Swelling soils may induce small surface displacements under various climatic conditions, that may... more Swelling soils may induce small surface displacements under various climatic conditions, that may affect individual buildings. The aim of this work, funded by MAIF foundation (Insurance foundation), is to monitor those small seasonal-dependant displacements through DINSAR and persistent scatterer interferometric methods. The eastern paris basin is locally composed of outcropping Marne de Pantin and Argiles Vertes particularily sensible to swelling
IEEE International Geoscience and Remote Sensing Symposium, 2002
... ( ) ( ) ( i n n i m m i n n i m m i n n i m m n n m m i i n n m m i i n n m m Tyxn Tyxn Tyx T... more ... ( ) ( ) ( i n n i m m i n n i m m i n n i m m n n m m i i n n m m i i n n m m Tyxn Tyxn Tyx Tyx Tyx Tyx yx yx Tr Tb yxv yxvT Tyxyx ,, ,, , sin 4 , , 4 ,,,, − α α β β ε ε θ λ π λ π φ (1) ...
IGARSS 2001. Scanning the Present and Resolving the Future. Proceedings. IEEE 2001 International Geoscience and Remote Sensing Symposium (Cat. No.01CH37217), 2001
Subsidence monitoring of areas affected by low velocity displacements is an extremely useful appl... more Subsidence monitoring of areas affected by low velocity displacements is an extremely useful application of SAR (synthetic aperture radar) techniques. However, the required long time-baselines reduce the quality of the information stored in differential interferograms, adding difficulties to their processing. Typical characteristics of these interferograms are the presence of coherent areas that correspond to urban zones and totally incoherent areas
ABSTRACT Urban sites, particularly those with a differentiated relief characterized by more or le... more ABSTRACT Urban sites, particularly those with a differentiated relief characterized by more or less strong slopes, present usually ground deformations phenomena which might cause disorders and disturbances on constructions. This is the case of Butte Montmartre where Inspection Generale des Carrières of Ville de Paris register numerous small deformations affecting buildings specially in its southeastern part. It might be due to several geological, geotechnical, and hydrogeological processes such as landslides, compaction of manmade grounds and buried openpits, gypsum dissolution, technical quality of constructions, phreatic nappes variations. We applied herein radar differential and Persistent Scatterer interferometry to objectify, locate, characterize, quantify, and monitor those small movements. To do so, we processed and analyzed numerous images of European radar satellites (ERS 1 & 2, ENVISAT) available since 1992 up to present. At the same time, we analyzed and modeled the geological, geomorphological and hydrogeological contexts, and the consequences of past activities that changed the natural environment: water springs, sources catchment, gypsum extraction, urban development, drainage works and strengthening of sub-soil injections, etc. This multidisciplinary approach allow us to highlight and explain some of geological, hydrogeological and geotechnical factors causing these centimetric movements affecting Butte Montmartre buildings. Furthermore, our results will lead us to establish several geotechnical conceptual models defining more precisely the technical measures adapted to the Butte Montmartre mitigation.
2010 IEEE International Geoscience and Remote Sensing Symposium, 2010
The principal instrument of the SWOT (Surface Water and Ocean Topography) altimetry mission is Ka... more The principal instrument of the SWOT (Surface Water and Ocean Topography) altimetry mission is KaRIn, a Ka-band interferometric SAR system operating on near-nadir swaths on both sides of the satellite track. This article briefly describes the measurement principle, the processing steps and the specificities of the interferometric SAR data of KaRIn as compared to conventional spaceborne SAR systems.
