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Seismic-zonation of Port-au-Prince Using Pixel- and Object-based Imaging Analysis Methods on ASTER GDEM
- Yong, Alan, Hough, Susan E., Cox, Brady R., Rathje, Ellen M., Bachhuber, Jeff, Dulberg, Ranon, Hulslander, David, Christiansen, Lisa, Abrams, Michael J.
- Photogrammetric engineering and remote sensing 2011 v.77 no.9 pp. 909-921
- Advanced Spaceborne Thermal Emission and Reflection Radiometer, geophysics, image analysis, mountains, remote sensing, topography, Haiti
- <p><i>We report about a preliminary study to evaluate the use of semi-automated imaging analysis of remotely-sensed DEM and field geophysical measurements to develop a seismic-zonation map of Port-au-Prince, Haiti. For in situ data, V<sub>s</sub>30 values are derived from the MASW technique deployed in and around the city. For satellite imagery, we use an ASTER GDEM of Hispaniola. We apply both pixel- and object-based imaging methods on the ASTER GDEM to explore local topography (absolute elevation values) and classify terrain types such as mountains, alluvial fans and basins/near-shore regions. We assign NEHRP seismic site class ranges based on available V<sub>s</sub>30 values. A comparison of results from imagery-based methods to results from traditional geologic-based approaches reveals good overall correspondence. We conclude that image analysis of RS data provides reliable first-order site characterization results in the absence of local data and can be useful to refine detailed site maps with sparse local data.</i></p>