地形TIN中地理实体表达与LOD技术  

A representation and LOD technology for geographic objects in terrain TIN

作　　者：王殷行[1] 

机构地区：[1]山东理工大学建筑工程学院,山东淄博255049

出　　处：《测绘科学》2009年第4期53-54,26,共3页Science of Surveying and Mapping

基　　金：国家自然基金"GIS多源集成空间数据间不一致性的智能化处理理论与方法"(编号40501053)

摘　　要：现有的LOD技术确保了3维地表的实时绘制,但其不能解决以地理实体为结构进行组织、具有实体表达能力的高精度、大规模地形TIN的3维可视化实时响应问题,仍经常发生场景滞涩、跳跃等现象。为此,本文从面向对象的角度出发,对地形TIN按实体进行组织,建立了OTIN,设计出实体包围球、高程误差队列等结构,可以确保以实体为单位的大规模地形TIN的实时绘制。Existing level of detail technologies offer a good support for 3 D real-time rendering, but it can＇ t accomplish real-time responding of 3D visualization in extensive terrain TIN that is constructed with geographic objects. Scene block and view discontinuousness often appear. According to the object orientation-based view, this paper constructs geographic objects, designs the enclosing ball, and devises the error queue of geographic objects in object triangulated Irregular network. Those methods can assure the real-time rendering of 3D visualization in large scale TIN that is constructed in entities.

关 键 词：层次细节技术 地理实体 对象化不规则三角网 三维可视化 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]