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Calculating the mean exoatmospheric irradiances and ground reflectances

Sometimes, when using a new satellite data type for atmospheric correction, the following question arises: how to define the mean exoatmospheric solar irradiances for a certain band? Either we need the band limits, or, preferably, the relative signal response curves (RSR) of the instrument (plus the Solar irradiance spectrum).

We can calculate the bandwise mean irradiances relatively easily, but the possibility to do this is generally not in the existing commercial image processing and mapping softwares. Here, we made a simple procedure into MS Excel.

Another application for this process is to convolve the response curves with some ground surface reflectance curve measurements, to produce reflectance percentages that the satellite “should see”.

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WM-data Novo
Valimotie 15 B
00381 Helsinki
Finland
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