检索结果-南通市图书馆

Unsupervised change detection of man-made objects using coherent and incoherent features of multi-temporal SAR images

引用

Journal of Systems Engineering and Electronics 2022年第4期33卷 896-906页

作者： FENG Hao WU Jianzhong ZHANG Lu liao mingsheng State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhan 430079China Key Laboratory of Land Subsidence Monitoring and Prevention Ministry of Land and ResourcesShanghai 200072China Shanghai Engineering Research Center of Land Subsidence Shanghai 200072China Shanghai Institute of Geological Survey Shanghai 200072China

Constrained by complex imaging mechanism and extraordinary visual appearance,change detection with synthetic aperture radar(SAR)images has been a difficult research topic,especially in urban *** existing studies have extended from bi-temporal data pair to multi-temporal datasets to derive more plentiful information,there are still two problems to be solved in practical ***,change indicators constructed from incoherent feature only cannot characterize the change objects ***,the results of pixel-level methods are usually presented in the form of the noisy binary map,making the spatial change not intuitive and the temporal change of a single pixel *** this study,we propose an unsupervised man-made objects change detection framework using both coherent and incoherent features derived from multi-temporal SAR *** coefficients of variation in timeseries incoherent features and the man-made object index(MOI)defined with coherent features are first combined to identify the initial change ***,an improved spatiotemporal clustering algorithm is developed based on density-based spatial clustering of applications with noise(DBSCAN)and dynamic time warping(DTW),which can transform the initial results into noiseless object-level patches,and take the cluster center as a representative of the man-made object to determine the change pattern of each *** experiment with a stack of 10 TerraSAR-X images in Stripmap mode demonstrated that this method is effective in urban scenes and has the potential applicability to wide area change detection.

关键词： change detection multi-temporal synthetic aperture radar(SAR)data coherent and incoherent features clustering

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Iteration convergence condition modeling for single spaceborne SAR image direct positioning

引用

Geo-Spatial Information Science 2016年第4期19卷 278-284页

作者： Yuting Dong Lu Zhang mingsheng liao State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing(LIESMARS)Wuhan UniversityWuhanChina Collaborative Innovation Center for Geospatial Technology Wuhan UniversityWuhanChina

Single SAR image direct positioning is to determine the ground coordinate for each pixel in the SAR image assisted with a reference *** this procedure,an iterative procedure is essentially needed to solve the uncertainty in elevation of each pixel in the SAR ***,such an iterative procedure may suffer from the problem of divergence in shaded and serious layover *** investigate this problem,we performed a theoretical analysis on the convergence conditions that has not been intensively studied till *** Range-Doppler(RD)model was simplified and then the general surface is degenerated into a planar *** deduction was then carried out to derive the convergence conditions and the impact factors for the convergence speed were *** theoretical findings were validated by experiments for both simulated and real scenarios.

关键词： Direct positioning RD model SAR iteration convergence condition

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Absolute geolocation accuracy of high-resolution spotlight TerraSAR-X imagery–validation in Wuhan

引用

Geo-Spatial Information Science 2016年第4期19卷 267-272页

作者： Jinghui Wang Timo Balz mingsheng liao State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing(LIESMARS)Wuhan UniversityWuhanChina Collaborative Innovation Center for Geospatial Technology Wuhan UniversityWuhanChina

TerraSAR-X(TSX)can acquire high-resolution SAR images and due to its high orbit precision as well as its ability to acquire data from different off-nadir viewing angles,the high-precision stereo geolocation can be *** this study,we investigate the absolute geolocation accuracy of TSX high-resolution images in Wuhan,*** present a direct stereo SAR geolocation method and analyze the 2D and 3D geoposition accuracy of two corner *** sub-meter localization accuracy was achieved using only atmospheric correction information available in the TSX metadata.

关键词： Geolocation stereo SAR TerraSAR-X GPS

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Change detection, risk assessment and mass balance of mobile dune fields near Dunhuang Oasis with optical imagery and global terrain datasets

引用

International Journal of Digital Earth 2020年第12期13卷 1604-1623页

作者： Chao Ding Guangcai Feng mingsheng liao Lu Zhang State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhanPeople’s Republic of China School of Geosciences and Info-Physics Central South UniversityChangshaPeople’s Republic of China

