[M-ZZ39] Scientific, technical, and educational aspects of renewable energy

[MZZ39-P02] Cloud-base height derived from all-sky images: methods, validations, and applications

Hou Hung-Chun¹、Pan Chen-Jeih²、Lai Hsin-Chih^3,4、*楊 時賢³ (1.東北大学、2.Department of Space Science and Engineering, National Central University, Taiwan、3.Environmental Research and Information Center, Chang Jung Christian University, Taiwan、4.Department of Green Energy and Environmental Resources, Chang Jung Christian University, Taiwan)

キーワード：全天球カメラ、雲底の高さ、雲量、太陽エネルギー

An all-sky imager (ASI) observes the sky at its location. The cloud cover and solar irradiance derived from images present the information only at the ASI station. Within cloud-base height (CBH), an all-sky fisheye image (clouds taken from the ground) can be converted to a cloud map (as seen from the sky) in the geographic coordinate system, showing the spatial distribution of clouds beyond the ASI station and maximizing the observational value an ASI may have. Therefore, we have designed two and one methods using the images recorded by dual and single ASI, respectively. The results of each method are compared with several kinds of external CBH data, including ceilometer, radiosonde, and satellite observations. We will also introduce our three campaigns for CBH measuring. Finally, we conclude that the single ASI method seems to be the most promising one to be employed to derive CBH using the ASI network in Taiwan.