随着数字摄影测量技术从单机工作方式向系统集成的工作方式转变，处理空间数据获得数字正射影像（DOM）已较为容易。但传统大比例尺城市DOM中存在建筑物倾斜、变形等问题，很难直接利用DOM进行精确测图。本文为解决传统DOM量测问题，提出可量测的影像高程同步模型（OESM），利用数字高程模型（DEM）和数字表面模型（DSM）获取DOM每个单元的高程信息，以还原真实三维场景。在OESM模型的基础上，DOM不仅可以实现“单片”精确测图功能，还可利用高程信息直接应用于大比例尺城市测图中的建筑物重建，避免传统摄影测量立体测图引起的繁复操作，提高人力测图效率。文中利用真实航空影像和点云数据（25 pts/m2）进行了建筑物屋顶角点的OESM单片量测，试验结果表明利用OESM模型测图精度可靠。%The work mode of digital photogrammetry technology is shifting from standalone to system integration ,making it easy to process the spatial data and obtain the digital orthophoto map (DOM) product .In large-scale mapping ,buildings titling and deforming problem exists in the DOM of urban area . It is difficult to deal with these distorted details in the practical photogrammetric mapping operation .A new elevation model defined as orthoimage elevation synchronous model (OESM) is proposed to obtain the true elevation of every pixel in an orthoim-age derived from digital elevation model (DEM) and digital surface model (DSM) ,retrieving the real world scene .The OESM makes it possible to directly collect the 3D information of non-ground objects without the tedious stereo plotting .Based on real images and point clouds (25 pts · m-2 ) ,validation experiments by corner points monolithic measurement with good mapping effi-ciency ,demonstrate a high OESM’s modeling and 3D mapping accuracy .
展开▼
