城市 DLG 基础地理信息数据库的建立方法研究

本文以FME为转换平台,以某市数字化地图为例,通过对DLG数据进行分析预处理,并设计转换方案,设置转换流程及模型函数等,构建了CAD的DWG数据到GIS的GDB数据的无损转换模型。本文共构建了8个转换模型,包括高程点转换模型、控制点转换模型、水系转换模型、居民地转换模型、交通转换模型、植被转换模型、地物附属层转换模型、分幅表接边线转换模型,成功的转换了两种数据。结果表明,实验基本实现了CAD的DWG数据到GIS的GDB数据的空间和属性信息的快速、无损转换,转换结果基本没有属性信息丢失,为地图数据共享提供了可行的解决方案。

City DLG Fundamental Geographic Information Database Building Method

In this paper,FME software platform for the conversion to digital city map,for example,the first of the DLG data analysis,and the corresponding pre-processing work to do,and then design the corresponding CAD data to GIS data conversion layer,and follow the attribute relationships design principles,to establish properties of each model’s spatial database table.Finally,through the design of conversion programs to create conversion flow charts,design conversion process and add the appropriate transform function,and ultimately build a CAD-DWG data to GIS lossless conversion of the GDB data model.This total conversion model to build eight,respectively,elevation point conversion model,the control point conversion model,the water conversion model,residential conversion model,traffic conversion model,vegetation conversion model,the feature sub-layer switching model,there is an auxiliary class then the edge of the framing table conversion model,the successful conversion of the two data.The results show that the experimental realization of the basic DWG CAD data to GIS for the GDB data attribute information of spatial information and fast,lossless conversion,the conversion results are basically no attribute information is lost,the map data sharing provides a viable solution.