基于无人机航拍照片的西安城市形象感知研究

City image perception of Xi’an based on unmanned aerial vehicle photography photos

随着消费级无人机技术的快速发展,无人机航拍摄影资料成为城市形象感知研究的重要数据来源。论文基于社交平台"天空之城"获取的西安市无人机航拍照片、简介文本和拍摄地位置等信息,综合运用计算机视觉图片分析、计算机文本情感分析、社会网络分析和GIS空间分析等方法,探究无人机视角下的西安城市形象。研究发现:(1)无人机航拍照片主要集中在主城区,周边郊县较为疏散,呈现"内密外疏"的空间格局,其核密度最高值区位于三区交界的城市中心地带,为南北向的"哑铃型"布局;(2)视觉形象侧重对现代城市景观的描述,以人文景观类照片为最;(3)情感评价整体趋于积极正向,在主城区热门景点两极分化明显。最后,探索了无人机视角下城市形象建构与提升的综合机制,并对西安城市形象建设和无人机使用政策提出优化建议。

With the rapid development of civilian unmanned aerial vehicle(UAV)technology,UAV aerial photography has become an important data source for urban image perception research.Based on the photos,text introduction,shooting location,and related data of UAVs photos of Xi’an City obtained from the social media platform SkyPixel,this study used computer vision analysis,computer text emotion analysis,social network analysis,and GIS spatial analysis to explore the city image of Xi’an from the perspective of UAV.The research results show that:1)UAV aerial photography photos are mainly concentrated in the main urban areas,and there are fewer aerial data points in the suburb.The spatial distribution of photos presents a pattern of dense inside and sparse outside,with the highest density area in the center of the city at the junction zone of the three districts,showing a dumbbell-type distribution extending from the north to south.2)The visual images are mostly of modern urban landscape description,of which the content of human landscape is dominant.3)Emotion evaluation presents an overall positive feeling,and the polarization of the popular tourist attractions is obvious in the main urban area.Finally,this study explored the mechanism of city image formation and promotion from the perspective of UAV,and provided recommendations for the optimization of Xi’an city image construction and UAV use policy.