daytime temperature over bare soil
Minacapilli and Blanda 2009
(a) Ground heat flux G ≡ Q(0, t) (W m−2), and (b) surface (skin) temperature Ts ≡ T(0, t) (°C) measured at the Lucky Hill site in the Walnut Gulch Watershed, 5–16 June 2008.
Wang et al 2010
Right: Normalized soil thermal inertia Kp as a function of degree of saturation (normalized q)
Lu et al. (2009)