基于DEM实现城市高斯投影变形可视化分析

Analysis and Visualization of the Urban Gauss Projection Deformation Based on DEM

关于城市坐标系统投影参数的分析,传统思路多以离散的控制点为基础资料。但随着精准规划的提出、城市体量的扩张以及国家2000大地坐标系的推广,对城市整体进行更加精细的投影变形分析显得越发重要。以分辨率高、覆盖均匀、能很好地描述城市地貌特征的DEM为数据源,通过自编软件DEM_GSPA实现了任意坐标系高斯投影变形格网分析及其可视化,并搜索验算最优基准参数。以成都市为例,在DEM基础上开展了投影变形有效控制区分析、分带分析、参数评价等系列工作。

For the analysis of projection parameters of urban coordinate system,the traditional idea is based on discrete control points. But with the proposal of precise planning,the expansion of urban volume and the promotion of national 2000 geodetic coordinate system,it is more and more important to make detailed projection deformation analysis of the whole city. To use the high resolution and uniform coverage,which can well describe the city landscape feature DEM as the data source,through the self compiled software DEM_GSPA to achieve arbitrary coordinate Gauss projection deformation grid analysis and visualization,then to further obtain and test the optimal datum parameters. Based on the Chengdu DEM,a series of work such as projection deformation effective control area analysis,zoning analysis and parameter evaluation are carried out.