Quantifying the kinematic evolution patterns of dune migration plays a major role in resisting the sand-dust disasters and evaluating the desertification *** the increment of optical observations,measuring the dune migration with dense spatial and temporal density has become *** this study,with the open-accessible Landsat-8(L8)/Sentinel-2(S2)imagery and global terrain datasets,we designed a complete workflow of inverting the dune displacement time series and velocity,identifying the potential encroachment risk,and evaluating the sediment balance of mobilized dune fields near Dunhuang *** the performance of time-series inversion,the standard deviation(STD)of measurements in stable area of raw correlation results was improved by above 40%.The displacement time series and velocity revealed out the spatial heterogeneity and seasonal/inter-annual dynamic evolution of dune ***,dune encroachment risk in the immediate vicinity of local landscapes was evaluated to highlight the unstable dune fields,and the workability of existent sand-control ***,the mass budget of around−0.001±0.025 m/yr shows the stable sediment transport in Mingsha *** study case can be exemplified to lead the risk monitoring and sustainable conservation of Dunhuang region and other places controlled by similar climatic conditions.

关键词： Change detection risk assessment mass balance dune migration Dunhuang oasis

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Taiyuan City Subsidence Observed with Persistent Scatterer InSAR

引用

Wuhan University Journal of Natural Sciences 2014年第6期19卷 526-534页

作者： TANG Wei liao mingsheng State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University

C- and X-bands Synthetic Aperture Radar（SAR） images acquired from February 2009 to September 2010 were processed with Persistent Scatterer Interferometry（PS-InSAR） algorithm to investigate spatial and temporal variations in deformation over Taiyuan City, China. The spatial pattern of subsidence and the magnitude of subsidence rate are similar in the velocity field maps achieved by the algorithm from these two data sets. It shows that there are four primary subsidence centers in Taiyuan City：Xiayuan, Wujiabao, Xiaodian, Sunjiazhai, which are near the groundwater extraction wells. The maximum subsidence rate is up to 70 mm/year at Sunjiazhai. The locus of maximum subsidence has shifted from its historical location in the north to the south. In view of the severe shortage of water resources and presented features of subsidence over Taiyuan City, we inferred that excessive pumping of groundwater was the dominant reason of land subsidence.

关键词： ground subsidence Synthetic Aperture Radar interferometry persistent scatterer

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Decomposing and mapping different scales of land subsidence over Shanghai with X-and C-Band SAR data stacks

引用

International Journal of Digital Earth 2022年第1期15卷 478-502页

作者： Ru Wang Mengshi Yang Tianliang Yang Jinxin Lin mingsheng liao State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhanPeople’s Republic of China School of Earth Sciences Yunnan UniversityKunmingPeople’s Republic of China Key Laboratory of Land Subsidence Monitoring and Prevention Ministry of Land and ResourcesShanghaiPeople’s Republic of China Shanghai Institute of Geological Survey ShanghaiPeople’s Republic of China

Land subsidence can be observed with time-series of Interferometric Synthetic Aperture Radar(InSAR)***,existing approaches only reveal subsidence signals that are multi-scale mixed,which is not conducive to the systematic analysis of subsidence of different mechanisms.A deformation signal decomposition(DSD)method based on spectral analysis is used to decompose the deformation extracted by time-series InSAR into three classes of deformation *** refer to large-scale deformation related to geological settings,medium-scale deformation caused more by group excavation,and small-scale deformation along linear ***-X datasets for Shanghai spanning April 2013 to September 2020,and Sentinel-1A datasets spanning January 2016 to September 2020 are used in this *** results were cross-verified between the TerraSAR-X and Sentinel-1A datasets,and validated against levelling *** signals caused by different mechanisms were automatically decomposed,which facilitates a systematic analysis for targeted diagnosis of land subsidence signals.A detailed analysis was conducted jointly at three scales of surface displacement,geological conditions,major construction activities,and subsidence *** indicated that construction activities were the leading cause of land subsidence,and suggests that local authorities that wish to mitigate surface subsidence may benefit from primarily considering this process.

关键词： Deformation decomposition land subsidence time-series InSAR Shanghai

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Monitoring the built-up environment of Shanghai on the street-block level using SAR and volunteered geographic information

引用

International Journal of Digital Earth 2017年第7期10卷 675-686页

作者： Michael Jendryke Stephen C.McClure Timo Balz mingsheng liao State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhanPeople’s Republic of China Collaborative Innovation Center for Geospatial Technology Wuhan UniversityWuhanPeople’s Republic of China

In this geo-statistical analysis of change detection,we illustrate the evolution of the built-up environment in Shanghai at the street-block *** on two TerraSAR-X image stacks with 36 and 15 images,covering the city centre of Shanghai for the time period from 2008 to 2015,a set of coherence images was created using a small baseline *** road network from Open Street Map,a volunteered geographic information product,serves as the input dataset to create street-blocks.A street-block is surrounded by roads and resembles a ground parcel,a real estate property–a cadastral *** coherence information is aggregated to these street-blocks for each observation and the variation is analysed over *** analysis of spatial autocorrelation reveals clusters of similar *** result is a detailed map of Shanghai highlighting areas of *** argue that the aggregation and grouping of synthetic aperture radar coherence image information to real-world entities(street-blocks)is comprehensible and relevant to the urban planning ***,this research is a contribution to the community of urban planners,designers,and government agencies who want to monitor the development of the urban landscape.

