城市街景动态环视旷奥度评价

街景动态环视旷奥度可为城市街道空间规划设计提供必要的评价依据。以改善城市街道空间感受为目的,研究城市街景视觉环境特征,从街景动态环视感受及反应的途径入手,通过将街景主观感受与街景客观组成相结合的方法,提取并建立城市街景旷奥度的评价标准和评价指标。以上海虹桥商务区为例,通过动态观看全景照片模拟动态环视感应,借助计算机视觉算法、空间模拟等技术和语义分析法收集指标数据并对其进行统计分析,确立街景旷奥主观感受与客观组成之间的量化感应关系,进而对研究区域内的视觉环境开展定量评价,结果显示研究区域内的街景旷奥度分布呈现明显的空间差异。以客观评价指标为判断,提出基于景观视觉评价的街景优化导向,可为城市街道空间规划设计提供参考。

Evaluation of Kuang-ao Degree in Dynamic Circular Viewing of Urban Streetscape

Kuang-ao degree in dynamic circular viewing of streetscape can provide a necessary evaluation basis for spatial planning and design of urban streets. To improve the spatial feeling of urban streets, this research studies the characteristics of the visual environment of urban streetscape and, starting from the feeling of and response to the dynamic circular viewing of streetscape, extracts and establishes the evaluation criteria and indicators for Kuang-ao degree of urban streetscape based on the combination of subjective feeling and objective composition of streetscape. Taking Shanghai Hongqiao Business District as an example, this research simulates the sensing of dynamic circular viewing through dynamic viewing of panoramic photos and, with the help of computer vision algorithm, spatial simulation technology and semantic analysis method, collects and statistically analyzes indicator data to establish the quantitative sensing relationship between the subjective feeling and objective composition of streetscape, based on which carry out quantitative evaluation on the visual environment in the research area, and the results show that the distribution of Kuang-ao degree in the study area shows noticeable spatial differences. Finally, taking objective evaluation indicators as judgment basis, the research puts forward guidance for optimization of streetscape based on landscape visual evaluation, which can provide reference for spatial planning and design of urban streets.