共查询到18条相似文献,搜索用时 156 毫秒
1.
2.
本文针对2010年4月14日玉树地震引起的地表形变,使用日本ALOS卫星PALSAR L波段雷达影像数据,应用两轨雷达差分干涉(DInSAR)处理得到了以玉树为中心11 000km2范围内的同震形变场,空间分辨率为8m,并在此基础上对玉树地震的震源机制和发震机理进行了分析。研究结果表明L波段雷达数据适合在地形起伏较大的地区进行DInSAR形变探测。该同震形变场信息可为玉树地震的同震形变反演提供参考数据。该研究进一步证实DInSAR技术在大规模地表形变探测和地学研究领域具有广阔的应用前景。 相似文献
3.
4.
《测绘文摘》2006,(3)
CH20061433DInSAR技术对不同方位形变的敏感性研究=The Sensitivity of DInSAR to Surface Deformationin Different Direction/查显杰,傅容珊,戴志阳(中国科学技术大学地球与空间科学学院)∥测绘学报.-2006,35(2).-133~137以DEM数据为假想的地面目标,只考虑距离对相位的影响,模拟竖直向、距离向和方位向形变的干涉纹图,从而研究DInSAR技术对空间不同方位形变的敏感性。在所有模拟参数和形变位移大小都相同的情况下,3个不同方位形变所产生的相位从0~2π变化的完整干涉环的数目是各不相同的,揭示DInSAR技术对不同方位地表形变的… 相似文献
5.
针对单一平台DInSAR技术仅能获取雷达视线方向同震形变场的问题,根据雷达成像的几何条件,融合不同轨道、不同平台的DInSAR数据解算了拉奎拉地震的三维同震形变场。三维形变结果反映的拉奎拉地震发震断层的特征与地质调查的结果较吻合。将得到的三维形变场数据与该地区GPS观测站数据进行比较,结果表明,得到的拉奎拉地震的三维同震形变场比较可靠且精度较高。 相似文献
6.
《测绘与空间地理信息》2020,(6)
我国城市快速发展,人口急剧增加,地下水超量抽汲,需要以新思路、新方法进行城市大地形变测量,实践证实DInSAR+倾斜摄影技术更具优势。应用DInSAR及改进的沉降监测技术取得H市两个时间段地面形变监测成果后,经精密水准测量检验,证实结果可靠。倾斜摄影技术不断进步,经大量实践,已成为城市形变监测的又一选择。应用DInSAR+倾斜摄影进行城市形变监测,打破了传统形变测量的手段和理念,实现了与基础成果的全景比对或相同点位真三维对比,还可对城市的点、面、体,局部或全方位进行形变监测,监测成果可互为验证,且效率高、精度高、成本低,本文采用该方法实现了试点区的监测工作。 相似文献
7.
8.
合成孔径雷达差分干涉测量技术是新近发展起来的用于监测大范围地表形变的新技术,具有精度高、监测范围广等特点。文中深入分析DInSAR技术的基本原理,通过实验成功获取西安市中心城区相隔9个月的地面沉降结果,与常规方法获取的沉降图对比,发现二者具有高度的一致性,从而证明利用DInSAR技术监测城市地面沉降具有良好的应用前景。 相似文献
9.
提取滑坡形变数据、分析形变趋势对地质灾害防治工作具有指导意义.合成孔径雷达干涉测量技术(InSAR)具有全天候、全天时精确获取地表形变数据的能力,是当前形变监测的重要手段.分别利用DInSAR和SBAS-InSAR技术处理了22景哨兵一号(Sentinel-1)C波段数据,得到了四川省安州区高川乡大光包滑坡2018年3月-2020年2月的形变数据特征.结果表明,大光包滑坡点共有3个相对明显的形变区域;近两年的平均形变速率最高不超过100 mm/a,其形变时间序列随降雨量变化具有周期性;总体地表形变趋于稳定,周边地区中小型地震的发生没有造成地质灾害隐患. 相似文献
10.
11.
合成孔径雷达差分干涉测量(Differential Interferometric Synthetic Aperture Radar,DInSAR)在低相关区由于受时间空间去相关的影响,无法得到有效应用。角反射器DInSAR方法能在长时间段内保持幅度和相位稳定性,可以最大程度地减小去相关的影响。但由于反射器在空间上一般形成不规则稀疏网络分布,在平地相位、高程相位计算及相位展开方法上都带来新的挑战。研究三角反射器的DInSAR技术,重点分析基于不规则离散点的最小费用流相位展开算法。对费用流算法权重的选择,通过分析残差的产生来源,提出以弧所穿越的边长度倒数作为弧费用的权重设置方法,解决费用流算法中具有相同费用路径的选择问题。最后将角反射器DInSAR技术应用于滑坡移动的监测,通过对140d时间段的监测,得到与实测值具有较好一致性的结果。 相似文献
12.
