LiOn Ground Truth Data in Correlation With ALDIS LLS Detections

This paper presents the current analysis in the section of lightning research and observation in the Austrian Alps run by Graz University of Technology in correlation with Austrian Lightning Location System detections. The project “Lightning Observation in the Alps - LiOn” was created in 2017 at the Institute of High Voltage Engineering and System Performance at Graz University of Technology. Atmospheric discharges are observed at 19 different measurement locations in Austria by using a video and field recording system. These system consists of a high speed video camera (2000 frames per second) and a flat plate antenna to measure the electric field. The recorded data can be used to better understand the atmospheric discharges, especially in the alpine area. For this analysis a data set of the measurement periods 2015 and 2017 was used for validation of the Lightning Location System data of the Austrian Lightning Detection and Information System. The LLS performance parameter location accuracy and detection efficiency for these two years have been analyzed. Values for location accuracy are in the range of 111 m and 139 m for 2015 and 2017. For flash detection efficiency 96.08 % and 98.49 % and 85.60 % and 76.34 % for the stroke detection efficiency have been calculated for 2015 and 2017 respectively.