Abstract
In this study, the sensitivity of spatial and temporal resolutions in sunshine modeling was numerically analyzed for the blocking effects of buildings on sunshine duration. Three-dimensional topography and buildings in the target area were numerically constructed with the spatial resolutions of 10 m, 5 m, and 1 m, based on the geographic information system(GIS) data. The solar position(azimuth and altitude angles) for the target area was calculated with the temporal resolutions of 60 min, 30 min, and 10 min on the winter solstice in 2020. The solar azimuth and altitude angles were reasonably well calculated in this study, compared with the data provided by Korea Astronomy and Space Science Institute [RMSE = below 0.3° and R<sup>2</sup> = 0.999 for the solar azimuth angles, RMSE = about 0.3° ~ 0.4° and R<sup>2</sup> = 0.999 for the solar altitude angles]. The sensitivity of spatial and temporal resolutions in sunshine modeling was 3.28 % ~ 11.37 % and 2.07 % ~ 6.84 % for the gross shadow area in the study domain, respectively. It is also suggested that the surface boundary condition with high resolution should be necessary for sunshine modeling.
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