梯形面片数据模型及其空间运算应用  

Trapezoidal-Mesh Based Data Model for Spatial Operations

作　　者：王结臣[1] 崔璨[1] 陈刚[1] 蒲英霞[1] 

机构地区：[1]南京大学地理信息科学系,江苏南京210093

出　　处：《测绘科学技术学报》2011年第2期141-145,共5页Journal of Geomatics Science and Technology

基　　金：国家基础科学人才培养基金资助项目(J0630535)

摘　　要：提出一种新的基于梯形面片的空间运算方法,该方法将多边形要素预先分解成一系列的梯形面片,后续的空间运算将不再基于原始多边形要素进行操作,而是对分解产生的梯形面片进行更为简便的计算处理。梯形面片模型结合了常见矢量数据模型数据精度高、栅格数据模型运算简单等优点,在执行相关空间运算中与常见矢量和栅格模型相比具有优势。详述了该数据模型,并以点面包含分析和多边形叠置分析等实例探讨了其在空间运算中的应用,测试与分析表明该方法兼具数据精度高、算法实现简单等优点,能较有效地提高空间运算的执行效率。A new spatial data model was presented based on trapezoidal-mesh for implementing spatial operations within GIS.The involved polygon features were decomposed into a series of trapezoidal-meshes.Then,the geo-processing operations were deployed on these meshes rather than the original polygon features,resulting in a relatively simple computation.As a kind of model designed by integrating raster with vector,it had outstanding advantages over other models when carrying out spatial operations.The concept of this data model and two extensive examples of its application in spatial operations were demonstrated.It has been proved that the adoption of the trapezoidal-mesh model has greatly improved the efficiency of spatial operations in GIS software.

关 键 词：梯形面片 空间数据模型 多边形叠置分析 空间运算 地理信息系统 

分 类 号：P208[天文地球—地图制图学与地理信息工程]