2007 IEEE International Geoscience and Remote Sensing Symposium, 2007
The stable point network (SPN) is a persistent scatterer interferometric technique developed by A... more The stable point network (SPN) is a persistent scatterer interferometric technique developed by ALTAMIRA INFORMATION in 2001. The technique makes use of both ERS SAR and/or ASAR differential phase measurements to generate long term terrain movement and precise height maps with the same resolution as the original SAR images. The algorithm is capable to use all the available phase information
ABSTRACT The successful launch of TerraSAR-X has made high resolution Synthetic Aperture Radar im... more ABSTRACT The successful launch of TerraSAR-X has made high resolution Synthetic Aperture Radar images with a reduced temporal revisit time available. These new sensor characteristics influence the benefits of ground deformation estimation by means of advanced DInSAR techniques. This paper reviews the first experience in Persistent Scatterer Interferometry (PSI) processing, using a stack of TerraSAR-X Stripmap images. This processing was performed using the Stable Point Network (SPN) software. The selected test site is the city of Barcelona (Spain), showing different subsidence patterns due to underground works. Additionally, TerraSAR-X results show deformation profiles caused by thermal dilatation. The SPN software has been modified to detect and correct this type of signal, obtaining deformation profiles that are only related to ground movements. Finally, this paper presents a brief comparison of persistent scatterer density between ENVISAT and TerraSAR-X Stripmap data.
The island of Taiwan, where collision and mountain building occur, provides key examples for anal... more The island of Taiwan, where collision and mountain building occur, provides key examples for analyzing tectonic displacements through Interferometric methods. We apply both the D-InSAR and persistent scatterer SAR intereometry technique to monitor the active growing structure on the Tainan Tableland near the deformation front in SW Taiwan using ERS SAR images in the period of 1996-2000. Interferometric processing of
Recently Differential Interferometric Synthetic Aperture Radar (D-InSAR) technique applied in geo... more Recently Differential Interferometric Synthetic Aperture Radar (D-InSAR) technique applied in geosciences is considered as a powerful tool. The rapid and precise data provide us monitoring ground deformations continually. Thus the active orogeny of Taiwan provides key examples for analyzing tectonic displacements through Interferometric methods. The new Persistent Scatterers Interferometry method is herein applied in order to better understand deformations through
SAR Image Analysis, Modeling, and Techniques XIV, 2014
Advanced remote sensing techniques based on space-borne Synthetic Aperture Radar (SAR) have been ... more Advanced remote sensing techniques based on space-borne Synthetic Aperture Radar (SAR) have been developed during the last decade showing their applicability for the monitoring of surface displacements in landslide areas. This paper presents an advanced Persistent Scatterer Interferometry (PSI) processing based on the Stable Point Network (SPN) technique, developed by the company Altamira-Information, for the monitoring of an active slowmoving landslide in the mountainous environment of El Portalet, Central Spanish Pyrenees. For this purpose, two TerraSAR-X data sets acquired in ascending mode corresponding to the period from April to November 2011, and from August to November 2013, respectively, are employed. The objective of this work is twofold. On the one hand, the benefits of employing Nonlocal Interferomtric SAR (NL-InSAR) adaptive filtering techniques over vegetated scenarios to maximize the chances of detecting natural distributed scatterers, such as bare or rocky areas, and deterministic point-like scatterers, such as man-made structures or poles, is put forward. In this context, the final PSI displacement maps retrieved with the proposed filtering technique are compared in terms of pixels' density and quality with classical PSI, showing a significant improvement. On the other hand, since SAR systems are only sensitive to detect displacements in the line-of-sight (LOS) direction, the importance of projecting the PSI displacement results retrieved along the steepest gradient of the terrain slope is discussed. The improvements presented in this paper are particularly interesting in these type of applications since they clearly allow to better determine the extension and dynamics of complex landslide phenomena.
Remote Sensing for Agriculture, Ecosystems, and Hydrology XVI, 2014
Climate change challenges our understanding of risk by modifying hazards and their interactions. ... more Climate change challenges our understanding of risk by modifying hazards and their interactions. Sudden increases in population and rapid urbanization are changing exposure to risk around the globe, making impacts harder to predict. Despite the availability of operational mapping products, there is no single tool to integrate diverse data and products across hazards, update exposure data quickly and make scenario-based predictions to support both short and long-term risk-related decisions.
