CAJ | 학술논문

针对应急灾情态势显示系统数据量庞大与数据更新迅速而造成模型数据量大、计算时间久的问题,提出了一种多分辨率三维地形建模方法.目的是使地形模型本身既满足视觉逼真度,又可以降低调用模型所耗的计算时间.为此,采用构建三维模型的分层递阶模型(hierarchical model,HM)的方法进行多分辨率建模.将用于遥感地物识别的基于尺度空间的层次聚类算法(scale-space based hierarchical clustering algorithm,SSHC)引入HM的构造过程,依据HM设置三维模型的各组节点,并与基于多边形优化的多细节层次(levels of detail,LOD)建模技术相结合构建大场景的三维地形模型.实验证明该方法可以实现符合视觉原理的由宏观到微观显示的同时降低地形模型的计算量,满足应急灾情态势显示的需要.
침대응급재정태세현시계통수거량방대여수거경신신속이조성모형수거량대、계산시간구적문제,제출료일충다분변솔삼유지형건모방법.목적시사지형모형본신기만족시각핍진도,우가이강저조용모형소모적계산시간.위차,채용구건삼유모형적분층체계모형(hierarchical model,HM)적방법진행다분변솔건모.장용우요감지물식별적기우척도공간적층차취류산법(scale-space based hierarchical clustering algorithm,SSHC)인입HM적구조과정,의거HM설치삼유모형적각조절점,병여기우다변형우화적다세절층차(levels of detail,LOD)건모기술상결합구건대장경적삼유지형모형.실험증명해방법가이실현부합시각원리적유굉관도미관현시적동시강저지형모형적계산량,만족응급재정태세현시적수요.
Aimed at emergency disaster situation display system (EDSDS),an approach to create 3D terrain models of multi-resolution with the purpose of rapid switching between different levels of information granules was presented.According to the characteristics and requirements of EDSDS,the multi-resolution approach was proposed to solve the time-consuming problem caused by transferring 3D terrain models into virtual scenes during switching different levels of information granules.Firstly,the hierarchical model (HM) is constructed through the scalespace based hierarchical clustering algorithm (SSHC) on the basis of remote sensing images.Secondly,accordance with the HM 3D terrain models were established following the OpenFlight data structure.Lastly,the 3D terrain models were optimized by levels of detail (LOD)techniques.Experimental results demonstrate that this proposed optimization algorithm accelerates the tempo of transferring 3D terrain models,especially the process from far and near.And this rapidity provides strong support for emergencies.