顾及地形特征语义约束的高保真地形建模方法探索
发布时间：2019-03-25 17:22
【摘要】：地形建模过程中常缺乏对地形整体特征的表达,这导致了当前地形模型中地形局部特征并不符合地形对象属性这一失真现象的出现。该文提出了"地形语义"概念来实现对地形局部特征的描述,通过语义的形式化表达实现了对其区域内高程的约束,同时设计了语义DEM(S-DEM)概念模型,基于与现有格网DEM兼容的数据结构,实现了顾及语义的内插方法,并通过建立三维原型系统实现了S-DEM的三维表达。与传统方法相比,S-DEM模型保证了地形区域特征与地形属性的一致性,确保了地形局部特征与垂直面的表达。研究结果表明,地形语义在本质上是地形对象特征的体现,同时在数据结构上依赖于地形的面向对象表达。
[Abstract]:In the process of terrain modeling, the representation of the whole terrain feature is often lacking, which leads to the appearance of the distortion phenomenon that the terrain local feature in the current terrain model does not accord with the attribute of the terrain object. In this paper, the concept of terrain semantics is proposed to describe the local features of terrain, and the constraint of elevation in the region is realized through the formal expression of semantics. At the same time, the conceptual model of semantic DEM (S-DEM) is designed. Based on the data structure compatible with the existing grid DEM, a semantic interpolation method is implemented, and the three-dimensional representation of S-DEM is realized by building a three-dimensional prototype system. Compared with the traditional method, the S-DEM model ensures the consistency of terrain region features and terrain attributes, and ensures the expression of terrain local features and vertical faces. The results show that terrain semantics is essentially the embodiment of terrain object features and depends on the object-oriented representation of terrain in data structure.
【作者单位】： 合肥工业大学宣城校区信息工程系;南京师范大学虚拟地理环境教育部重点实验室;
【基金】：国家自然科学基金项目(41401445、41371421) 安徽省自然科学基金项目(1508085QD76) 中央高校基本科研业务费专项资金项目(J2014HGBZ0198)
【分类号】：P208
[Abstract]:In the process of terrain modeling, the representation of the whole terrain feature is often lacking, which leads to the appearance of the distortion phenomenon that the terrain local feature in the current terrain model does not accord with the attribute of the terrain object. In this paper, the concept of terrain semantics is proposed to describe the local features of terrain, and the constraint of elevation in the region is realized through the formal expression of semantics. At the same time, the conceptual model of semantic DEM (S-DEM) is designed. Based on the data structure compatible with the existing grid DEM, a semantic interpolation method is implemented, and the three-dimensional representation of S-DEM is realized by building a three-dimensional prototype system. Compared with the traditional method, the S-DEM model ensures the consistency of terrain region features and terrain attributes, and ensures the expression of terrain local features and vertical faces. The results show that terrain semantics is essentially the embodiment of terrain object features and depends on the object-oriented representation of terrain in data structure.
【作者单位】： 合肥工业大学宣城校区信息工程系;南京师范大学虚拟地理环境教育部重点实验室;
【基金】：国家自然科学基金项目(41401445、41371421) 安徽省自然科学基金项目(1508085QD76) 中央高校基本科研业务费专项资金项目(J2014HGBZ0198)
【分类号】：P208
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