When associating a meteo file to the project site, the program can perform altitude corrections on the meteo data (irradiation and temperature).

It is however to be noted that these altitude corrections, established for Switzerland according to Meteonorm studies in monthly values (Bremer 86), have not really been validated for an hourly behavior, neither for local phenomena such as sheet of morning fog, which cannot be realistically taken into account. On the other hand, we do not apply this correction on diffuse irradiation, as the increase in irradiation with altitude mainly affects the beam component.