相邻多边形共享边界的一致化改正  

Consistency Correction of Shared Boundary between Adjacent Polygons

作　　者：艾廷华[1] 毋河海[1] 

机构地区：[1]武汉测绘科技大学土地科学学院,武汉市珞喻路129号430079

出　　处：《武汉测绘科技大学学报》2000年第5期426-431,共6页Geomatics and Information Science of Wuhan University

基　　金：国家测绘局测绘科技发展基金!资助项目 ( 980 2 0 )

摘　　要：针对相邻多边形叠置不能保证精确的拓扑邻近 ,往往产生大量的“碎片”和“缝隙” ,破坏了面状目标间的拓扑一致性这一问题。依据相邻多边形之间的空间关系 ,将共享边界不一致区分为相交型、相离型、交织型 ,将拓扑一致化处理的操作分为咬合式处理和平差式处理 ,并基于Delaunay三角网模型邻近分析 ,探测由三角形集表达的边界不一致局部区域 ,通过三角网骨架线提取来进行边界不一致改正。Consistency,one of spatial data quality characteristics,plays an important role in such fields as spatial analysis,spatial query and spatial decision making.Only when spatial data is topological consistent,can GIS application obtain reliable quality.But GIS data is captured from various application sources in different time with different resolution,integration of multi_scale spatial data inevitably has inconsistent problems.Data handling,such as map generalization also destroys consistency.So it is necessary to find special strategy to preserve data consistency. In the process of adjacent polygon integration,the inconsistency of shared boundaries is a common question.Neighbor polygon overlay is not able to strictly guarantee topological consistent but generate series of fragment area and gap area in overlap region.For polygon map data,such as land_use,vegetation,and soil class,the boundary should be consistent and all polygons should cover the whole region without gap or overlap area.Shared boundary correction is also a necessary operation in polygon map generalization,representing as conversion from visual neighbor relation to topological neighbor relation between polygons.From this perspective,spatial relation generalization is one of important contents in map generalization.To correct the inconsistency between polygon boundaries,this paper offers different solutions based on spatial neighbor relation analysis.Three cases of inconsistency are distinguished : intersecting,separating and interlacing. Intersecting inconsistency causes small fragment area and separating inconsistency causes short gap area. Correction of inconsistent shared boundary is to find single line which can approximate two original boundaries with high location precise. Considering the different importance of two neighbor polygons locating beside corrected boundary, we provide two correction approaches: less important polygon to snap its neighbor,and equal polygons evenly to adjust their shared boundary.So 6 correction methods need to be

关 键 词：地图综合 共享边界 相邻多边形 一致化改正 

分 类 号：P283.1[天文地球—地图制图学与地理信息工程]