In metadata file Lmin and Lmax has been given. Also Saturation radiance and solar radiance has been given. I want to perform it in ENVI.
It is easy to perform this operation for satellites like landsat, sentinel as the method is predefined in software itself.
Assuming that there has been an atmospheric correction to the data, then the formula for radiance L in a particular band is DN = [(L-Lmin)/(Lmax-Lmin)]2^n, where DN is the digital number recorded satellite value for each pixel, n is the dynamic range in bits (n = 8, 10,11,...). Solving this formula for L you get the radiance.
Hello Kumar,
Kindly look at this paper.
https://www.mdpi.com/2072-4292/11/24/2947/pdf
The formulas for calculating this parameter assume the knowledge of the wavelengths related to the spectral responses The value of this parameter is obtained starting from the gray level (gray level) or newer DN (digital number) multiplied by the sampling interval of the respective spectral band but taking into account the number of bits on which the pixel between 8 and 12 bits is represented.
I tried the formula and was able to calculate TOA reflectance. But beyond that I need to reach to surface reflectance.
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