地面多基线数字摄影测量在冰川测量中的应用 ——以博格达峰黑沟8号冰川为例

冰川的监测一直是冰川学研究的重要内容, 2008年对天山东段博格达峰南坡的黑沟8号冰川末端进行了地面多基线数字摄影测量, 获取了该冰川末端的影像, 以及与之相配套的控制信息. 在Lensphoto多基线数字摄影测量系统中, 测得了冰川末端的0.11 km² DEM数据. 采用同期测量的GPS数据检验得知, 摄影测量所得DEM数据在高程上的平均误差为1.92 m, 标准偏差为3.47 m. 地面旋转多基线数字摄影测量是一种非常有效的冰川测量手段, 可以在典型冰川测量和冰川重要部位(例如冰川末端、 冰崖等)的测量中发挥作用.

Ground Multi-Baseline Digital Photogrammetry for Surveying the Heigou Glacier No.8 in the Mt. Bogda, Tianshan Mountains

Ground photogrammetry is a traditional and important glacier surveying method. Because of satellite remote sensing technology arising, glacier ground photogrammetry was immersed in trough for a time. However, with the increase in demand of high precision topographic data and the digital photogrammetry technology evolving, ground photogrammetry again becomes an effective means of glacier surveying. In August 2008, a ground multi-baseline photogramdmetry test was carried out on the terminus of Heigou Glacier No.8 in the south slopes of the Mt. Bogda, eastern Tianshan Mountains. Using dozens of images obtained from four camera stations and the corresponding ground control information, by the assistant of Lensphoto digital photogrammetric system and non-metric digital camera, a DEM was constructed with an area of 0.11 km² and 1 m?1 m resolution. RTK-GPS measurements were used to assess the accuracy of the photogrammetry DEM; The DEM shows an average error of 1.92 m and a standard deviation of 3.47 m. The precision is sufficient for most glaciological studies; it's a beneficial try to make a high resolution digital elevation model within a limited area in China.