摘要
针对现有城市可视域分析方法大多基于建筑物简化模型实现,忽视城市细节要素导致分析结果偏差的问题,为此综合考虑复杂场景全要素提出基于三维草图-对象匹配模型。首先研究运用层次匹配三维对象提取方法,计算视域包含待分析对象,贴合应用场景;然后基于视线实现三维对象顶点映射,通过对象匹配实现可视域分析。以监控摄像头选址为应用实例,试验结果表明,本方法是一种快速、稳健的可视域分析方法,能够较充分地考虑复杂城市三维场景中的全要素,具有精细模拟监控摄像头监控效果的特点,通过视域的动态调整,能够实时展示不同监控效果,可为城市智慧化管理提供科学辅助决策。
Most of the current urban viewshed analysis methods are performed with the application of simplified building models, in which detailed city elements are ignored, thus the deviations between analysis results and reality are resulted in. A 3 D sketch-object matching model based on comprehensive consideration of all elements in a complex scene was proposed. Firstly, to speed up the execution and fit the real scene, a 3 D object extraction method called hierarchical matching was adopted to calculate the objects contained in the viewshed. Then, mapping the vertices of the 3 D object was performed based on the line of sight created by the 3 D sketch and the observation point. At last, the viewshed analysis was provided by object matching. In this paper, taking the location of surveillance cameras as case study, the experimental results indicate that the proposed method is fast and robust, which can fully consider all the elements in a complex city 3 D scene, and has the effect of finely simulating surveillance camera monitoring. Through the dynamic adjustment of the viewshed, different monitoring effects can be displayed in real time, which can assist in scientific auxiliary decision support for the management of smart city.
作者
孙亚琴
张林
徐强国
靳文举
詹秀眉
SUN Ya-qin;ZHANG Lin;XU Qiang-guo;JIN Wen-ju;ZHAN Xiu-mei(Key Lab of Land Environment and Disaster Monitoring,Ministry of Natural Resources,Xuzhou Jiangsu 221116,China;School of Environment and Spatial Informatics,China University of Mining and Technology,Xuzhou Jiangsu 221116,China;Zhaolou Coal Mine,Yanmei Heze Energy and Chemical Company Ltd.,Heze Shandong 274705,China)
出处
《现代测绘》
2021年第2期5-9,共5页
Modern Surveying and Mapping
基金
国家重点研发计划(2017YFE0119600)
作者简介
第一作者:孙亚琴,博士,副教授,研究方向为地理信息与智慧城市。
