  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}.
