基于倾斜摄影技术的大比例尺测图研究

Research on Large Scale Mapping Based on Oblique Photography

传统测图一般采用外业实测和航测采集,存在人工成本高、效率低等问题。本文通过引入倾斜摄影技术,基于DP-Smart和DP-Modeler软件建立精确的三维模型,结合多视倾斜影像,构建多视角的三维矢量采集环境,形成严格成像关系下的精密测图。以山西太原某实验区为例,进行1∶500大比例尺地形图测图,并对精度进行了验证。结果表明,测图平面X方向中误差为0.031 m,Y方向测图中误差为0.035 m,小于平原地区1∶500大比例尺测图规范要求的0.25 m;高程中误差为0.046 m,小于规范中要求的0.2 m。综上,成果满足1∶500地形图测图要求,该方法能够提高测图作业的效能。

Traditional surveying and mapping are generally carried out by field survey and aerial survey.These methods have the problems of high labor cost and low efficiency.By introducing oblique photography.In this paper,an accurate 3D model is built on the basis of DP-Smart and DP-Modeler software by introducing oblique photography.Combined with multi view tilt images,a three-dimensional vector acquisition environment with multi view angles was constructed to form a precise mapping under the strict imaging relationship.Taking a experimentation area in Shanxi,Taiyuan,a large scale topographic map of 1∶500 was taken and the accuracy was verified.The results show that the median error in X direction is 0.031 m and Y direction is 0.035 m,which is less than 0.25 m required by the large scale 1∶500 surveying map in the plain area.And the error in elevation is 0.046 m,less than 0.2 m required in the standard.In summary,the results meet the requirements of 1∶500 topographic map mapping,and this method can improve the efficiency of mapping operations.