Three-dimensional positioning method and system for defects of hydropower station unit equipment

According to the hydropower station unit equipment defect three-dimensional positioning method and system, digital precise coordinate three-dimensional scene construction is carried out based on power grid equipment laser point cloud, oblique photography, construction drawings and other multi-source data information in combination with a BIM three-dimensional model, and through standard model naming rules and attribute correspondence, three-dimensional positioning of the hydropower station unit equipment defects is realized. A unique identification mapping relation with hydraulic turbine set equipment in a hydropower station operation and maintenance monitoring system is formed, a three-dimensional twin platform of the hydropower station set equipment is constructed, actual operation and monitoring data of the hydropower station set equipment are accessed, and the state of a three-dimensional twin model is consistent with the actual hydropower station operation state. Defective unit equipment is accurately po