Taking the debris flow gully of the tributary of the Dabaini River on the left bank of the middle reaches of the Xiaojiang River Basin in Dongchuan District. Yunnan Province as the research object. the surface landform data of the debris flow gully was collected by Unmanned Aerial Vehicle (UAV) remote sensing technology. This paper proposes a method of extracting the control points of... https://ufxcblih16mu.tokka-blog.com/35182274/modelling-of-efficiency-change-as-a-source-of-economic-growth-in-agriculture