基于七参数实现不动产数据坐标转换的浅析

Real estate data based on seven parameters analysis of coordinate transformation

自然资源空间数据支撑着各级自然资源部门的业务需求,但是仍然存在大量自然资源空间数据使用1954年北京坐标系和1980西安坐标系的情况,导致成果基准不统一、资料拼接困难、成果应用受阻等现象,准确快速获取高精度的2000国家大地坐标系转换成果是目前迫切需要解决的问题。这里对坐标转换方法展开讨论,以遂宁市不动产登记数据转换为2000国家大地坐标系项目为例,选取不同数量和点位分布不同的控制点求解七参数,对坐标转换结果进行对比分析,分析误差来源和对应的削弱误差的措施。实验表明,选取分布均匀且能够较好覆盖整个测区范围的控制点求解七参数进行坐标转换,转换结果能够满足国家标准规定的精度要求。

Natural resources spatial data support the business needs of natural resources departments at all levels,but there are still a large number of natural resources spatial data using the 1954 Beijing coordinate system and 1980 Xi'an coordinate system,resulting in inconsistent achievement benchmarks,complex data splicing and blocked achievement application.How to accurately and quickly obtain the high-precision transformation results of the 2000 national geodetic coordinate system is an urgent problem to be solved.This paper discusses the coordinate conversion method.Taking the project of converting the real estate registration data of Suining City into a 2000 national geodetic coordinate system as an example,this paper selects different control points with different numbers and point distribution to solve the seven parameters,compares and analyzes the coordinate conversion results,analyzes the source of error and the corresponding measures to weaken the error.The experiment shows that the control points with uniform distribution and good coverage of the whole survey area are selected to solve the seven parameters for coordinate conversion.As a result,the conversion results can meet the accuracy requirements specified in the national standard.