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In this study, a highway slope monitoring project for a section of US highway I-77 in Virginia was carried out with the InSAR technique. This paper attempts to provide insights into the complete and practical solution for the monitoring project, including two parts: what to consider for selecting the optimal satellites and configurations for the given area of interest (AoI) and budget; and how to best process the selected data for the monitoring purposes. To answer the first question, the simulated geometric distortion map, cumulative change detection map, intensity map, interferograms and coherence maps from all available historical datasets were generated. The satellite configuration that gives the best coherence and least geometric distortion with the given budget was selected for the monitoring project. For this project, it was the X-band COSMO stripmap with 3 m resolution and eight-days revisit time. To answer the second question, a multi-temporal InSAR (MTInSAR) was applied to retrieve the settlement time series of the slopes along the highway. Several special techniques were applied to increase the level of confidence, i.e., dividing AoI into smaller and independent areas, using a non-linear approach, etc. Finally, fieldwork was carried out for the interpretation and validation of the results. The AoI was overall stable, though some local changes were detected by the SAR signal which were validated by the fieldwork.
Yuxiao Qin; Edward Hoppe; Daniele Perissin. Slope Hazard Monitoring Using High-Resolution Satellite Remote Sensing: Lessons Learned from a Case Study. ISPRS International Journal of Geo-Information 2020, 9, 131 .
AMA StyleYuxiao Qin, Edward Hoppe, Daniele Perissin. Slope Hazard Monitoring Using High-Resolution Satellite Remote Sensing: Lessons Learned from a Case Study. ISPRS International Journal of Geo-Information. 2020; 9 (2):131.
Chicago/Turabian StyleYuxiao Qin; Edward Hoppe; Daniele Perissin. 2020. "Slope Hazard Monitoring Using High-Resolution Satellite Remote Sensing: Lessons Learned from a Case Study." ISPRS International Journal of Geo-Information 9, no. 2: 131.
This article describes the technical implementation of a “stripmap-like” interferometric processing flow that could be used for both Terrain Observation with Progressive Scans (TOPS) and ScanSAR. In this “stripmap-like” approach, the discontinuous bursts of wide swath mode for the same subswath are stitched into a continuous single look complex (SLC) image at the very beginning of the processing chain. For users who wish not to get into the complexity behind the wide swath mode and simply want to use the interferometric products, this implementation provides the identical processing steps and output products to the stripmap case. This implementation also features a user-friendly processing interface, where all the wide-swath-related processes are hidden under the hood. In addition, this approach makes the best use of an existing standard InSAR processing software. In this article, the complete common processing chain for TOPS and ScanSAR is elaborated and some key issues are discussed, starting from stitching, deramping to coregistration and enhanced spectral diversity (ESD). The authors also introduce a quick implementation of fine coregistration during the ESD step that does not require resampling the slave image using the conventional method.
Yuxiao Qin; Daniele Perissin; Jing Bai. A Common “Stripmap-Like” Interferometric Processing Chain for TOPS and ScanSAR Wide Swath Mode. Remote Sensing 2018, 10, 1504 .
AMA StyleYuxiao Qin, Daniele Perissin, Jing Bai. A Common “Stripmap-Like” Interferometric Processing Chain for TOPS and ScanSAR Wide Swath Mode. Remote Sensing. 2018; 10 (10):1504.
Chicago/Turabian StyleYuxiao Qin; Daniele Perissin; Jing Bai. 2018. "A Common “Stripmap-Like” Interferometric Processing Chain for TOPS and ScanSAR Wide Swath Mode." Remote Sensing 10, no. 10: 1504.
