91.

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In order to retrieve the surface target reflectance, ρ_s, Equation (1.10) is further expanded as:

(1.11)

If we define

 

then Equation (1.11) eventually gives:

(1.12)

Thus, knowing the apparent reflectance ρ*, the spherical albedo S, and the coefficients A and B, the surface target reflectance ρ_s can be obtained. Methods for obtaining these parameters are illustrated below.

1.3.2.2 Steps In atmospheric correction

The procedure to obtain estimates of the ground target reflectance involves three steps, as illustrated in Figure 1.10. The first step, converting the pixel

Figure 1.10 Procedure for retrieving ground radiance.

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