수치표고모델, 3차원 카메라이미지자료 및 복사모델을 이용한 Sky Line과 Skyview Factor에 따른 강릉원주대학교 복사관측소 관측환경 분석
Analysis of Observation Environment with Sky Line and Skyview Factor using Digital Elevation Model (DEM), 3-Dimensional Camera Image and Radiative Transfer Model at Radiation Site, Gangneung-Wonju National University
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초록
To investigate the observational environment, sky line and skyview factor (SVF) are calculated using a digital elevation model (DEM; 10 m spatial resolution) and 3 dimensional (3D) sky image at radiation site, Gangneung-Wonju National University (GWNU). Solar radiation is calculated using GWNU solar radiation model with and without the sky line and the SVF retrieved from the 3D sky image and DEM. When compared with the maximum sky line elevation from Skyview, the result from 3D camera is higher by 3o and that from DEM is lower by 7o. The SVF calculated from 3D camera, DEM and Skyview is 0.991, 0.998, and 0.993, respectively. When the solar path is analyzed using astronomical solar map with time, the sky line by 3D camera shield the direct solar radiation up to 14o with solar altitude at winter solstice. The solar radiation is calculated with minutely, and monthly and annual accumulated using the GWNU model. During the summer and winter solstice, the GWNU radiation site is shielded from direct solar radiation by the west mountain 40 and 60 minutes before sunset, respectively. The monthly difference between plane and real surface is up to 29.18 MJ m−2 with 3D camera in November, while that with DEM is 4.87 MJ m−2 in January. The difference in the annual accumulated solar radiation is 208.50 MJ m−2 (2.65%) and 47.96MJ m−2 (0.63%) with direct solar radiation and 30.93 MJ m−2 (0.58%) and 3.84 MJ m−2 (0.07%) with global solar radiation, respectively.
Abstract
To investigate the observational environment, sky line and skyview factor (SVF) are calculated using a digital elevation model (DEM; 10 m spatial resolution) and 3 dimensional (3D) sky image at radiation site, Gangneung-Wonju National University (GWNU). Solar radiation is calculated using GWNU solar radiation model with and without the sky line and the SVF retrieved from the 3D sky image and DEM. When compared with the maximum sky line elevation from Skyview, the result from 3D camera is higher by 3o and that from DEM is lower by 7o. The SVF calculated from 3D camera, DEM and Skyview is 0.991, 0.998, and 0.993, respectively. When the solar path is analyzed using astronomical solar map with time, the sky line by 3D camera shield the direct solar radiation up to 14o with solar altitude at winter solstice. The solar radiation is calculated with minutely, and monthly and annual accumulated using the GWNU model. During the summer and winter solstice, the GWNU radiation site is shielded from direct solar radiation by the west mountain 40 and 60 minutes before sunset, respectively. The monthly difference between plane and real surface is up to 29.18 MJ m−2 with 3D camera in November, while that with DEM is 4.87 MJ m−2 in January. The difference in the annual accumulated solar radiation is 208.50 MJ m−2 (2.65%) and 47.96MJ m−2 (0.63%) with direct solar radiation and 30.93 MJ m−2 (0.58%) and 3.84 MJ m−2 (0.07%) with global solar radiation, respectively.
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