Yx Tang

Yx Tang
Aerospace Information Research Institute,CAS · Key Lab for Digital Earth

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33
Publications
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352
Citations

Publications

Publications (33)
Article
Full-text available
The Coherent Pixels Technique Interferometry Synthetic Aperture Radar (CPT-InSAR) method of inverting surface deformation parameters by using high-quality measuring points possesses the flaw inducing sparse measuring points in non-urban areas. In this paper, we propose the Adaptive Coherent Distributed Pixel InSAR (ACDP-InSAR) method, which is an a...
Article
Full-text available
The Qinghai-Tibet Railway (QTR) is the railway with the highest elevation and longest distance in the world, spanning more than 1142 km from Golmud to Lhasa across the continuous permafrost region. Due to climate change and anthropogenic activities, geological disasters such as subsidence and thermal melt collapse have occurred in the QTR embankmen...
Article
Satellite interferometric synthetic aperture radar (InSAR) has been playing an important role in the earthquake surface deformation observation and source model inversions with its advantage of fine spatial resolution in comparison with seismological data. At present, the two-step inversion approach, including a nonlinear inversion step for determi...
Article
Full-text available
The three-dimensional (3-D) displacements of mining areas is the basis of studying the mining subsidence law and obtaining surface movement parameters. The traditional multi-temporal interferometry synthetic aperture radar (InSAR) technology can only obtain the surface deformation in line-of-sight (LOS) direction, even if some methods can obtain th...
Article
Full-text available
Synthetic aperture radar (SAR) data have been widely and primarily used for soil-moisture estimation. The original radar backscattering coefficients show great noise and temporal-spatial decorrelation due to complex surface features and seasonal vegetation changes, which increase the difficulty of soil-moisture estimation over the Qinghai-Tibet Pla...
Article
Full-text available
The dynamic changes of the thawing and freezing processes of the active layer cause seasonal subsidence and uplift over a large area on the Qinghai–Tibet Plateau due to ongoing climate warming. To analyze and investigate the seasonal freeze–thaw process of the active layer, we employ the new small baseline subset (NSBAS) technique based on a piecew...
Article
The Zongling landslide (Nayong, Guizhou, China) is dominated by a unique karst landscape area with many landslide masses. In this paper, an improved Interferometric Point Target Analysis (IPTA) method is proposed to identify and monitor the Zongling landslide. In this method, the Anderson-Darling test is applied to distributed scatterer (DS) select...
Article
Full-text available
Increasing near-surface temperature over the Qinghai-Tibet Plateau (QTP) has led to permafrost degradation and increasing active layer thickness (ALT). In this study, the ALT was estimated based on ground subsidence monitored by multitemporal interferometric synthetic aperture radar (MT-InSAR) and temporal-spatial multilayer soil moisture data. For...
Article
The Qinghai-Tibet Railway (QTR) is the highest plateau artificial facility, connecting Lhasa and Golmud over Qinghai-Tibet Plateau. Climate change and anthropogenic activities are changing the condition of plateau, with potential influences on the stabilities of QTR. Synthetic aperture radar interferometry (InSAR) technique could retrieve ground mi...
Article
Full-text available
Permafrost is widely distributed in the Tibetan Plateau. Seasonal freeze-thaw cycles o permafrost result in upward and downward surface displacement Multitemporal interferometric synthetic aperture radar (MT-InSAR) observations provide an effective method for monitoring permafrost displacement under difficult terrain and climatic conditions. In thi...
Conference Paper
TomoSAR, as one of the hot technical topics these years, gives an advanced way to use the single orbit multiple baselines SAR images. Among the many TomoSAR methods, the sparse based spectrum estimator is the most popular one. In this paper, we make use of the truncation version of multiple snapshots of compressive sensing (MCS), called L1-SVD, for...
Article
This study presents a comprehensive deformation retrieval method based on the multi-baseline synthetic aperture radar interferometry InSAR technique for ground movement monitoring. Both the displacement pattern in at the large scale and detailed deformation for local areas are investigated by exploiting two sets of data generated at low and full sp...
Conference Paper
This paper presents a non-supervised method for shoreline extraction from high resolution synthetic aperture radar (SAR) image. The proposed technique is based on level set with all the parameters optimized in order to be used with different kinds of SAR data and to find the desired boundary with a minimize number of iterations so as to be fast eno...
Conference Paper
In this paper, we will propose a novel polarimetric SAR (PoISAR) change detection method applied to specific land cover type. Firstly, a polarimetric SAR interferometry (PolInSAR) coherency matrix is used to simultaneously take into account the full polarimetric information from both images. Then, a generalized likelihood ratio test (GLRT) statisti...
Conference Paper
