CRTSIII track plate-based shape size quick calculation method

The invention discloses a CRTSIII track plate-based shape size quick calculation method. The method comprises the steps of 1) importing a standard three-dimensional design model of a CRTSIII track plate in point cloud processing software; 2) by utilizing the point cloud processing software, establishing a direct plane feature, a direct plane circle feature and a direct boundary comparison point ofthe three-dimensional model of the track plate; 3) by utilizing the point cloud processing software and the established direct plane feature, direct plane circle feature and direct boundary comparison point, establishing features such as an auxiliary point feature, an auxiliary linear feature, an auxiliary plane feature and the like of a CRTSIII track plate shape size detection item; 4) by utilizing the point cloud processing software and the established point feature, plane circle feature, linear feature and plane feature, establishing a direct distance feature and a direct angle feature ofthe CRTSIII track plate sh