Swelling soils may induce small surface displacements under various climatic conditions, that may... more Swelling soils may induce small surface displacements under various climatic conditions, that may affect individual buildings. The aim of this work, funded by MAIF foundation (Insurance foundation), is to monitor those small seasonal-dependant displacements through DINSAR and persistent scatterer interferometric methods. The eastern paris basin is locally composed of outcropping Marne de Pantin and Argiles Vertes particularily sensible to swelling
IEEE International Geoscience and Remote Sensing Symposium, 2002
... ( ) ( ) ( i n n i m m i n n i m m i n n i m m n n m m i i n n m m i i n n m m Tyxn Tyxn Tyx T... more ... ( ) ( ) ( i n n i m m i n n i m m i n n i m m n n m m i i n n m m i i n n m m Tyxn Tyxn Tyx Tyx Tyx Tyx yx yx Tr Tb yxv yxvT Tyxyx ,, ,, , sin 4 , , 4 ,,,, − α α β β ε ε θ λ π λ π φ (1) ...
IGARSS 2001. Scanning the Present and Resolving the Future. Proceedings. IEEE 2001 International Geoscience and Remote Sensing Symposium (Cat. No.01CH37217), 2001
Subsidence monitoring of areas affected by low velocity displacements is an extremely useful appl... more Subsidence monitoring of areas affected by low velocity displacements is an extremely useful application of SAR (synthetic aperture radar) techniques. However, the required long time-baselines reduce the quality of the information stored in differential interferograms, adding difficulties to their processing. Typical characteristics of these interferograms are the presence of coherent areas that correspond to urban zones and totally incoherent areas
ABSTRACT Urban sites, particularly those with a differentiated relief characterized by more or le... more ABSTRACT Urban sites, particularly those with a differentiated relief characterized by more or less strong slopes, present usually ground deformations phenomena which might cause disorders and disturbances on constructions. This is the case of Butte Montmartre where Inspection Generale des Carrières of Ville de Paris register numerous small deformations affecting buildings specially in its southeastern part. It might be due to several geological, geotechnical, and hydrogeological processes such as landslides, compaction of manmade grounds and buried openpits, gypsum dissolution, technical quality of constructions, phreatic nappes variations. We applied herein radar differential and Persistent Scatterer interferometry to objectify, locate, characterize, quantify, and monitor those small movements. To do so, we processed and analyzed numerous images of European radar satellites (ERS 1 & 2, ENVISAT) available since 1992 up to present. At the same time, we analyzed and modeled the geological, geomorphological and hydrogeological contexts, and the consequences of past activities that changed the natural environment: water springs, sources catchment, gypsum extraction, urban development, drainage works and strengthening of sub-soil injections, etc. This multidisciplinary approach allow us to highlight and explain some of geological, hydrogeological and geotechnical factors causing these centimetric movements affecting Butte Montmartre buildings. Furthermore, our results will lead us to establish several geotechnical conceptual models defining more precisely the technical measures adapted to the Butte Montmartre mitigation.
2010 IEEE International Geoscience and Remote Sensing Symposium, 2010
The principal instrument of the SWOT (Surface Water and Ocean Topography) altimetry mission is Ka... more The principal instrument of the SWOT (Surface Water and Ocean Topography) altimetry mission is KaRIn, a Ka-band interferometric SAR system operating on near-nadir swaths on both sides of the satellite track. This article briefly describes the measurement principle, the processing steps and the specificities of the interferometric SAR data of KaRIn as compared to conventional spaceborne SAR systems.
