Evaluation of Lightning Location accuracy of JLDN with a lightning video camera system

This paper discusses evaluation of Lightning Location accuracy of Japan Lightning Detection Network (JLDN). JLDN has observed lightning activities since 1998. It has been said that the nominal location accuracy of JLDN is less than 500 meters in most area of Japan. But, the actual location accuracy of JLDN has not been evaluated. Sankosha Corporation installed lightning video camera system on the roof top of their building in Sagami Techno Center. They have observed lightning with it around Sagamihara city, Kanagawa, Japan. We show some video images and estimate actual lightning location. We compare them with location observed by JLDN. We also discuss the differences between lightning location estimated with video images and lightning location observed by JLDN. Finally, we report the actual location accuracy of JLDN regarding cloud to ground discharges in this paper.