I am trying to understand the process of Radiometric Calibration of multi-spectral images acquired using Parrot Sequoia sensor with firmware v1.2.1.
Given a radiometric calibration target and the Albedo values for all bands of interest (Red, NIR, Red-Edge), how to apply this information to get a radio-metrically calibrated image.
What is the formula to apply radiometric calibration?
Best Answer
With more than one calibration target, you can estimate the relationship between your measurement and the albedo/reflectance with a linear regression.
If you have only one calibration target, you need some more assumptions and I recommend you to use simple equations to avoid overfitting. Those are applied for each band individually.
This assumes that your software provides you with estimated reflectance/ irradiance values based on internal camera calibration parameters and (for reflectance) using the sun position, sun-earth distance and sun spectrum.