城市级实景三维模型构建及精度分析
Construction and Accuracy Analysis of Real-Time 3D Model of City-Level

本研究采用无人机倾斜摄影测量技术，以镇江市中心建成区和南山风景区为试验区，结合Context Capture软件，对无人机获取的多架次影像数据进行分析和处理，构建了城市级实景三维模型，并对模型场景做了多粒度融合及匀光匀色处理研究，基于外业实测的特征点位，内业在模型成果中量取对应同名点的平面和高程值，分别计算统计检测点的平面精度和高程精度。经计算统计，模型的平面位置中误差为：±0.090米；高程中误差：±0.108米，符合精度要求。结果表明，无人机倾斜摄影测量技术在城市级实景三维模型建设中具有可行性，精度可靠，能够为政府制定城市整体发展战略、城市安全运行管理等全局性宏观决策提供全空间地理信息服务。
In this study, the UAV oblique photogrammetry technology is used, and the built-up area of Zhenjiang City Center and Nanshan Scenic Area are used as experimental areas, combined with Context Capture software, to analyze and process the image data of multiple flights obtained by UAV, and construct a the city-level real scene 3D model is based on the characteristic points measured by the field. In addition, the multi-granularity fusion and uniform light and color processing research were carried out on the model scene and the internal industry measures the plane and elevation values corresponding to the points with the same name in the model results, and calculates the plane ac-curacy and elevation accuracy of the statistical detection points respectively. After calculation and statistics, the error in the plane position of the model is ±0.090 meters, the error in the elevation is ±0.108 meters, which meets the accuracy requirements. The results show that the UAV oblique photogrammetry technology is feasible and accurate in the construction of city-level real 3D models, and can provide full-spatial geographic information services for the government to formulate over-all urban development strategies, urban safety operation management and other overall macro decisions.