基于数学模型的数字地形图高程改正的实现

Implementation of correcting digital topographic map elevation based on mathematical model

以宁波市鄞州中心城区1∶500数字地形图高程改正项目为例,介绍批量实现数字地形图高程改正的方法。结合测区情况,采用按不同区域建立不同的数学模型的方法进行改正。叙述从外业高程改正控制点的选择、施测和内业高程改正数据模型的建立、程序实现改正的全过程,并对改正结果的可靠性进行验证。实践证明,通过建立高程改正数学模型方法能达到高程改正的目的,可有效提高工作效率,减轻外业工作量。

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.