关键词： SAR change detection urban area volunteered geographic information

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Elevation change around Dome A region of Antarctica from EnviSat satellite radar altimetry during 2002–2012

引用

Geo-Spatial Information Science 2015年第4期18卷 193-199页

作者： Qiang QIANG Chunxia ZHOU mingsheng liao Qiuyang ZHAO Zemin WANG Chinese Antarctic Center of Surveying and Mapping Wuhan UniversityWuhan 430079China Key Laboratory of Polar Surveying and Mapping National Administration of SurveyingMapping and GeoinformationWuhan UniversityWuhan 430079China State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhan 430079China

The expected responses of ice sheets to climate warming are growth in the thickness of the inland ice areas and thinning near the *** recent decades,researchers have identified glacier acceleration along Antarctic ice sheet coastal ***,the study of ice sheet interiors where seasonal accumulation eventually balances ice wastage at the lower elevation is poorly *** this paper,the ice sheet elevation change around Dome A region is analyzed from 2002 to 2012 using two million elevation change measurements from EnviSat satellite radar altimeter data covering an area of about 7000 km2.A declining trend of 0.572±1.31 mm/year which means that the Dome A region was in balance during the last decade can be *** addition,two obvious changes in accumulation which divide elevation change time series into three independent equilibration stages are also *** order to explain this phenomenon,two speculations related to snowfall and firn compaction are proposed in this paper.

关键词： elevation change satellite radar altimetry Dome A Antarctica

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Monitoring Surface Deformation Using Distributed Scatterers InSAR

引用

Journal of Geodesy and Geoinformation Science 2024年第1期7卷 42-58页

作者： LI Haocheng DONG Jie WANG Yi’an liao mingsheng State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhan 430079China School of Remote Sensing and Information Engineering Wuhan UniversityWuhan 430079China

In the past two decades,extensive and in-depth research has been conducted on Time Series InSAR technology with the advancement of high-performance SAR satellites and the accumulation of big SAR *** introduction of distributed scatterers in Distributed Scatterers InSAR(DS-InSAR)has significantly expanded the application scenarios of InSAR geodetic measurement by increasing the number of measurement *** study traces the history of DS-InSAR,presents the definition and characteristics of distributed scatterers,and focuses on exploring the relationships and distinctions among proposed algorithms in two crucial steps:statistically homogeneous pixel selection and phase ***,the latest research progress in this field is tracked and the possible development direction in the future is *** simulation experiments and two real InSAR case studies,the proposed algorithms are compared and verified,and the advantages of DS-InSAR in deformation measurement practice are *** work not only offers insights into current trends and focal points for theoretical research on DS-InSAR but also provides practical cases and guidance for applied research.

关键词： InSAR permanent scatterers distributed scatterers statistically homogeneous pixel selection phase optimization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Potential loess landslide deformation monitoring using L-band SAR interferometry

引用

Geo-Spatial Information Science 2016年第4期19卷 273-277页

作者： Yuzhou Liu mingsheng liao Xuguo Shi Lu Zhang Cory Cunningham State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing(LIESMARS)Wuhan UniversityWuhanChina Collaborative Innovation Center for Geospatial Technology WuhanChina Southern Alberta Institute of Technology CalgaryCanada

Multi-temporal InSAR technique can implement continuous earth surface deformation detection with long time scale and wide geographical *** this paper,we first employ the Small Baseline Subset method to survey potential landslides in Guide County,Qinghai Province,which is identified as a loess landslide prone area for geological and climate *** anomalous deformation regions are detected by L-band Phased Array and L-band Synthetic Aperture Radar ***,qualitative and quantitative evaluations of the measuring points are given for understanding the distribution regularity of ***,preliminary correlation between the time-series deformation and triggering factors is analyzed to explore the driving mechanism for landslide *** results demonstrate that L-band SAR has high potential in landslide monitoring applications and can be used as the basis for landslide recognizing,precursory information extracting,and early warning.

关键词： Potential loess landside deformation detection Small Baseline Subset(SBAS) rainfall

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：