In Sentinel-1 TOPS mode, the antenna sweeps in the azimuth direction for the purpose of illuminating the targets with the entire azimuth antenna pattern (AAP). This azimuth sweeping introduces an extra high-frequency Doppler term into the impulse response function (IRF), which poses a more strict coregistration accuracy for the interferometric purpose. A 1/1000 pixel coregistration accuracy is required for the interferometric phase error to be negligible, and the enhanced spectral diversity (ESD) method is applied for achieving such accuracy. However, since ESD derives miscoregistration from cross-interferometric phase, and phase is always wrapped to [ − π , π ) , an initial coregistration method with enough accuracy is required to resolve the phase ambiguity in ESD. The mainstream for initial coregistration that meets this requirement is the geometrical approach, which accuracy mainly depends on the accuracy of orbits. In this article, the authors propose to investigate the feasibility of using the conventional coregistration approach, namely the cross-correlation-and-rigid-transformation, as the initial coregistration method. The aim is to quantify the coregistration accuracy for cross-correlation-and-rigid-transformation using the Cramér-Rao lower bound (CRLB) and determine whether this method could eventually help to resolve the phase ambiguities of ESD. In addition, we studied the feasibility and robustness of the cross-correlation plus ESD under different conditions. For validation, we checked whether the cross-correlation plus ESD approach could reach the same coregistration accuracy as geometrical plus ESD approach. In general, for large areas with enough coherence and little topography variance, the cross-correlation method could be used as an alternative to the geometrical approach. The interferogram from the two different approaches (with ESD applied afterward) shows a negligible difference under such circumstances.
Yuxiao Qin; Daniele Perissin; Jing Bai. Investigations on the Coregistration of Sentinel-1 TOPS with the Conventional Cross-Correlation Technique. Remote Sensing 2018, 10, 1405 .
AMA StyleYuxiao Qin, Daniele Perissin, Jing Bai. Investigations on the Coregistration of Sentinel-1 TOPS with the Conventional Cross-Correlation Technique. Remote Sensing. 2018; 10 (9):1405.
Chicago/Turabian StyleYuxiao Qin; Daniele Perissin; Jing Bai. 2018. "Investigations on the Coregistration of Sentinel-1 TOPS with the Conventional Cross-Correlation Technique." Remote Sensing 10, no. 9: 1405.
This brief study introduces a partially working concept being developed at IT4Innovations supercomputer (HPC) facility. This concept consists of several modules that form a whole body of an efficient system for observation of terrain or objects displacements using satellite SAR interferometry (InSAR). A metadata database helps to locate data stored in various storages and to perform basic analyzes. A special database has been designed to describe Sentinel-1 data, on its burst level. Custom Sentinel-1 TOPS processing algorithms allow an injection of coregistered bursts into the database. Once the area of interest is set and basic processing parameters are given, the selected data are merged and processed by the Persistent Scatterers (PS) InSAR method or an optimized Small Baselines (SB) InSAR derivative. Depending on the expected deliverables, the processing results can be post-analyzed using a custom approach, in order to achieve a set of reliable measurement points. Final results can be post-processed and visualized using a custom GIS toolbox, consisting in open-source GIS functionality. The GIS post-processing is enforced by HPC power as well. To demonstrate the practical applicability of the described system, a subsidence area in Konya city, Turkey is used as the study area for Sentinel-1 InSAR evaluation
Milan Lazecky; Fatma Canaslan Comut; Matus Bakon; Yuxiao Qin; Daniele Perissin; Emma Hatton; Karsten Spaans; Pablo J. Gonzalez Mendez; Pedro Guimaraes; Joaquim J.M. de Sousa; David Kocich; Aydin Ustun. Concept of an Effective Sentinel-1 Satellite SAR Interferometry System. Procedia Computer Science 2016, 100, 14 -18.
AMA StyleMilan Lazecky, Fatma Canaslan Comut, Matus Bakon, Yuxiao Qin, Daniele Perissin, Emma Hatton, Karsten Spaans, Pablo J. Gonzalez Mendez, Pedro Guimaraes, Joaquim J.M. de Sousa, David Kocich, Aydin Ustun. Concept of an Effective Sentinel-1 Satellite SAR Interferometry System. Procedia Computer Science. 2016; 100 ():14-18.
