基于Arcpy和NumPy的DEM的投影形变分析方法

A Projection Deformation Analysis Method of DEM Based on Arcpy and NumPy

城市独立坐标系建立时必须考虑投影带和投影面的设置,传统的方法一般基于高等级控制点的坐标成果进行计算,但不够准确和全面。近年来,高精度数字高程模型(digital elevation model,DEM)成果逐渐应用于投影形变计算。根据DEM易于读取和计算的特点,基于Arcpy和Numpy实现其投影形变计算和分析,以及投影结果制图与输出的标准化和自动化。该方法计算效率高,结果准确可靠且可视统一,可用于大型建设工程独立坐标系的建立。

In the establishment of urban independent coordinate system,the setting of projection zone and projection elevation plane must be considered.The traditional method is generally based on the coordinate results of high-level control points,but it is not accurate and incomprehensive.In recent years,high-precision DEM results are gradually applied to the calculation of projection deformation.According to the characteristics of DEM such as being easy to read and calculate,this paper realizes the calculation and analysis of projection deformation based on Arcpy and Numpy,as well as the standardization and automation of the mapping and output of projection results.This method has high efficiency,accurate and reliable results,and can be used for the establishment of independent coordinate system of large-scale construction projects.