城市分区基准框架向CGCS2000转换模型适用性及精度分析

The Applicability and Precision Analysis of the Transformation Model from the Urban Zoning Datum Framework to CGCS2000

基于城市各区之间控制资料、地理信息数据、国土资源空间数据无缝对接需求,消除分区GNSS网整合区域裂缝,纳入城市统一的测绘基准目的,采用了北斗地基增强框架网动态七参数求解稳定重合点的方法,结合阳江市辖阳春市、阳东区、江城区、阳西县四县区二维七参数模型和二维四参数模型转换适用性和精度评估实验,实验表明:二维四参数模型在分区BJ54、XAS80与CGCS2000坐标转换时要优于二维七参数模型,符合精度均优于5 cm,具有较强的适用性和可靠性。

Based on the need for seamless connection of control data,geographic information data,and land resource spatial data among the various districts of the city,the gaps in the integration of the GNSS network of the districts have been eliminated,and the city’s unified surveying and mapping benchmarks have been incorporated.Point method,combined with two-dimensional seven-parameter model and two-dimensional four-parameter model conversion applicability and accuracy evaluation experiments in the four counties of Yangchun City,Yangdong District,Jiangcheng District,and Yangxi County under the jurisdiction of Yangjiang City,the experiment shows that:two-dimensional four-parameter model it is better than the two-dimensional seven-parameter model in the coordinate conversion of the partition BJ54,XAS80 and CGCS2000,and the accuracy is better than 5cm,and it has strong applicability and reliability.