Generation of digital elevation model in remote locations using satellite SAR interferometry and the model evaluation

利用卫星SAR干涉测量法生成偏远地区数字高程模型并进行模型评估

基本信息

批准号：
09640512
负责人：
AOKI Shigeru
金额：
$ 1.54万
依托单位：
National Institute of Polar Research
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 2000
项目状态：
已结题

项目摘要

The primary goal of this study is to generate a digital elevation model (DEM) using satellite SAR interferometry for remote regions where ground observations are difficult, and is to evaluate them with independent methods.A DEM of the ice sheets around Lutzow-Holm Bay, where the Japanese wintering station is located, was generated with the satellite SAR three-pass method. Comparisons with the state-of-the-art global DEM showed improvement in its accuracy up to an order, using ground observations including GPS results as references. On the other hand, a few problems in the generation process were clearly identified.To derive a groundling line precisely, which forms the boundary between grounded ice sheet and floating ice shelf, the SAR interferometry was applied to Baudouin Ice Shelf to the west of Lutzow-Holm Bay. The grounding line was clearly identified and tracked from the spatial difference in fringes. The derived vertical displacement was consistent with the one which was inferred from a ocean tide model with inverse barometer effect.To establish and evaluate the methods of ground observations for the rapidly moving objects, GPS observations were conducted between the points on fast sea ice and on ground rocks. Simultaneous observations confirmed that the GPS can detect the vertical displacement of sea ice in an accuracy of 1-2 cm.As above, this study established the availability of the SAR interferometry to DEM generation for remote locations. Combined application with the effective GPS ground observations will enable much precise monitoring of the whole ice-covered area.

这项研究的主要目的是使用卫星SAR干涉测量法生成数字高程模型（DEM），以对地面观测很难进行远程区域，并以独立的方法进行评估。与最先进的全球DEM的比较显示了其准确性提高到订单，使用（包括GPS结果）作为参考。另一方面，清楚地发现了生成过程中的一些问题。精确地得出一条地面线，该线形成了地面冰盖和浮冰架之间的边界，将SAR干涉法应用于Lutzow-Holm Bay西部的Baudouin Ice Bhelf。从边缘的空间差异中清楚地识别了接地线并跟踪。衍生的垂直位移与从具有反晴雨表效应的海潮模型推断出的垂直位移是一致的。为了建立和评估快速移动物体的地面观测方法，在快速海冰和地面岩石上的点之间进行了GPS观测。同时观察结果证实，GP可以以1-2厘米的精度检测海冰的垂直位移，因此，这项研究确定了SAR干涉仪可用于远程位置的DEM生成。与有效的GPS地面观测相结合的应用将对整个冰覆盖的区域进行大量精确的监测。