项目名称: 融合稳定点目标和分布式目标的时间序列InSAR监测大区域地面沉降研究
项目编号: No.41304010
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 天文学、地球科学
项目作者: 吴宏安
作者单位: 中国测绘科学研究院
项目金额: 25万元
中文摘要: 本项目针对大区域地面沉降监测应用需求,在多主影像小基线时间序列InSAR技术框架下,联合SAR的幅度、相干系数和干涉相位多属性特征,开展面向城区的稳定点目标精确提取研究;开展面向非城区的分布式目标精确提取研究;开展模型相干系数阈值最优化选择研究,选择合适的阈值利用Delaunay三角网最大程度连接监测目标;开展多层级的相邻子网连接研究,使不连续Delaunay子网能够快速、稳健相连,实现大区域地面沉降反演;最后利用水准或GPS等地面数据验证InSAR沉降反演结果,并对算法的应用潜力进行评价分析。
中文关键词: SAR干涉测量;点目标;分布式目标;不连通子网;大区域
英文摘要: Aiming at the needs for monitoring ground subsidence over large areas, this project proposes a novel methodology based on small baseline time series InSAR technique to retrieve the subsidence not only in urban areas but also in non-urban areas. The methodology includes: 1) precise selection of stable point targets in urban areas using amplitude, coherence and differential phase information; 2) precise selection of distributed targets in non-urban areas using coherence and differential phase information; 3) threshold optimization of Ensemble Phase Coherence to connect targets as many as possible by Delaunay triangulation; 4) fast and robust connection for discontiguous sub network in multiple ranges; 5) validation for ground subsidence retrieved by time series InSAR using leveling or GPS measurement data, and evaluation the potential applications of this methodology.
英文关键词: SAR interferometry;point targets;distributed targets;discontinuous subnetwork;large area