The traditional monitoring methods for coal mine roadway deformation have problems such as incomplete data collection. non intuitive data format. poor precision. and inability to achieve continuous monitoring of the entire roadway deformation. https://www.spidertattooz.com/Messerschmitt-Me262A-1A-Fighter-Aircraft-LT-Walter-Hagenah-III-Jagdeschwader-7-Larz-Airfield-Germany-1945-German-Luft/