摘要
三维地形是飞行模拟视景系统中的一项重要研究内容,研究三维地形的数据结构、模型表示方法及大场景的可视化显示和动态修改的技术意义重大。文中介绍了DEM数据模型的规则网格模型、等高线模型、不规则三角形网模型,利用O penGL实现了三维数字地形的算法模拟和真实DEM数据模型的可视化显示。在地形绘制和显示的基础之上,从地形的单点、多点修改出发对三维数字地形动态修改做了研究,并给出了地形区域修改的方法。
Aim. To our best knowledge, there is no paper in the open literature concerning the dynamic revision of the display of 3D terrain. We now present our research results on revision. In the full paper, we explain in detail how to implement the dynamic revision of the display of 3D terrain; in this abstract, we just add some pertinent remarks to listing the three topics of explanation： （1）the DEM （Digital Elevation Model） of data; （2）terrain painting; （3）dynamic revision; the subtopics of topic 1 are the rule network model （subtopic 1. 1）, the contour model （subtopic 1.2） and the triangulated irregular network model（subtopic 1.3）; the subtopics of topic 2 are the display of simulated terrain（subtopic 2.1） and the actual terrain（subtopic 2.2） ; under subtopic 2.1, Fig. 3 in the full paper shows the flowchart of the steps of terrain painting with OpenGL algorithm; the subtopics of topic 3 are the single point revision and the multi-point revision （subtopic 3.1） and the area revision of 3D digital terrain （subtopic 3.2）. Finally we give two numerical examples： trench digging and riverbed digging. The trench and riverbed digging results are dynamically revised as shown respectively in Figs. 9 and 10 in the full paper. They show preliminarily that our dynamic revision method for 3D terrain in flight simulation is feasible and effective.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2006年第6期721-725,共5页
Journal of Northwestern Polytechnical University
基金
航空科学基金(03D53027)资助