Chicago/Turabian StyleMilan Lazecky; Fatma Canaslan Comut; Matus Bakon; Yuxiao Qin; Daniele Perissin; Emma Hatton; Karsten Spaans; Pablo J. Gonzalez Mendez; Pedro Guimaraes; Joaquim J.M. de Sousa; David Kocich; Aydin Ustun. 2016. "Concept of an Effective Sentinel-1 Satellite SAR Interferometry System." Procedia Computer Science 100, no. : 14-18.
The persistent scatterers interferometry (PSI) technique is gradually becoming known for its capability of providing up to millimeter accuracy of measurement on ground displacement. Nevertheless, there is still quite a good amount of doubt regarding its correctness or accuracy. In this paper, we carried out an experiment corroborating the capability of the PSI technique with the help of a traditional survey method in the urban area of Hong Kong, China. Seventy three TerraSAR-X (TSX) and TanDEM-X (TDX) images spanning over four years are used for the data process. There are three aims of this study. The first is to generate a displacement map of urban Hong Kong and to check for spots with possible ground movements. This information will be provided to the local surveyors so that they can check these specific locations. The second is to validate if the accuracy of the PSI technique can indeed reach the millimeter level in this real application scenario. For validating the accuracy of PSI, four corner reflectors (CR) were installed at a construction site on reclaimed land in Hong Kong. They were manually moved up or down by a few to tens of millimeters, and the value derived from the PSI analysis was compared to the true value. The experiment, carried out in unideal conditions, nevertheless proved undoubtedly that millimeter accuracy can be achieved by the PSI technique. The last is to evaluate the advantages and limitations of the PSI technique. Overall, the PSI technique can be extremely useful if used in collaboration with other techniques, so that the advantages can be highlighted and the drawbacks avoided.
Yuxiao Qin; Daniele Perissin. Monitoring Ground Subsidence in Hong Kong via Spaceborne Radar: Experiments and Validation. Remote Sensing 2015, 7, 10715 -10736.
AMA StyleYuxiao Qin, Daniele Perissin. Monitoring Ground Subsidence in Hong Kong via Spaceborne Radar: Experiments and Validation. Remote Sensing. 2015; 7 (8):10715-10736.
Chicago/Turabian StyleYuxiao Qin; Daniele Perissin. 2015. "Monitoring Ground Subsidence in Hong Kong via Spaceborne Radar: Experiments and Validation." Remote Sensing 7, no. 8: 10715-10736.
PSInSAR technology has been proved to be a powerful tool for monitoring urban ground displacement information to a millimetric accuracy. When it comes to the validation of PS-derived ground deformation, artificial corner reflector (CR) can be very useful due to its relative stability and high signal-to-noise ratio (SNR). In this paper, we will evaluate some general criteria for designing and setting up corner reflectors, including the shape, size, material, location, and others. An ideal prototype known as the rectangular trihedral with special designs is brought up in this paper, and validation experiments were conducted in Hong Kong to demonstrate the ability of the proposed prototype. The field data agreed with theoretical analysis, bringing up an economical and applicable approach for CR application in urban ground deformation monitoring.
Yuxiao Qin; Daniele Perissin; Ling Lei. The Design and Experiments on Corner Reflectors for Urban Ground Deformation Monitoring in Hong Kong. International Journal of Antennas and Propagation 2013, 2013, 1 -8.
AMA StyleYuxiao Qin, Daniele Perissin, Ling Lei. The Design and Experiments on Corner Reflectors for Urban Ground Deformation Monitoring in Hong Kong. International Journal of Antennas and Propagation. 2013; 2013 ():1-8.
Chicago/Turabian StyleYuxiao Qin; Daniele Perissin; Ling Lei. 2013. "The Design and Experiments on Corner Reflectors for Urban Ground Deformation Monitoring in Hong Kong." International Journal of Antennas and Propagation 2013, no. : 1-8.