Shuangxi Miao, Chengqi Cheng, Weixin Zhai, Fuhu Ren, Bo Zhang, Shuang Li, Junxiao Zhang, Huangchuang Zhang. A Low-Altitude Flight Conflict Detection Algorithm Based on a Multilevel Grid Spatiotemporal Index. ISPRS Int. J. Geo-Information, 8(6):289, 2019. [doi]
Abstract is missing.