高落差区域不同坐标转换方法及其精度分析  

Different Coordinate Transformation Methods and Precision Analysis in High Drop Region

作　　者：邵恒[1] 黄燕 SHAO Heng;HUANG Yan(Jiangsu Provincial Institute of Surveying&Mapping Engineering,Nanjing 210013,China;Yancheng Chaowei Geographic Information Technology Co.,Ltd.,Funing 224400,China)

机构地区：[1]江苏省测绘工程院,江苏南京210013 [2]盐城超维地理信息技术有限公司,江苏阜宁224400

出　　处：《测绘与空间地理信息》2023年第8期221-224,共4页Geomatics & Spatial Information Technology

摘　　要：为履行自然资源“两统一”职责,所有相关部门的地理数据等支撑成果均应统一基准。为确保历史资料成果的正确使用,需进行坐标转换工作,将成果统一至CGCS2000基准下。目前常用的坐标转换模型很多,本文利用4种常用的坐标转换模型对某高程落差超过200 m的区域控制成果进行实验,结果表明,4种坐标转换模型均可获得优于1 cm的转换参数,其中平面四参数较其他3种转换模型精度更优。此外,转换点控制范围以外45 km仍可获得优于2 cm的转换精度,但随着控制范围的距离增大,精度逐渐降低。In order to fulfill the responsibility of "unification of natural resources",the supporting results such as geographical data of all relevant departments should be unified.In order to ensure the correct use of historical data results,coordinate transformation is needed to unify the results under the CGCS2000.At present,there are many commonly used coordinate transformation models.In this paper,four commonly used coordinate transformation models are used to conduct experiments on the regional control results in an area with an elevation drop of more than 200 m.The results show that the four coordinate transformation models can all obtain conversion parameters better than 1 cm,but the plane four parameters are more accurate than the other three transformation models.In addition,45 km beyond the control range of the switching point can still obtain a conversion accuracy better than 2 cm,and with the distance of the control range,the accuracy gradually decreases.

关 键 词：平面四参数 Bursa七参数 三维七参数 多项式拟合 高落差 

分 类 号：P226.3[天文地球—大地测量学与测量工程]