Implementation of correcting digital topographic map elevation based on mathematical model

Taking Ningbo Yinzhou downtown 1:500 digital topographic map elevation correction project as an example,a bulk digital topographic map elevation correction method is introduced.The situation with survey area,the author adopts a different region different mathematical models to establish the method of correction.The paper describes the whole process of choice of elevation correction control points,surveying and establishes the elevation correction model,the program to achieve correction,and the reliability of the correction results was verified.The experiment shows that through the establishment of mathematical model approach to achieve the purpose of elevation correction can effectively improve the work efficiency and significantly reduce the amount of work outside.