1:10000基础地理信息DLG矢量数据几何结构分析

Analysis of the geometric structure of 1:10000 basic geographic information DLG vector data

基础地理信息是国家信息化建设中重要的基础性与战略性资源,是地理要素的统一定位基础和空间载体,主要包括数字正射影像数据(DOM)、地形要素数据(DLG)、数字高程模型数据(DEM)、地形图制图数据(DRG)等。文章主要针对1:10000基础地理信息地形要素数据(DLG)生产作业、质量检查中,存在对《国家基本比例尺地图图式第2部分:1:50001:10000地形图图式》(以下简称《图式》)、《基础地理信息1:10000地形要素数据规范》(以下简称《数据规范》)等技术文件的错误或歧义性理解问题,以及《图式》《数据规范》两者之间规定定义相互矛盾冲突部分问题,通过要素的符号表达和要素的规范定义,结合DLG矢量数据生产的需要,进行初步的分析。

Basic geographic information is an important basic and strategic resource in the national informatization construction.It is the unified positioning basis and spatial carrier of geographical elements,including digital orthophoto image data(DOM),terrain feature data(DLG),digital elevation model data(DEM),topographic mapping data(DRG),etc..This paper mainly aims at the production operation and quality inspection of 1:10000 basic geographic information terrain element data(DLG),which is based on"the national basic scale map schema Part 2:1:50001:The problems of error or ambiguity understanding in technical documents such as 10000 topographic map schema'*(hereinafter referred to as"schema"),"1:10000 topographic element data specification"(hereinafter referred to as"data specification"),and the contradictory and conflicting define between the"schema"and"data specification","In this paper,through the symbolic expression of the elements and the standard definition of the elements,combined with the needs of DLG vector data production,this paper makes a brief analysis.