Applying PSI and Tomographic techniques using Radarsat-2 Spotlight data: a case study for Edmonton area Valentin Poncos (1...
Outline <ul><li>DESCRIPTION OF THE GEOLOGICAL LAYOUT </li></ul><ul><li>ANALYSIS OF THE DEFORMATION RESULTS AT LOW RESOLUTI...
Geological hazards in Alberta
Geological setting
Location <ul><li>Edmonton’s River valley is inherently unstable due to the action of North Saskatchewan River and very wea...
Landslides in Edmonton
Coal mining in Edmonton
<ul><li>17  TerraSAR-X acquisitions over the city of Edmonton, Alberta (CANADA)  </li></ul><ul><li>(from 2008. 05. 10  to ...
TERRASAR-X STRIPMAP FRAME
Distribution of the Acquisitions <ul><li>17 Stripmap acquisition from May to November, 2009 </li></ul><ul><li>Maximun base...
DATA ANALYSIS BLOCK DIAGRAM ZERO BASELINE STEERING DEM INTERFEROGRAM STACKING ANALYSIS APD AND DEFORMATION ESTIMATION ATMO...
Tomographic imaging: 3D By synthesizing an antenna also in the slant height direction orthogonal to the line of sight we a...
4D SAR Imaging (Differential SAR Tomography) N acquisitions with spatial baseline distribution  and temporal distribution ...
LOW RESOLUTION DEFORMATION RESULTS
LOW RESOLUTION DEFORMATION RESULTS
LOW RESOLUTION DEFORMATION RESULTS
FULL RESOLUTION (TOMOGRAPHIC) RESULTS  (Dominant scatterers)
TOMOGRAPHIC RESULTS (Dominant Scatterer)
THE LAYOVER EFFECT OVER BUILDINGS ROOF FACADE GROUND FACADE GROUND
Multiple Targets Analysis in Layover Area azimuth   range
Estimated Residual Topography Single Scatterers Lower Double Scatterers Higher Double Scatterers Multiple Targets Analysis...
Single and double scatterers analysis in layover Area Tomographic SAR imaging is able to resolve the interference due to m...
Analysis in Layover Area Detected Single Scatterers Estimated Residual Topography azimuth   range  -100 +100 m
Estimated Residual Topography Single Scatterers Lower Double Scatterers Higher Double Scatterers <ul><li>but …. </li></ul>...
Results of the Wednesday presentation with spotlight TSX data -100m 100m Amplitude image RECONSTRUCTED TOPOGRAPHY Single s...
Results of the Wednesday presentation on TSX spotlight data
Comparison between the Edmonton and Las Vegas datasets  Edmonton Number of images: 17 Imaging Mode: Stripmap Azimuth resol...
Estimated Residual Topography Single Scatterers Single + Lower Double Scatterers Single + Higher Double Scatterers Multipl...
Multiple Targets Analysis in Layover Area Detected Double Scatterers Estimated Residual Topography - 100 +100 m Single Sca...
Conclusions <ul><li>We have carried out an analysis of a TSX data stack over the Edmonton area (Alberta-Canada). </li></ul...
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FR2.L09 - PROCESSING OF MEMPHIS MILLIMETER WAVE MULTI-BASELINE INSAR DATA

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  • The Alberta province, in western Canada, is widely affected by natural and human-induced hazards, such as landslides or soil expansion and subsidence related to human activities (as oil extraction), that can cause severe damage to buildings and infrastructures.
  • Finally, surface deformation damaging buildings widely occur in the urban area due to differential swelling of clays, that are particularly susceptible to water content changes
  • In particular, the city of Edmonton, localized in the North Saskatchewan valley, is mainly interested by
  • by slope movements along the riverbanks
  • and subsidence associated to urban development and coal mines. Seams of coal were, in fact, extensively exploited until 1970. Subsequently, the abandoned mines, extended under both downtown and residential areas, caused collapses over the past few decades, bringing the Local Authorities to carry out mitigation measures.
