多基线数字近景摄影测量在建筑工程中的应用

The Application of Multi-baseline Digital Close Range Photogrammetry in Architectural Engineering

多基线数字近景摄影测量与传统近景摄影测量相比,具有短基线、大重叠度的特点,短基线使得相邻光束交会角较小,易于提高影像匹配精度;大重叠度使得首尾交会角较大,从而可提高空间点定位精度。该方法有效地解决了影像匹配、交会角和点定位精度三者之间存在的矛盾。首先,利用非量测数码相机进行多基线平行摄影,借助Lensphoto软件实现建筑物立面点坐标的量测,并将其与高精度莱卡全站仪测量结果进行精度对比,最后分析控制点个数与点位精度之间的关系。实验表明,多基线近景摄影测量在建筑工程测量中可以取得较高的点位精度,控制点个数的增加会提高点位精度,但存在一定极限。

Compared to traditional close range photogrammetry, multi - baseline digital close range photogrammetry has the character- istics of short baseline and large overlap. Short baseline can improve the accuracy of image matching based on the small adjacent inter- section angle. The large overlap can also improve the point accuracy because of the large whole intersection angle. Therefore, the con- tradictions among the image matching, intersection angle and points precision can be solved effectively. Firstly, in this paper images of building are obtained in multi - baseline parallel photography form with non metric digital camera. Then the images are processed by Lensphoto software in order to extract the point coordinates of building facade. Finally, the results are compared to the measurements of high precision Leica total station and the relationship between the number of control point and the point precision is analyzed. The experimental results show that multi - baseline digital close range photogrammetry can acquire the point measurements with high accu- racy in architectural engineering field and the larger number of control points can improve the positional accuracy, but there is a cer- tain limit.