Greenland Surface Velocities and Flow Features From High Resolution Visible Statellite Imagery

[摘要]首席研究员将利用1963年至1968年的高分辨率（34 m像素）解密情报卫星照片（DISP）获得格陵兰东部出口冰川的表面速度。速度和可见的地表特征将为探测冰盖变化提供早期基线。对于选定的冰川，结果将用于描述流动模式，并在数据允许的情况下使用力预算法确定主要应力。DISP图像仅以胶片形式提供，每张胶片的标称面积为10.6 X 144.8海里。他们将收集近600部电影，评估它们的质量和对冰川学的兴趣，扫描并数字化选定的电影。那些适合的图像，如云少、辐射分辨率高的图像，将用于自动裂缝跟踪以获得速度。所有影片都将存档，并附有简短的描述。从DISP得到的速度将与合成孔径雷达（SAR）干涉得到的速度进行比较。如果有很大的差异，首席研究员将与SAR科学家一起确定差异。

AbstractVanderVeenOPP-9911981The Principal Investigator will obtain surface velocities of outlet glaciers in eastern Greenland by using high-resolution (34 m pixel size) declassified intelligence satellite photographs (DISP) from 1963 to 1968. The velocities and visible surface features will provide an early baseline for detection of ice-sheet changes. For selected glaciers, the results will be used to describe the pattern of flow and to determine the dominat stress using the force-budget method where the data permit. The DISP images are only available on film, with each film covering a nominal area of 10.6 X 144.8 nautical miles. They will acquire nearly 600 films and assess their quality and glaciological interest, scan and digtize selected films. Those images that are suitable such as those with few clouds and high radiometric resolution will be used for automated frature tracking to obtain velocities. All films will be archived with a short description of each. Velocities obtained from the DISP will be compared with those derived from Synthetic Aperture Radar (SAR) interferomery. If there are large differences, the Principal Investigator will work with SAR scientists to identify the discrepancies.