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Improving the Arctic Gravity Project grid and making a gravity anomaly map for the State of Alaska
GFF ( IF 1 ) Pub Date : 2019-09-25 , DOI: 10.1080/11035897.2019.1633396
Bernard Coakley 1 , Jeffery Johnson 2 , James Beale 3 , Rose Ganley 3 , Monica Youngman 4
Affiliation  

ABSTRACT Incremental improvements to the Arctic Gravity Project (AGP) grid have accumulated through the steady acquisition of marine gravity anomaly data in the Arctic Ocean and other data sets. The explosion of data collected to establish the Extended Continental Shelves of the Arctic coastal states has increased the available data in and around the Arctic Ocean. A consistent issue with the AGP grid has been a very irregular distribution of gravity anomaly data in Alaska. While parts of the state have been well-surveyed (e.g. the North Slope) much of this remote region has not. Access is difficult. Control points for gravity ties are non-existent. As a result, the anomalous field for Alaska has not been well determined. This may be changing due to the extensive airborne survey conducted by the US National Geodetic Survey. Nearly all of continental Alaska has been flown at ~6 km elevation with a 10 km line spacing as a part of the GRAV-D project. These data have been collected by a single group, using consistent procedures and the same equipment. These data form an ideal basis for a new gravity anomaly map for the State of Alaska. Using the new data, collected from ships and the airborne data collected through the GRAV-D project in conjunction with satellite and land data will substantially improve knowledge of the gravity field. All of the new data will be included in the updated AGP grid, which should be available in a year, updating the last release from 2008.

中文翻译:

改进北极重力项目网格并为阿拉斯加州制作重力异常图

摘要 通过稳定获取北冰洋海洋重力异常数据和其他数据集,北极重力项目(AGP)网格得到了逐步改进。为建立北极沿海国家的扩展大陆架而收集的数据激增,增加了北冰洋及其周边地区的可用数据。AGP 网格的一个一致问题是阿拉斯加重力异常数据的分布非常不规则。虽然该州的部分地区(例如北坡)已经过充分调查,但这个偏远地区的大部分地区还没有。访问很困难。重力关系的控制点不存在。因此,阿拉斯加的异常场尚未确定。由于美国国家大地测量局进行了广泛的空中调查,这种情况可能会发生变化。作为 GRAV-D 项目的一部分,几乎所有的阿拉斯加大陆都以约 6 公里的海拔高度飞行,线间距为 10 公里。这些数据由一个小组收集,使用一致的程序和相同的设备。这些数据构成了阿拉斯加州新重力异常图的理想基础。使用从船上收集的新数据和通过 GRAV-D 项目收集的机载数据,结合卫星和陆地数据,将大大提高对重力场的了解。所有新数据都将包含在更新的 AGP 网格中,该网格应该在一年内可用,更新 2008 年的最新版本。这些数据构成了阿拉斯加州新重力异常图的理想基础。使用从船上收集的新数据和通过 GRAV-D 项目收集的机载数据,结合卫星和陆地数据,将大大提高对重力场的了解。所有新数据都将包含在更新的 AGP 网格中,该网格应该在一年后可用,更新 2008 年的最新版本。这些数据构成了阿拉斯加州新重力异常图的理想基础。使用从船上收集的新数据和通过 GRAV-D 项目收集的机载数据,结合卫星和陆地数据,将大大提高对重力场的了解。所有新数据都将包含在更新的 AGP 网格中,该网格应该在一年后可用,更新 2008 年的最新版本。
更新日期:2019-09-25
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