基于无人机摄影测量的建筑违章信息采集研究
2021-08-09陈万卫
陈万卫



摘 要:传统违章建筑信息采集,主要通過执法人员实地巡逻勘察和群众举报发现,时效性差。该文提出采用现代遥感影像和三维模型数据对违章建筑探索提高效率,缩短时间减少人工投入,提供违章建筑信息及证据,为消除台账做准备。高清遥感影像空间分辨率高,能满足基础测绘的精度要求、地面建设用地易辨识,通过两期遥感影像数据对比,直观看出建设用地变化,筛选出违章建筑,计算违章建筑面积。结果表明,无人机获取倾斜模型在取证阶段,对遮挡少的违章建筑取证效果好,并提高了数据准确度。
关键词:无人机 倾斜摄影测量 违章建筑 数据库
中图分类号:P258 文献标识码:A文章编号:1672-3791(2021)04(b)-0095-03
Research on Construction Violation Information Collection Based on UAV Photogrammetry
CHEN Wanwei
(Guangdong Institute of Land and Resources Surveying and Mapping, Guangzhou, Guangdong Province, 510300 China)
Abstract: Traditional illegal building information collection, mainly through the law enforcement personnel on-the-spot patrol investigation and the masses report, is not timely. This paper proposes to use modern remote sensing image and 3D model data to explore illegal buildings, improve efficiency, shorten time, reduce labor input, provide information and evidence of illegal buildings, and prepare for the elimination of accounts. The high-definition remote sensing image has high spatial resolution, which can meet the accuracy requirements of basic surveying and mapping, and the ground construction land is easy to identify. Through the comparison of two phases of remote sensing image data, the change of construction land can be seen directly, the illegal buildings can be screened out, and the illegal building area can be calculated. The results show that in the forensics stage, UAV acquisition tilt model has good forensics effect on the illegal buildings with less occlusion, and improves the data accuracy.
Key Words: UAV; Tilt photogrammetry; Illegal building; Database
无人机航测能够高效快速获取高分辨率航空影像及倾斜摄影测量数据。由于其具有反应灵敏、高效率、定位准确、拍照清晰、作业成本低、运用范围广的特点,可在违章建筑探测外业调查取证中发挥重要作用[1]。
违章建筑探测是内、外业一体的测量调查工作,测绘内业与外业需紧密配合,包括资料收集、权利人调查、土地规划、建筑物拆除反馈销账等内容,将实景三维技术应用于违章建筑探测中,能够解决项目问题,已成为测绘行业应用的发展趋势和主流。
倾斜摄影涉及的关键技术主要包括影像预处理、多视影像联合平差、多视影像密集匹配、数字表面模型生成和真正射影像纠正等。
1 获取违章建筑流程
无人机倾斜三维模型参与违章建筑的获取方法分为相关资料收集、建筑判别和生成违章建筑数据库处理3个步骤,具体如图1所示。……
