Photogrammetric Techniques for the Determination of Spatio-temporal Velocity Fields at Glaciar San Rafael, Chile
Photogrammetric Techniques for the Determination of Spatio-temporal Velocity Fields at Glaciar San Rafael, Chile
复制标题
用于确定智利圣拉斐尔冰川时空速度场的摄影测量技术
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
A. Wendt
中科院分区：
文献类型：
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作者：
H. Maas;G. Casassa;D. Schneider;E. Schwalbe;A. Wendt
位于北方巴塔哥尼亚冰原的圣拉斐尔冰川，长46公里，冰面积722平方公里，是世界上纬度最低的冰川，也是南美洲南部冰山流量最快、最多产的冰川之一。时空速度场的冰川锋的区域确定从monoscopic地面图像序列记录的间隔vallometer模式的高分辨率数码相机在几天内。在这些图像序列中，大量的冰川表面点跟踪亚像素精度的特征跟踪技术。使用多站GPS支持的摄影测量网络对从图像空间跟踪获得的轨迹进行缩放和地理参考。该技术允许跟踪数百个冰川表面点，测量精度为1分米，典型的冰川运动速率，以及几乎任意高的时间分辨率。结果显示，速度高达每天16米。
Glaciar San Rafael in the Northern Patagonia Icefield, with a length of 46 km and an ice area of 722 km2, is the lowest latitude tidewater outlet glacier in the world and one of the fastest and most productive glaciers in southern South America in terms of iceberg flux. Spatio-temporal velocity fields in the region of the glacier front were determined from monoscopic terrestrial image sequences recorded by an inter-vallometer mode high-resolution digital camera over several days. In these image sequences, a large number of glacier surface points were tracked by subpixel accuracy feature tracking techniques. Scaling and georeferencing of the trajectories obtained from image space tracking was performed using a multi-station GPS-supported photogrammetric network. The technique allows for tracking hundreds of glacier surface points at a measurement accuracy in the order of one decimeter, for typical glacier movement rates, and an almost arbitrarily high temporal resolution. The results show velocities of up to 16 meters per day.
影响因子：
3.9
作者：
Rasmussen, L. A.;Conway, H.;Raymond, C. F.
通讯作者：
Raymond, C. F.