  • FR2.L09 - PROCESSING OF MEMPHIS MILLIMETER WAVE MULTI-BASELINE INSAR DATA

    1. 1. Applying PSI and Tomographic techniques using Radarsat-2 Spotlight data: a case study for Edmonton area Valentin Poncos (1) , John Dehls (2) , Gianfranco Fornaro (3) , Diego Reale (3) (1) University of Calgary, Alberta, Canada (2) Alberta Geological Survey, Edmonton, Canada (3) Institute for Electromagnetic Sensing of the Environment (IREA) – National Research Council (CNR), Naples, Italy Applying Tomographic techniques using TerraSAR-X stripmap data: a case study for Edmonton area
    2. 2. Outline <ul><li>DESCRIPTION OF THE GEOLOGICAL LAYOUT </li></ul><ul><li>ANALYSIS OF THE DEFORMATION RESULTS AT LOW RESOLUTION </li></ul><ul><li>FULL RESOLUTION DEFORMATION RESULTS ANALISYS </li></ul><ul><li>ANALYSIS ON THE SEPARATION OF SCATTERERS ON BUILDINGS </li></ul><ul><li>CONCLUSIONS </li></ul>
    3. 3. Geological hazards in Alberta
    4. 4. Geological setting
    5. 5. Location <ul><li>Edmonton’s River valley is inherently unstable due to the action of North Saskatchewan River and very weak clay layers. </li></ul><ul><li>Coal mining from 1870’s to 1970 lead to further destabilization. </li></ul><ul><li>River bank collapse and subsidence are significant hazards today. </li></ul>
    6. 6. Landslides in Edmonton
    7. 7. Coal mining in Edmonton
    8. 8. <ul><li>17 TerraSAR-X acquisitions over the city of Edmonton, Alberta (CANADA) </li></ul><ul><li>(from 2008. 05. 10 to 2008. 11. 13) </li></ul><ul><li>Imaging Mode: Single Polarization Stripmap </li></ul><ul><li>Orbit Direction: Ascending </li></ul><ul><li>Beam Identification: strip_014 </li></ul><ul><li>Orbit Number: 10551 </li></ul><ul><li>Incidence Angle:  44 ° </li></ul><ul><li>Look Direction: Right </li></ul><ul><li>Azimuth resolution:  3.3 meters </li></ul><ul><li>Slant Range resolution:  1.8 meters </li></ul><ul><li>Polarisation: VV </li></ul>THE TERRASAR-X DATA SET OVER EDMONTON
    9. 9. TERRASAR-X STRIPMAP FRAME
    10. 10. Distribution of the Acquisitions <ul><li>17 Stripmap acquisition from May to November, 2009 </li></ul><ul><li>Maximun baseline excursion of about 380m </li></ul>
    11. 11. DATA ANALYSIS BLOCK DIAGRAM ZERO BASELINE STEERING DEM INTERFEROGRAM STACKING ANALYSIS APD AND DEFORMATION ESTIMATION ATMOSPHERIC AND DEFORMATION REMOVAL TOMOGRAPHIC FULL RESOLUTION ANALYSIS Registered SLC Stack LOW RESOLUTION DEFORMATION PRODUCT SINGLE SCATTERERS PRODUCT DOUBLE SCATTERERS PRODUCt
    12. 12. Tomographic imaging: 3D By synthesizing an antenna also in the slant height direction orthogonal to the line of sight we are able to analyze the vertical structure of the scattering thus extending SAR imaging form 2D (azimuth-slant range) to 3D (azimuth-slant range-slant height) los Slant height Scattering profile
    13. 13. 4D SAR Imaging (Differential SAR Tomography) N acquisitions with spatial baseline distribution and temporal distribution F. Lombardini, “Differential Tomography: a New Framework for SAR Interferometry “, IEEE Trans. Geosci. Remote Sens., 43, pp. 37-44, 2005. G. Fornaro, D. Reale, F. Serafino, &quot;Four-Dimensional SAR Imaging for Height Estimation and Monitoring of Single and Double Scatterers&quot;, IEEE Trans. Geosci. Remote Sens., Jan. 2009, vol. 47 (1), 224-237 ground range range elevation Satellite passes
    14. 14. LOW RESOLUTION DEFORMATION RESULTS
    15. 15. LOW RESOLUTION DEFORMATION RESULTS
    16. 16. LOW RESOLUTION DEFORMATION RESULTS
