机场建设的三维时态场景构建

3D Temporal Scene Building of Airport Construction

将三维时态可视化技术应用于机场建设过程,对地理要素进行三维时态展示,可以直观地模拟瞬时场景,帮助人们建立全局观念,对于管理建设进度具有重要意义。提出一种描述三维动态地理过程的3级层次表达模型,首先,构建描述地理要素变化特征的视觉变量组,设定时间粒度;然后,通过控制视觉变量组生成地理要素的动态模型;最后,根据地理要素在空间位置上的逻辑关系确定动态模型在时间轴上的叠加顺序,构建瞬时场景,将机场建设过程中地理要素随时间的变化过程展示出来。该方法建立的系统随时间的变化实现了建设过程三维动态展示与空间信息查询,提高了建设过程的管理及决策水平。

3 D temporal scene helps people to simulate the visual scene and establish a global view by describing the changes of geographic factors over time in the process of airport construction based on 3 D dynamic visualization technology, and it is significant for construction management. This paper presents a Hierarchical Model to describe 3 D dynamic geographic process. Firstly, combination of visual variables and time granularity are extracted to describe the change of cha-racteristics of geographic features. Then, 3 D dynamic models are generated by controlling the combination of visual variables. Finally, the order of 3 D dynamic models on the timeline is determined based on spatial relationship and lifecycle of geographic factors, and all dynamic models are integrated in the 3 D scene, the space-time relations between geographic factors in the process of airport construction are displayed. This method has been used to develop a 3 D dynamic visualization system of Lvliang airport, Shanxi province, which achieved 3 D dynamic displaying and spatial information query and is important for management and decision making during construction.