基于GeoDatabase的天津地方坐标系至CGCS2000坐标转换实现

Transformation of Tianjin Local Coordinate System to CGCS2000 Coordinate System Based on GeoDatabase

作为测绘成果的GIS数据多采用Geo Database数据模型进行存储和管理,为避免重复测绘,需将Geo Database数据结构的GIS数据从天津地方坐标转换至CGCS2000坐标系。本文从Geo Database数据模型的介绍入手,总结了坐标转换相关的理论,并给出了天津地方坐标系转换至CGCS2000坐标系的方法和步骤,实现了Geo Database数据结构的GIS数据从天津地方坐标系转换至CGCS2000坐标系的转换。最后分别从转换前后从图形一致性、线性方向一致性、属性一致性、坐标转换精度和坐标转换效率加以论证。

GIS Data which is one of the most important results of surveying and mapping is often stored and managed by the geodatabase data model. In order to avoid duplication of surveying and mapping,We need to transform the GIS da-ta of GeoDatabase structure from the local coordinate system of Tianjin to the CGCS2000 coordinate system.First of All, This article describes the GeoDatabase data model and summarizes the theory of coordinate transformation.Secendly,The article finds out the method and the steps of transforming the local coordinate system of Tianjin to the CGCS2000 coordi-nate system. Then, We realize the GIS data of GeoDatabase structure transforming from the local coordinate system of Tianjin to the CGCS2000 coordinate system with the experiment.Finally,it is proved effective and feasible from the graph-ical consistency,the linear direction consistency,the attribute consistency,the coordinate conversion precision and the co-ordinate conversion efficiency.