Corrected daily irradiation
Before starting the correction of daily solar irradiation, it is necessary to calculate the potential daily solar irradiation by the bbo.solar_day module.
Secondly based on data from meteorological stations is calculated current solar irradiation by bbo.solar_cday module. Method of calculation depends on the number of meteorological stations.
Input to module are first (day from) and last (day to) day of the year. For the range resulting from entered first and last day must be correction made. Furthermore, the module expects the calculated values of potential solar irradiation in psr_d<xxx> files in solar mapset.Values of solar irradiation measured at the meteorological station must be stored in a md_gsr_<i>.txt file in _DATA folder, where <i> is number of meteorological station. Files contains just two columns. In first column is number of the day of year stored and in second column is found value of global solar irradiation.
If for some day are not available the global solar irradiation data from meteorological station, the corrections are not made. Data from potential solar irradiation are copied to these raster layers.Calculation is performed in solar mapset. Mapset is set automatically before calculation. Output raster layers are named sr_d <xxx>, where <xxx> is a three-digit number of day.