Authors : Han-Kyung Yun and Sun-Min Whang
Abstract: The cloud cover in the sky has been measuring by a human eyes up to now. Instead of the eye observation, computer aided automated cloud observation is applied to get the cloud amount or cloud cover. A rising issue is how to get the cloud area, since, the boundary of cloud generally is ambiguous. Some of studies related cloud generally used values of RGB or those ratios such as red green ratio and red blue ratio, etc. The present study developed algorithm of calculating the sky zone to get the cloud amount with the whole sky image data taken the image data taken the automatic cloud observation system operated by the Metrological Administration in Korea. The cloud cover announced by the Korean Meteorological Agency is the eye observation result, even though they have an intelligent cloud observation system. The reason is the impermissible error in the result data of the automatic observation system. The proposed solution is maintenance-free but the present solution has to be supplied sky extracting filter periodically to get the exact boundary between the sky zone and the obstacle objects in horizontal line. The obtained cloud amount or cover using the proposed solution is better reliable and precise than the current automatic cloud observation system at the Meteorological Agency.
Han-Kyung Yun and Sun-Min Whang, 2018. An Automatic Solution for Quantified Measurement of Cloud Amount Using Whole-Sky Image. Journal of Engineering and Applied Sciences, 13: 9457-9460.