Fast level-set methods for large-scale geospatial-information based inverse gravimetry problems and applications to threats detection

这位首席研究员和他的同事们将为大规模基于地理空间信息的反重力测量问题开发快速水平集方法，并将这些工具应用于威胁检测。它们旨在从理论和计算的角度解决地理空间智能应用和遥感产生的一些具有挑战性的反问题：引力势的快速稳定数值延拓和地下吸引源包裹体的快速高分辨率重建。首先，他们提出的重力场数值延拓的快速算法将克服重力反问题中长期存在的重大困难，因为新方法可以应用于任意计算区域中任何维度的重力场和磁势。其次，他们提出的用于大规模基于地理空间信息的反重力测量问题的快速水平集方法将是第一个能够从基于地理空间信息的重力测量中恢复区域及其潜在密度的同类方法。第三，新的快速方法将在基于流架构的高性能计算平台上开发成高效的算法和代码。第四，所产生的代码将在合成数据集和GRACE卫星数据集上进行测试。因此，这套新的强大的计算工具将首次被开发用于大规模基于地理空间信息的重力反问题。该项目将解决地球空间科学、遥感、地球科学和科学计算方面的一些基本问题。多年来，美国政府一直在通过部署先进的雷达和卫星收集地理空间信息来开发遥感技术。解决重力反问题是对采集到的监测数据进行分析和分类的重要任务之一。这项研究工作将使国防和国土安全部门在探测地下隧道和洞穴(包括人造地下结构)的快速高效算法方面取得进一步的进展和突破。这是这项工作所涉及的一个例子。这样的地下隧道可以存在于美国边境。问题是要确定这种地下隧道的存在和位置。本文所做的研究与分析威胁检测中所有此类应用程序收集的地理空间信息相关。来自国际和平研究所的学生参与了这个创新的跨学科研究项目。

The principal investigator and his colleagues will develop fast level-set methods for large-scale geospatial-information based inverse gravimetry problems and apply these tools for threats detection. They aim at addressing some challenging inverse problems arising from geospatial-intelligence applications and remote sensing from both theoretical and computational perspectives: fast stable numerical continuation of gravitational potentials and fast high-resolution reconstruction of subsurface attracting-source inclusions. First, their proposed fast algorithms for numerical continuation of gravity fields will overcome significant, long-standing difficulties in inverse gravimetry problems because the new methods can be applied to gravitational and magnetic potentials in arbitrary computational domain in any dimension. Second, their proposed fast level-set methods for large-scale geospatial-information based inverse gravimetry problems will be the first of its kind which is able to recover both a domain and its potential density from geospatial-information based gravitational measurements. Third, the new fast method will be developed into efficient algorithms and codes on streaming-architecture based high performance computing platforms. Fourth, the resulting codes will be tested on synthetic data sets and GRACE satellite data sets. Consequently, this new set of powerful computational tools will be developed for the first time for large-scale geospatial-information based inverse gravimetry problems. The project will address some fundamental issues in geospatial sciences, remote sensing, geosciences and scientific computing. The US government has been developing remote sensing technology by deploying advanced radars and satellites to collect geospatial information for many years. Solving the inverse gravimetry problem is one of the many essential tasks to analyze and classify the collected surveillance data. This research endeavor will enable further advances and breakthroughs in the Defense and Homeland Security sector in the form of fast and efficient algorithms for the detection of underground tunnels and caves, including man-made underground structures. This is an example of what this work concerns. Such underground tunnels can exist along the US border. The problem is to determine the existence and location of such underground tunnels. The research done here is relevant to analyzing geospatial information collected by all such applications in threats detection. Students from the PI's institution are involved in this innovative interdisciplinary research project.