In this paper, we will propose a novel PolSAR change detection method applied to specific land cover type, i.e., from class ωi to class ωj. Firstly, a new distance measure is derived to extract the difference map belonging to the specified change. Then, Kittler and Illingworth (KI) minimum error threshold segmentation method is applied to obtain th...
Article
Full-text available
Three time series of quad-polarization RADARSAT-2 images have been acquired from transplanting to harvesting of rice crop. Ground truth data such as rice height and biomass etc. were measured during acquisition of RADARSAT-2 data in Hainan province, southern China. Among different observations, dry biomass and fresh biomass of rice crop have shown...
Conference Paper
This study presents a dynamic deformation retrieval method for differential synthetic aperture radar interferometry (DInSAR) processing. Detailed nonlinear displacement parameters are modeled and estimated for capturing the developing trends of ground movement both in time and space. In order to reduce the system disturbance errors such as atmosphe...
Conference Paper
Persistent Sactterers Interferometry(PSI) technique is a series of advanced DInSAR methods which can reconstruct the time-series deformation of those coherent points in the direction of the satellite line-of-sight(LOS) with millimetric accuracy over a long temporal scale. It overcomes the problems caused by temporal and geometric decorrelations and...
Article
Full-text available
This letter presents preliminary results of an attempt to monitor rice crop growth using RADARSAT-2 quad- polarization synthetic aperture radar (SAR) data. Three RADARSAT-2 quad-polarization SAR images are collected from transplanting to rice crop harvesting. Ground truth data, such as rice height and biomass, are measured during RADARSAT-2 data ac...
Article
The devastating Wenchuan Earthquake occurred in Sichuan Province, Southwestern China, with a magnitude of 8.0 on May 12, 2008. Most buildings along the seismic zone were ruined, resulting in infrastructure damage to factories, traffic facilities and power supplies. The earthquake also triggered geological disasters, such as landslides, debris flow,...
Conference Paper
On May 12, 2008, Wenchuan earthquake (Ms 8.0) occurred in Sichuan, Southwestern China. This catastrophe caused severe damage of constructions in urban and rural areas, and fundamental infrastructure, such as those facilities of factories, electrical power, telecommunication and transportation, etc. The earthquake also resulted in many geological ph...
Article
The investigation of slow displacement in urban areas using the multi-baseline DInSAR technique has been a hot research topic in the field of DInSAR. The basic flow of this technique includes several steps such as the combination of interferometric image pairs, generation of differential interferograms, selection of high coherent points, generation...
Article
The DInSAR technique with a multibaseline is becoming popular nowadays to investigate slow urban deformation. In this paper, we focus on deformation retrieval in large areas, including urban and suburban areas. Based on the multibaseline DInSAR algorithm proposed by Mora, three extensions are derived. First, least‐squares adjustment and error‐contr...
Conference Paper
In this paper, change detection with multi-polarization SAR imagery is focused. Based on the polarimetric statistic distribution, a polarimetric test statistic is applied to evaluate the equality of two areas in two pass polarimetric SAR images. And then, in order to find out the `real' changed area, a constant false alarms rate (Pfa) is given to d...
Conference Paper
With the fast development of urban economy, damage due to surface subsidence becomes more and more severe. The routine measures for monitoring the subsidence are leveling and GPS measurement. Their advantage is that they have higher accuracy. However, their costs are very high and their sampling density is very low. Therefore, routine techniques ar...
Conference Paper
In order to meet the need of the development in interferometric SAR, especially the development of Permanent Scatterers InSAR(PS-InSAR) in these years, we develop a new software called CAESAR-XInSAR at the Remote-Sensing Satellite Ground Station, CAS. Both conventional InSAR and PS- InSAR are considered in this system. It supports the interferometr...
Article
This paper applies SAR Interferometry for ground deformation in two cases: the 1998 Zhangbei-Shangyi Earthquake in Northern China and the urban subsidence in Suzhou City from 1993 to 2000. It is concluded that SAR interferometry may provide valuable information for understanding the spatial patterns and progress of natural hazards. SAR interferomet...
Article
On 10 January, 1998 an earthquake of M s=6.2 occurred in the Zhangbei-Shangyi region of North China. The surface seismic deformation was measured in the previous study using the 3 pass ERS-1/2 SAR differential interferometric technology (D-INSAR). In this note the focal mechanism of Zhangbei-Shangyi earthquake is estimated from the D-INSAR measurem...
Article
Full-text available
Being an active remote sensing technique, interferometric SAR has been widely applied in DEM generation and earth surface deformation monitoring over a large coverage with high precision accuracy on day and night. Especially since the technique called Permanent Scatterers Interferometry (PS-INSAR) was proposed by Ferretti [1] et al. in 1999, a numb...

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