文档介绍：InSAR数据后处理研究—
缺失数据拟合
学院: 地质工程与测绘
专业:地理信息系统
姓名:XXX
学号:XXX
指导教师:XXX
完成时间:
摘要
我国的地面沉降现象一直比较严重。地面沉降破坏建筑物和生产设施、损坏地下线路设施等,给人们的生产、生活带来严重的影响。基于地面沉降对环境及经济建设破坏的严重性,当前许多地区及城市已将地面沉降监测作为防灾减害的一项重要工作。近年来大量的研究和实践表明, InSAR(合成孔径雷达干涉测量)技术可以高精度监测地表的微小地表形变,具有全天候、全天时、覆盖面广、高度自动化和高精度监测地表变形的优势,能够有效弥补水准测量和GPS测量空间分辨率不足的问题,是目前沉降灾害监测的一种重要技术手段。
然而,InSAR监测手段也有自己的不足,InSAR技术虽然具有很高的空间分辨率,但是雷达卫星因其固有的运行周期,无法满足监测的要求。另外,时间失相干或山区SAR影像的顶底倒置等易导致干涉图出现数据缺失,从而难以达到区域监测的目的。
本文针对数据缺失现象,研究基于多项式拟合和多面函数拟合的缺失数据拟合方法,重点探讨多面函数拟合中心节点以及核函数的选择问题,最后以西安市地面沉降监测数据为例,对比分析不同拟合模型的拟合效果,以此来探讨拟合模型的优选问题。
关键词:地面沉降,InSAR,D-InSAR,多项式拟合,多面函数拟合
ABSTRACT
Serious land subsidence phenomenon happen in china for a long time. Subsidence damage to buildings and production facilities, damage to underground line facilities to the people's production and life seriously affected. Based on land subsidence damage to the environment and the gravity of economic development, the current number of regions and cities have land subsidence monitoring harm reduction as an important prevention work. In recent years, extensive research and practice shows that, InSAR (Interferometric Synthetic Aperture Radar) technology to high-precision monitoring of the surface of the small surface deformation, all-weather, all-time, wide coverage, high degree of automation and high precision ground deformation monitoring of the advantages of effective to make up for leveling and GPS measurements the problem of inadequate spatial resolution, is the subsidence is an important side lesson plan techniques.
However, InSAR monitoring tools also have their own deficiencies, InSAR technology, while high spatial resolution, but the operation of the radar satellite because of its inherent cycle can not meet monitoring requirements. In addition, the time lost coherence or mountain top and bottom inverted SAR image of the interferogram so easily lead to data loss occurs, and thus difficult to achieve regional monitoring purposes.
In this paper, the phenomenon of m