Md Soyeb Alam Dheeraj Kumar R. S. Chatterjee Vijay Upreti 《Journal of the Indian Society of Remote Sensing》2018,46(10):1569-1580
Differential interferometric synthetic aperture radar (DInSAR) is a novel remote sensing technique to measure earth surface deformation. It is capable of obtaining dense information related to the deformation of a large area efficiently, economically and effectively. Therefore, DInSAR is a promising technology for monitoring the earth surface deformation related to some natural hazardous events, such as earthquake, volcano eruption, land subsidence, landslide. In present study, Conventional DInSAR technique have been applied to a mineral rich zone, coming under the Khetri copper belt, a part of Northern Aravali range of hillocks in India, predominant with mining activities since late 1960’s to address the possibility of deformation phenomena due to hard rock underground metal mining. Four interferometric SAR data sets of Radarsat-2 was used for the study area to address the subsidence/uplift phenomena. Further, results obtained from conventional DInSAR technique using Radarsat-2 data sets compared with results obtained from ground based observation technique for its validity. In both the techniques, deformation results obtained in terms of average subsidence rate in mm (quarterly basis) of points under study within mining zone of Mine-A has well agreed to each other. Further, it has been observed that average subsidence rate in mm (quarterly basis) obtained from space based observation and ground based observation are 5.6 and 6.67, respectively over the points under study in mining zone of Mine-A. 相似文献
13.
现代大地测量学的进展 总被引:4,自引:1,他引:4
经典大地测量学主要研究地球的几何形状、定向及其重力场,并关注在地球上点的定位、重力值。现代大地测量则已超过原来经典的研究内容,将原来所考虑的静态内容,在长距离、大范围、实时和高精度测量的条件下,和时间(历元)这一因素联系起来。此外,现代大地测量学提供和处理了涉及原来是地球动力学、行星学、大气学、海洋学、板块运动学和冰川学等学科所需的信息。现代大地测量学可以并已经涉及多种学科领域,并提供多种学科领域长期以来很难取得的数值和有可能解决它们相应的困惑,事实证明现代大地测量学业已形成了学科交叉意义上的一门科学,它将更大地影响和促进地球科学、环境科学和行星科学的发展。 相似文献
14.
Leonardo Cascini Gianfranco Fornaro Dario Peduto 《ISPRS Journal of Photogrammetry and Remote Sensing》2009,64(6):598-611
Landslide studies over large areas call for multidisciplinary analyses supported by accurate ground displacement measurements. At present, conventional techniques can be valuably complemented by innovative satellite techniques such as Differential SAR Interferometry (DInSAR), furnishing huge amounts of data at competitively affordable costs. This work investigates the remote sensed data potential in landslide studies starting from the awareness of the present constraints of the technique. To this end, with reference to a sample area–within the territory of the National Basin Authority of Liri-Garigliano and Volturno rivers (Central-Southern Italy)–for which detailed base and thematic maps are available, quantitative examples of DInSAR data coverage on both different land-uses and landslide-affected areas are shown. Then, an original tool for “a priori DInSAR landslide visibility zoning” is proposed to address the choice of the most suitable image datasets. Finally, referring to the visible zones, the outcomes of DInSAR data for checking/updating landslide inventory maps at 1:25,000 scale highlight appealing perspectives, also holding the promise of obtaining relevant information in the landslide hazard evaluation. 相似文献
15.
大地测量坐标框架和重力场求定的新进展 总被引:1,自引:0,他引:1
近几年来大地测量在坐标系统和坐标框架和ITRF,WGS84,GRS80等方面进行了很多研究和改善,本文介绍了坐标原点地心的移动,大地测量基本常数的更新,直至最新的ITRF2000和WGS84(1150)的推出。在求定重力场方面发展了卫星跟踪卫星(SST)测定地球重力场及其变化的新技术。这些使大地测量学提供和处理了涉及原来是地球动力学,行星学,大气学,海洋学、板块运动学和冰川学等学科所需的信息。事实上证明大地测量学业已形成为学科交叉意义上一门科学,它将更大的影响和促进地球科学,环境科学和行星科学的发展。 相似文献
16.
Ivan I. Mueller 《Journal of Geodesy》1985,59(2):181-188
Geodynamics has become the subject of intensive international research during the last decade, involving plate tectonics,
both on the intra-plate and inter-plate scale, i.e., the study of crustal movements, and the study of earth rotation and of
other dynamic phenomena such as the tides. Interrelated are efforts improving our knowledge of the gravity and magnetic fields
of the earth. A common requirement for all these investigations is the necessity for a well-defined reference coordinate system
(or systems) to which all relevant observations can be referred and in which theories or models for the dynamic behavior of
the earth can be formulated. In view of the unprecedented progress in the ability of geodetic observational systems to measure
crustal movements and the rotation of the earth, as well as in theory and model development, there is a great need for the
theoretical definition, practical realization, and international acceptance of suitable coordinate system(s) to facilitate
such work. This article deals with certain aspects of the establishment and maintenance of such a coordinate system. 相似文献
17.