Abstract:

This study provides scientific basis for relevant departments of agriculture and forestry apply ViewGIS3.0 to calculate the local direct solar radiation intensity and regularity of distribution. Through the on-the-spot observation of Shanxi pinglu area loess hilly region, hilly gentle slope aeolian area, soil stone mountain area and alluvial plain of four different site types of direct solar radiation values, which contrasts analysis with simulation obtains direct radiation simulation values by ViewGIS. Research shows: ViewGIS3.0 is over 90% of the simulation accuracy for direct solar radiation instant values; the simulation error of daily cumulative radiation is less than 5% in the condition of clear sky, the error is less than 10% in the condition of partly cloudy; the clouds are the main reasons to make the error increasing. It proves that this software can completely achieved satisfactory results to calculate one day or over several days of direct solar radiation, and that have important practical values.