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Detection cof multiple scatterers for localizing the targets is one of the key issues in SAR tomography. Recently, a Generalized Likelihood Ratio Test based on support estimation (Sup-GLRT) [10] has been presented. This test exhibits a high computational complexity. In this paper a modified approach for reducing computational complexity (Fast-Sup-GLRT) is proposed. The prime objective is to analyze...
Remote sensing technology plays an important role in gathering information of social infrastructure damage which is crucial for relief and reconstruction work after strike. Comparatively speaking, radar sensors are capable of observing the ground irrespective of weather conditions or the time of the day, and therefore have been gaining prominence as a reliable tool for grasping the overall picture...
The forest aboveground biomass and its dynamics are essential for researches of carbon cycling. The estimation of forest aboveground biomass is an important topic in the application of remote sensing. However, the estimation accuracy is limited by the lack of forest structures. Recent progresses over the past decade in the estimation of forest biomass from remote sensing data was mainly due to the...
The aim of this study was to estimate soil moisture from RADARSAT-2 Quad-polarization Synthetic Aperture Radar (SAR) data acquired in the agricultural areas. The adopted approach is based on the combination of semi-empirical Water-Cloud model and Dubois model. Firstly, VH backscattering coefficient was used to develop empirical relationship for crop water content estimation. Secondly, crop water content...
This paper focuses on the displacement Estimation and deformation monitoring experiment analysis based on Time series data. The experimental results demonstrate the validity and correctness of the methods in the paper, and the slope monitoring using ground based SAR is proved to be effective.
In this paper, SAR MT imaging and velocity estimation method is proposed. The validity of this method is verified by numerical simulations. The main idea behind this method is to transform the PE problem to be a SOP problem. The advantages of this method include two main aspects: (i) This method can handle the MT imaging problem for different SAR modes, such as mono-static SAR, bistatic SAR, etc.;...
In this letter, an improved kernel density estimation (KDE) constant false alarm rate (CFAR) method is proposed for ship detection in single polarization synthetic aperture radar (SAR) images. The proposed method consists of a target enhancement filter, an adaptive KDE bandwidth estimation method and an improved KDE-CFAR. The gravity-based target enhancement filter is utilized to remove the inhomogeneity...
An approach to estimate tree height of coniferous forest in mountainous areas at plateau was developed using a combined function. One pair of dual Pol- InSAR images acquired on 20 June 2007 and 5 August 2007 by Advanced Land Observing Satellite Phased Array L-band Synthetic Aperture Radar (ALOS-PALSAR) sensor over Zoige plateau, northwestern Sichuan, China was used to evaluate the approach. The derived...
This paper presents a three-dimensional (3-D) target reconstruction characterized by its geometric components, i.e. canonical scattering objects. The target is decomposed into some primitive geometries, which are extracted to represent and characterize scattering features. The object parameters are estimated in the frequency domain based on the least square method, and all estimated objects uses the...
In this study, an advanced InSAR time-series analysis technique was applied to obtain the ground subsidence result in Hong Kong International Airport with 29 TerraSAR-X SpotLight images. In oder to improve the accuracy of monitoring points and the quality of both interferogram and coherence, the NL-InSAR filter is adopted in this processing framework. The result demonstrates the great prospects of...
SAR data and its texture features are used to estimate the ice thickness over Liaodong Bay with ice model thickness. Sea ice and open water discrimination works well for dual-polarized data using a simple linear model. For ice thickness estimation the number of data points is too limited, but relatively good estimates can be extracted using the leave-one-out approach. The leave-one-out ice thickness...
Advanced Interferometric SAR (InSAR) technique, namely, Persistent Scatterer Interferometry (PSI), allows long term deformation time series analysis with millimeter accuracy. Reference network arcs construction, arcs estimation and integration for PSs are an important step in PSI. In rural regions, low density of PSs leads to separate clusters during reference network construction. Also, in case of...
A method of building height extraction from multi-polarization SAR imagery, taking radarsat-2 as an example, was proposed based on backscatter model. First, the connected component of double-scatter of the buildings in the image was analyzed and its contribution to radar cross section was got simultaneously—a case study in urban areas of Beijing, China. Then, optimal polarized combination was utilized,...
The Improved TD-RVoG model was combined with the classical forest inversion algorithm, three-stage inversion method, for the estimation of forest height by using single baseline spaceborne PolInSAR data. Previous research [6–7] has shown temporal decorrelation reduces the interferometric coherence and increases the deviation of the interferometric phase. The Improved TD-RVoG model considers the both...
Systems based on Synthetic Aperture Radar Tomography at low frequencies offer 3D imaging capabilities, appropriate for forest monitoring. However the extraction of an ecologically meaningful measure of forest structure from the 3D reflectivity is not straightforward and several considerations need to be carefully taken into account, in order to avoid misinterpretations of the nature of the information...
This paper presents change detection using very high resolution SAR data. Small patches of SAR data were used for graphical Lasso based algorithm. The graphical Lasso for time series is defined as solution of an l1-regularized maximum likelihood problem. The optimization problem was solved using alternating direction method of multipliers (ADMM). The time series of patches was observed. The efficiency...
Two extraction models applied in estimating forest height and above-ground biomass (AGB) were developed using the X-band Interferometric Synthetic Aperture Radar (InSAR) data, which was acquired from the China airborne SAR system in 2013 covering part of forested area in northeast China. The models using multi-passes InSAR data for the estimations of forest height and AGB were introduced respectively...
This paper presents a landslide prediction method based on soil moisture estimation obtained by fully polarimetric Synthetic Aperture Radar (SAR) data and surface topography acquired by Shuttle Radar Topographic Mission (SRTM). In order to solve the problem of geometric distortion caused by topography, the study area is classified as measurable and non-measureable areas in terms of the terrain slope...
This paper proposed a modified Water Cloud Model (MWCM) for rice variable estimation during the whole growth season with eight RADARSAT-2 quad-pol SAR images. The improvements achieved with the MWCM include considering the heterogeneity of water content of the rice canopy in different directions and different phenologies, and applying the scattering components from an improved polarimetric decomposition...
In this paper we extend the Fast-Sup-GLRT Detector, designed for SAR tomography (3D-SAR), to the detection of multiple scatterers that can exhibit time deformation. It assumes at most Kmax different scatterers in the same range-azimuth resolution cell with a phase model that takes into account phase variations due to the deformation and/or dilation of the scatterer(s). Results on simulated and real...
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