ESUN, Exoatmospheric Solar Irradiance, Beberapa Sensor

ESUN = SI = Exoatmospheric Solar Irradiance (W/m2)

Formosat 2:

Band 1 = 136,7

Band 2 =147,6

Band 3 =93,2

Band 4 =148,8

ALOS-AVNIR2

Band 1 =1959

Band 2=1851

Band 3=1546

Band 4=1061

Landsat 7

Band 1 =1969

Band 2 =1840

Band 3 =1551

Band 4=1044

Band 5 =225,700

Band 7 =82,07

Band 8 =1368

 

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Konversi TOA Radiance ke  TOA Reflectance (ρ)

ρ=(π*Lλ *d^2)/(Esunλ *cosθ)

dimana:
ρ = Unitless Planetary Reflectance
Lλ = Spectral Radiance at The Sensor’s Aperture
d2 = Earth-Sun Distance in Astronomical Units
ESUNλ = Mean Solar Exoatmospheric Irradiances
θ = Solar Zenith Angle in Degrees