改进的高精度CGCS2000格网改正量自动计算模型设计与实现

DESIGN AND IMPLEMENTATION OF AUTOMATIC CALCULATION MODEL FOR CORRECTED GRID CORRECTION OF HIGH-PRECISION 2000 NATIONAL GEODETIC COORDINATE SYSTEM

针对目前测绘数据多为54系或80系,测绘成果出现新旧坐标系不统一、不利于使用的问题。在对现有转换模型的研究基础上,提出了一种改进的高精度2000国家大地坐标系格网改正量自动计算模型,该模型通过输入点、线、面控制数据,自动采用平面四参数、Shepard拟合法或距离加权法与最小二乘相结合的方法进行坐标转换。经检验,经过此转换模型处理后,精度可达到0.001m,使1∶2 000或1∶5 000比例尺地形图转换精度得到很大提升。

For the current surveying and mapping data,most of them are 54 series or 80 series,and the mapping results show that the new and old coordinate systems are not uniform and are not conducive to use.Based on the research of the existing conversion model,an improved automatic calculation model of the high-precision 2000 national geodetic coordinate system grid correction is proposed.The model automatically adopts the plane four parameters by inputting point,line and surface control data.The Shepard fitting method or the distance weighting method combined with the least squares method performs coordinate conversion.After testing,the accuracy of the conversion model can reach 0.001 m,which greatly improves the conversion accuracy of 1∶2 000 or 1∶5 000 scale topographic map.