IGARSS 2011_AHMED GABER.ppt

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IGARSS 2011_AHMED GABER.ppt

  1. 1. ASSESSING THE POTENTIAL OF GROUNDWATER RESOURCES WEST OF ASWAN, EGYPT, USING ALOS/PALSAR POLARIMETRIC INFORMATION Ahmed Gaber ( أحمد جابر ) *, Magaly Koch **, Motoyuki Sato * * Center for Northeast Asian Studies, Tohoku University, Sendai, Japan **Center for Remote Sensing, Boston University, Boston, MA, USA IGARSS 2011, 24-29 July, Vancouver, Canada [email_address]
  2. 2. Talk Outline <ul><li>Research Background </li></ul><ul><li>Radar Polarization Transformation of ALOS/PALSAR </li></ul><ul><li>Radar Polarization Filtering </li></ul><ul><li>Preliminary results </li></ul><ul><li>Field Validation </li></ul><ul><li>Conclusion </li></ul>IGARSS 2011, 24-29 July, Vancouver, Canada
  3. 3. © Freeman et. al., 2007 Radar Penetration Capability in the Desert Areas Research Background IGARSS 2011, 24-29 July, Vancouver, Canada
  4. 4. IGARSS 2011, 24-29 July, Vancouver, Canada Research Background © Freeman et. al., 2007
  5. 5. <ul><li>The penetration capability is based up on both the observational conditions (sensor) and the medium characteristics (environmental conditions) , such; </li></ul><ul><li>The penetration depth is spatially dependent </li></ul>Research Background IGARSS 2011, 24-29 July, Vancouver, Canada Environmental conditions Surface roughness Moisture content Dielectric constant grain size sand contaminants Bulk density Observational conditions Wavelength Polarization Incident angle
  6. 6. Objective <ul><li>Evaluate the use of ALOS/PALSAR full polarimetric data to delineate and image the near surface structures in the desert environment west the Nile River in Egypt. </li></ul>IGARSS 2011, 24-29 July, Vancouver, Canada
  7. 7. Description of the Test Site IGARSS 2011, 24-29 July, Vancouver, Canada ALOS/AVNIR-2 Barqa Hill Nile River
  8. 8. Radar Polarization Transformation of ALOS/PALSAR IGARSS 2011, 24-29 July, Vancouver, Canada © E. Pottier – J.S. Lee (2011)
  9. 9. Radar Polarization Transformation of ALOS/PALSAR IGARSS 2011, 24-29 July, Vancouver, Canada © E. Pottier – J.S. Lee (2011)
  10. 10. Radar Polarization Transformation of ALOS/PALSAR Orientation angle : ψ˚ Elipticity angle:   χ˚ ALOS/PALSAR (HH, HV, VH, VV) IGARSS 2011, 24-29 July, Vancouver, Canada |SLL-SRR| |SLR+SRL| |SLL+SRR| |SHH-SVV| |SHV+SVH| |SHH+SVV| |S11-S22| |S12+S21| |S11+S22| |S11-S22| |S12+S21| |S11+S22| Linear Basis ( ψ =45° &   χ =0°) Elliptical Basis ( ψ =45° &   χ =23°) Circular Basis ( ψ =0° &   χ =45°) Elliptical Basis ( ψ =135° &   χ =34°) |S11-S22| |S12+S21| |S11+S22| Elliptical Basis ( ψ =45° &   χ =11°) |S11-S22| |S12+S21| |S11+S22|
  11. 11. Radar Polarization Transformation of ALOS/PALSAR Orientation angle : ψ˚ Elipticity angle:   χ˚ ALOS/PALSAR (HH, HV, VH, VV) AVNIR-2 IGARSS 2011, 24-29 July, Vancouver, Canada
  12. 12. Radar Polarization Filtering Optimal Polarization Contrast Enhancement (O.P.C.E) method (Kostinski, and Boerner, 1987) IGARSS 2011, 24-29 July, Vancouver, Canada Buried fractures Surrounding the fractures
  13. 13. Radar Polarization Filtering The Proper Polarization State of Buried Fracture Imaging iteration = 8 Final Contrast = 2.153422e+000 Optimal Transmit Polarization g0 = 1.000000e+000 g1 = 9.928611e-001 g2 = 1.098681e-002 g3 = 1.187688e-001 Optimal Receive Polarization h0 = 1.000000e+000 h1 = -9.832537e-001 h2 = -1.133955e-001 h3 = 1.426660e-001 Initial Contrast = 1.047321e+000 Buried fractures (S vv ) and surrounding (S hh ) IGARSS 2011, 24-29 July, Vancouver, Canada
  14. 14. Radar Polarization Filtering Polarization filtering effect: (a) before, and (b) after applying the O.P.C.E IGARSS 2011, 24-29 July, Vancouver, Canada
  15. 15. Preliminary results (a) ALOS/AVNIR-2, and (b) ALOS/PALSAR processed image 10 km 10 km (a) (b) IGARSS 2011, 24-29 July, Vancouver, Canada Ephemeral river Ephemeral river Barqa Hill Barqa Hill
  16. 16. Field Validation Very dry soil moisture with values 0%, 0.3%, 0.6% and the maximum value is 1.7% <ul><li>Measuring the soil volumetric moisture using (TDR) </li></ul>IGARSS 2011, 24-29 July, Vancouver, Canada
  17. 17. Field Validation ε r = 3.04 The low moisture content and low RMS height are providing good conditions for RADAR to penetrate relatively deep The average h RMS = 0.01 cm IGARSS 2011, 24-29 July, Vancouver, Canada Soil moisture with values 0%, 0.3%, 0.6% and the maximum value is 1.7%
  18. 18. Field Validation <ul><li>Acquiring GPR survey using 270 MHz shielded antenna </li></ul>21 GPR profiles were surveyed IGARSS 2011, 24-29 July, Vancouver, Canada
  19. 19. IGARSS 2011, 24-29 July, Vancouver, Canada ALOS/PALSAR A A ’ B B ’ C C ’
  20. 20. Application point of view Extracted faults from (a) official geologic map, (b) processed ALOS/PALSAR data and (c) density map of highly fractured areas (brown color) IGARSS 2011, 24-29 July, Vancouver, Canada
  21. 21. Application point of view SRTM-DEM, drainage patterns and watersheds surrounding Kom Umbo basin IGARSS 2011, 24-29 July, Vancouver, Canada
  22. 22. Conclusion <ul><li>Circular polarization information of PALSAR L-band data has been used in this study to detect hidden fault structures striking in various directions. </li></ul><ul><li>The Optimal Polarization Contrast Enhancement (O.P.C.E) method which maximizes the ratio of backscattered strength between faults (targets) and the surrounding sedimentary material (clutter) clearly defined the fault zones. </li></ul><ul><li>Faults that are largely undetectable on optical images or on the ground were detected on satellite radar images and confirmed with GPR. </li></ul><ul><li>These highly fractured zones are possibly favorable zones for groundwater accumulation. </li></ul>IGARSS 2011, 24-29 July, Vancouver, Canada
  23. 23. IGARSS 2011, 24-29 July, Vancouver, Canada
  24. 24.
  25. 25. IGARSS 2011 24-29 July, Vancouver, Canada Field Photographs;
  26. 26. IGARSS 2011 24-29 July, Vancouver, Canada Field Validation 2) Measuring the surface roughness using the Pinemeter The average h RMS was 0.01 cm across all sites, with a maximum of 0.2 cm (almost flat)
  27. 27. Hill shaded relief image has been generated from the SRTM Kom Umbo
  28. 28. Geologic map of Aswan (2005)

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