By using the satelital information of Earth observa tion unloaded by a station constructed in the count ry and reflectances measurements of the soil, we found the total radiat ion attenuation of the atmosphere for a small regio n of the Colombian territory. It was necessary to use the Fourier's t heory that describes the ideal filters of signals t o find the transfer functions between the spectral response of an spectroradiomet er and the satelital sensor, whose radiative sign w e are going to calibrate. After that, we used the reflectance spec trum of the soil taken with our spectroradiometer, the information in digital numbers (DN) of a pixel of the satelital im age of the same region at the same time, and using again the theory of ideal filters we found the transfer function betwee n the responses of both sensors to the radiance of the soil. The relation between both signals provides us the total intensit y of the radiation attenuation of the atmosphere fo r pixel, which is fundamental to do a radiometric calibration of the whole image. We found a factor of atmosphere attenuation of the radiation ( λ between 430nm to 830nm ) from the soil (of the p ixel surface) of HTotal (�)Atmosphere = 1,435x 10 -3 .