Radiometric in-situ calibration of satelital sensors of Earth observation using a spectroradiometer

TL;DR

This paper presents a method for radiometric in-situ calibration of Earth observation satellite sensors using spectroradiometer measurements and Fourier theory to determine atmospheric attenuation over a specific Colombian region.

Contribution

It introduces a novel calibration approach combining soil reflectance spectra and Fourier-based transfer functions to accurately estimate atmospheric attenuation for satellite sensors.

Findings

Estimated atmospheric attenuation factor of 1.435x10^{-3} between 430nm and 830nm.

Method enables precise radiometric calibration of satellite images using in-situ measurements.

Applicable to small regional areas for improved Earth observation accuracy.

Abstract

By using the satelital information of Earth observation unloaded by a station constructed in the country and reflectances measurements of the soil, we found the total radiation attenuation of the atmosphere for a small region of the Colombian territory. It was necessary to use the Fourier's theory that describes the ideal filters of signals to find the transfer functions between the spectral response of an spectroradiometer and the satelital sensor, whose radiative sign we are going to calibrate. After that, we used the reflectance spectrum of the soil taken with our spectroradiometer, the information in digital numbers (DN) of a pixel of the satelital image of the same region at the same time, and using again the theory of ideal filters we found the transfer function between the responses of both sensors to the radiance of the soil. The relation between both signals provides us the total intensity of the radiation attenuation of the atmosphere for pixel, which is fundamental to do a radiometric calibration of the whole image. We found a factor of atmosphere attenuation of the radiation ({\lambda} between 430nm to 830nm) from the soil(of the pixel surface) of H_{Total({\lambda})Atmosphere} = 1,435x 10^{-3}.