    17. 17. FULL RESOLUTION (TOMOGRAPHIC) RESULTS (Dominant scatterers)
    18. 18. TOMOGRAPHIC RESULTS (Dominant Scatterer)
    19. 19. THE LAYOVER EFFECT OVER BUILDINGS ROOF FACADE GROUND FACADE GROUND
    20. 20. Multiple Targets Analysis in Layover Area azimuth range
    21. 21. Estimated Residual Topography Single Scatterers Lower Double Scatterers Higher Double Scatterers Multiple Targets Analysis in Layover Area Detected Single Scatterers -100 +100 m azimuth range
    22. 22. Single and double scatterers analysis in layover Area Tomographic SAR imaging is able to resolve the interference due to multiple contribution inside the same azimuth/range pixel This interference typically occurs in urban areas where, because of the layover effect, the buildings are folded down to the ground. azimuth range
    23. 23. Analysis in Layover Area Detected Single Scatterers Estimated Residual Topography azimuth range -100 +100 m
    24. 24. Estimated Residual Topography Single Scatterers Lower Double Scatterers Higher Double Scatterers <ul><li>but …. </li></ul><ul><li>Only 17 acquisitions </li></ul><ul><li>Limited orbital tube </li></ul><ul><li>Large incidence angle (  44°) </li></ul>Multiple Targets Analysis in Layover Area -100 +100 m
    25. 25. Results of the Wednesday presentation with spotlight TSX data -100m 100m Amplitude image RECONSTRUCTED TOPOGRAPHY Single scatterers Double scatterers: bottom Double scatterers: upper
    26. 26. Results of the Wednesday presentation on TSX spotlight data
    27. 27. Comparison between the Edmonton and Las Vegas datasets Edmonton Number of images: 17 Imaging Mode: Stripmap Azimuth resolution:  3.3m Slant Range resolution:  1.8m Incidence Angle:  44 ° Las Vegas Number of images: 25 Imaging Mode: HRes Spotlight Azimuth resolution:  1.1m Slant Range resolution:  0.6m Incidence Angle:  36 ° slant range slant range
    28. 28. Estimated Residual Topography Single Scatterers Single + Lower Double Scatterers Single + Higher Double Scatterers Multiple Targets Analysis in Layover Area -100 +100 m
    29. 29. Multiple Targets Analysis in Layover Area Detected Double Scatterers Estimated Residual Topography - 100 +100 m Single Scatterers Single + Lower Double Scatterers Single + Higher Double Scatterers
    30. 30. Conclusions <ul><li>We have carried out an analysis of a TSX data stack over the Edmonton area (Alberta-Canada). </li></ul><ul><li>From the monitoring viewpoint the results show the possibility to achieve a monitoring of the deformations associated with the presence of past coal seams and with the clay expansion/compaction of clays in the residential areas. </li></ul><ul><li>Higher order analysis for the separation contributions in the Edmonton downtown areas has shown limitations which should be ascribed to the limited number of passes, to the large incidence angle. Large differences of the performances for layover separation wrt to the spotlight results achieved over another areas seem also to be associated with the acquisition mode (stripmap) </li></ul><ul><li>FUTURE ACTIVITIES </li></ul><ul><li>A deeper interpretation of the results wrt the clay swelling is needed </li></ul><ul><li>Processing of more data-stacks, particular spotlights data from TSX and RADARSAT is necessary to further investigate the potentials of the tomographic technique for layover separation at X and C bands. </li></ul>THANK YOU

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