作者：周守勇

1月29日，吉林省测绘局在长春组织召开了“吉林省范围内1980西安坐标系至CGCS2000坐标系整体转换系统”项目专家验收会，此研究项目通过专家验收。

　　专家组听取了项目有关建设情况报告，审阅了相关资料，进行了质询和讨论。专家组认为该项目成果理论依据正确，技术路线科学合理，达到项目预期目标，实现了将控制点、地形图由1980西安坐标系向CGCS2000坐标系的转换。同时，系统还具备地形图图廓坐标转换改正数的计算功能，为4D测绘产品的坐标系统转换提供了数据基础。完全满足基础测绘工作需要，成果具有创新性。

　　该项目由吉林省基础地理信息中心承担，是基于“二维七参数”坐标转换数学模型，通过构建Delaunay三角形，并使用双线性内插方法建立了吉林省范围内统一的1980西安坐标系至CGCS2000整体转换的数值模型，经外部检核，坐标转换精度达到了厘米级。该项目针对E00格式的数字线划地形图坐标系统转换，采用细划转换单元、逐点转换的方法，实现了E00格式DLG数据的无缝转换，解决了转换过程中地形图接边问题。通过数值模型的程序封装，提高了工作效率。

January 29, Changchun, Jilin Province Bureau of Surveying and Mapping organized a "within the framework of Jilin Province, 1980 Xi'an CGCS2000 coordinate system coordinate system to the whole conversion system" project acceptance will be experts in this research project acceptance by experts.

Expert Group heard a report on project-related construction, review the relevant information and conduct a question and discussed. The Group believes that the correct theoretical basis for the results of the project, technical scientific and rational route to achieve the project targets, achieved the control points, topographic maps from 1980 to CGCS2000 Xi'an coordinate system coordinate system conversion. At the same time, the system also has topographic map contour coordinate transformation to correct the number of computing power, surveying and mapping products for the 4D coordinate system conversion provides a data base. Fully meet the needs of basic surveying and mapping work, results with innovative.


The project is undertaken Geomatics Center of Jilin Province, is based on "two-dimensional seven-parameter" coordinate transformation mathematical model, by constructing Delaunay triangle, and use the bilinear interpolation method of Jilin Province was established in 1980 within the framework of a unified coordinate system to Xi'an CGCS2000 conversions of the numerical model as a whole by an external check, coordinate transformation of the centimeter level accuracy. The project addresses the E00 format of Digital Line topographic map coordinate system conversion, convert units using fine-drawn, point by point conversion method, realized the E00 format DLG data in a seamless conversion, the conversion process to resolve topographic maps Edge problem. Numerical model of the program through the package, improve work efficiency.