Determining the energy balance through the use of remote sensing in different types of land use and occupation in the northwestern region of São Paulo, Brazil.
DN ε [1,2Q]
Where Q is an integer representing the bits. LISS III is 8 bit data.
Lrad = (DN/MaxGray)*(Lmax – Lmin) + Lmin.
Lrad: Radiance for a given DN value.
DN: Digital Count.
MaxGray: IRS-1C/1D: 255 for Corrected products.
For IRS-P6: 255 for LISS-3&4, 1023 for AWiFs for corrected products
Lmin/Lmax: Minimum/Maximum radiance value for a given band and unit is mw/cm2/str/um.
E λ = E0 [ 1.00011 + 0.034221 cos x + 0.00128
sin x + 0.000719 cos 2x + 0.000077 sin 2x]
where,
E λ : Irradiance value in W/m2
E0 : Average irradiance 1366.9977 w/m2.
x = 2π (dn - 1) / 365
r λ = Lλ / Eλ
where,
r λ : spectral reflectance is expressed as a percentage.
L λ : Radiance for a given DN value.
Eλ : Irradiance value of particular day.
Ρ = ∫ r λ E (λ) dλ
where,
Ρ : Bidirectional Reflectance Distribution Function.
r λ : Spectral reflectance is expressed as a percentage.
E0 (λ) : Solar irradiance of each wavelengh band in w/m2.
α(λ,θ0) = Fu(λ,θ0) / Fd(λ,θ0)
where,
α(λ,θ0) : albedo value in no unit.
Fu(λ,θ0) : upwelling radiative flux in mw/cm2.
Fd(λ,θ0) : downwelling radiative flux in mw/cm2.
λ : wavelength in micrometer.
θ0 : solar incidence angle in degree.
U try using above formula in Envi band math or Matlab
There is a portal "BHUWAN", ISRO India. You go there and you can download the albedo data free for Indian regions.
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