使用分光辐射计对地球观测卫星传感器进行辐射in-situ校准
Radiometric in-situ calibration of satelital sensors of Earth observation using a spectroradiometer
摘要：
通过使用由该国建造的一个台站卸载的地球观测卫星信息和土壤反射率测量，我们发现了哥伦比亚领土上一个小区域的大气总辐射衰减。利用傅立叶理论中描述信号理想滤波器的理论，求出光谱辐射计的光谱响应与待标定的卫星传感器的光谱响应之间的转换函数。然后，利用分光辐射计采集的土壤反射光谱和同一时间同一区域卫星图像像素的数字信息，再次利用理想滤波器理论，求出了两种传感器对土壤辐射响应之间的转换函数。这两种信号之间的关系为我们提供了像素的大气辐射衰减的总强度，这是对整个图像进行辐射定标的基础。我们发现大气对来自土壤（像素表面）的辐射（λ在430 nm到830 nm之间）的衰减系数为H_{Total(λ)Atmosphere} = 1，435 x 10^{-3}。
英文摘要：
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 (λ between 430nm to 830nm) from the soil(of the pixel surface) of H_{Total(λ)Atmosphere} = 1,435x 10^{-3}.
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