2007 IEEE International Geoscience and Remote Sensing Symposium, 2007
The stable point network (SPN) is a persistent scatterer interferometric technique developed by A... more The stable point network (SPN) is a persistent scatterer interferometric technique developed by ALTAMIRA INFORMATION in 2001. The technique makes use of both ERS SAR and/or ASAR differential phase measurements to generate long term terrain movement and precise height maps with the same resolution as the original SAR images. The algorithm is capable to use all the available phase information
ABSTRACT The successful launch of TerraSAR-X has made high resolution Synthetic Aperture Radar im... more ABSTRACT The successful launch of TerraSAR-X has made high resolution Synthetic Aperture Radar images with a reduced temporal revisit time available. These new sensor characteristics influence the benefits of ground deformation estimation by means of advanced DInSAR techniques. This paper reviews the first experience in Persistent Scatterer Interferometry (PSI) processing, using a stack of TerraSAR-X Stripmap images. This processing was performed using the Stable Point Network (SPN) software. The selected test site is the city of Barcelona (Spain), showing different subsidence patterns due to underground works. Additionally, TerraSAR-X results show deformation profiles caused by thermal dilatation. The SPN software has been modified to detect and correct this type of signal, obtaining deformation profiles that are only related to ground movements. Finally, this paper presents a brief comparison of persistent scatterer density between ENVISAT and TerraSAR-X Stripmap data.
The island of Taiwan, where collision and mountain building occur, provides key examples for anal... more The island of Taiwan, where collision and mountain building occur, provides key examples for analyzing tectonic displacements through Interferometric methods. We apply both the D-InSAR and persistent scatterer SAR intereometry technique to monitor the active growing structure on the Tainan Tableland near the deformation front in SW Taiwan using ERS SAR images in the period of 1996-2000. Interferometric processing of
Recently Differential Interferometric Synthetic Aperture Radar (D-InSAR) technique applied in geo... more Recently Differential Interferometric Synthetic Aperture Radar (D-InSAR) technique applied in geosciences is considered as a powerful tool. The rapid and precise data provide us monitoring ground deformations continually. Thus the active orogeny of Taiwan provides key examples for analyzing tectonic displacements through Interferometric methods. The new Persistent Scatterers Interferometry method is herein applied in order to better understand deformations through
SAR Image Analysis, Modeling, and Techniques XIV, 2014
Advanced remote sensing techniques based on space-borne Synthetic Aperture Radar (SAR) have been ... more Advanced remote sensing techniques based on space-borne Synthetic Aperture Radar (SAR) have been developed during the last decade showing their applicability for the monitoring of surface displacements in landslide areas. This paper presents an advanced Persistent Scatterer Interferometry (PSI) processing based on the Stable Point Network (SPN) technique, developed by the company Altamira-Information, for the monitoring of an active slowmoving landslide in the mountainous environment of El Portalet, Central Spanish Pyrenees. For this purpose, two TerraSAR-X data sets acquired in ascending mode corresponding to the period from April to November 2011, and from August to November 2013, respectively, are employed. The objective of this work is twofold. On the one hand, the benefits of employing Nonlocal Interferomtric SAR (NL-InSAR) adaptive filtering techniques over vegetated scenarios to maximize the chances of detecting natural distributed scatterers, such as bare or rocky areas, and deterministic point-like scatterers, such as man-made structures or poles, is put forward. In this context, the final PSI displacement maps retrieved with the proposed filtering technique are compared in terms of pixels' density and quality with classical PSI, showing a significant improvement. On the other hand, since SAR systems are only sensitive to detect displacements in the line-of-sight (LOS) direction, the importance of projecting the PSI displacement results retrieved along the steepest gradient of the terrain slope is discussed. The improvements presented in this paper are particularly interesting in these type of applications since they clearly allow to better determine the extension and dynamics of complex landslide phenomena.
Remote Sensing for Agriculture, Ecosystems, and Hydrology XVI, 2014
Climate change challenges our understanding of risk by modifying hazards and their interactions. ... more Climate change challenges our understanding of risk by modifying hazards and their interactions. Sudden increases in population and rapid urbanization are changing exposure to risk around the globe, making impacts harder to predict. Despite the availability of operational mapping products, there is no single tool to integrate diverse data and products across hazards, update exposure data quickly and make scenario-based predictions to support both short and long-term risk-related decisions.
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Papers by J. Duro