Robert E. Crippen, Ph.D. NASA Jet Propulsion Laboratory California Institute of Technology Pasadena, California USA Geotechnical Engineering Earthquake Reconnaissance: Use of Remote Sensing
Wavelengths: * Visible Light & Reflectance Infrared * Radar Platforms: * Spaceborne * Airborne REMOTE SENSING
Using Radar Imagery: * Backscatter Images * Change Detection * Interferometry * Polarimetry Some Sensors: ERS/ENVISAT, Radarsat, Airborne Using Visible & Reflectance Infrared: * Post-Quake-Image Direct Recognition * Change Detection (Pre-vs-Post Imagery) * Visual * Computational * Imaging Spectroscopy Some Sensors: Quickbird, Ikonos, Aerial TECHNIQUES
DIGITAL PROCESSING Correlation Images (Damage creates low) Difference Images (Damage creates high) Complex Coherence (Radar) Edge Enhancements (Movements vs Reflectance) Texture measurements: Temporal & Spatial Changes Calibration / Normalization Vegetation Masking
Bam Earthquake, Iran December 26, 2003 Citadel BeforeAfter
Bam Earthquake, Iran Citadel BeforeAfter Quickbird Satellite
Bam Earthquake, Iran December 26, 2003 BeforeAfter Quickbird Satellite
September 30, 2003January 3, 2004 University of California at Irvine (UCI) and the Earthquake Engineering Research Institute (EERI)
ImageCat Inc. and Chiba University Quickbird satellite imagery of Boumerdes, Algeria. Acquired before and after the May 21st 2003 earthquake. Images courtesy of DigitalGlobe.
Ikonos Satellite Image (1 meter): Tokyo
Ikonos Satellite Image (1 meter): Manhattan, NY
LIDAR Fault Detection Near Seattle
LIDAR: Petronas Towers, Malaysia Image interpretation, change detection, pancaking issue
Landers Earthquake Fault Break Observation SPOT Image: 10 meters Ikonos Image: 1 meter (Aerial Photo Simulation) “Follow the Trace”
Radar Imaging Effects of Quake Damage on Radar Backscatter Weakened Signal ReturnStrengthened Signal Return From: Matsuoka & Yamazaki, IGARSS 2004
Hector Mine Earthquake SAR Interferometry 16 October 1999 Gilles Peltzer, Frédéric Crampé, and Paul Rosen JPL
JERS-1 interferometric image of the Kobe, Japan area following the 1995 earthquake, depicting surface deformation. ( JPL, GSI and NASDA)
AVIRIS: Mapping Hotspots Environmental Studies of the World Trade Center area after the September 11, 2001 attack. U. S. Geological Survey, Open File Report OFR
Airborne Visible & Infrared Imaging Spectrometer (AVIRIS) Mapping Asbestos
PROBLEMS / CONSIDERATIONS Clouds / Smoke / Darkness: Radar advantage Resolution: Visible / NIR advantage Acquisition Speeds: Utility and Clean-Ups Archive Availability Acquisitions before quake (any at all?) Acquisitions that match… Non-Quake Differences: Seasons: vegetation and shadows Viewing geometry (distortions & hidden areas) Construction & non-quake demolition