Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XL-3/W2, 281-288, 2015
http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XL-3-W2/281/2015/
doi:10.5194/isprsarchives-XL-3-W2-281-2015
© Author(s) 2015. This work is distributed
under the Creative Commons Attribution 3.0 License.
 
10 Mar 2015
RAPID DISASTER ANALYSIS BASED ON SAR TECHNIQUES
C. H. Yang and U. Soergel Technische Universität Darmstadt, Institute of Geodesy, Germany
Keywords: Disaster Analysis, SAR, Change Detection, Curvelet Filtering, Morphological Approach Abstract. Due to all-day and all-weather capability spaceborne SAR is a valuable means for rapid mapping during and after disaster. In this paper, three change detection techniques based on SAR data are discussed: (1) initial coarse change detection, (2) flooded area detection, and (3) linear-feature change detection. The 2011 Tohoku Earthquake and Tsunami is used as case study, where earthquake and tsunami events provide a complex case for this study. In (1), pre- and post-event TerraSAR-X images are coregistered accurately to produce a false-color image. Such image provides a quick and rough overview of potential changes, which is useful for initial decision making and identifies areas worthwhile to be analysed further in more depth. In (2), the post-event TerraSAR-X image is used to extract the flooded area by morphological approaches. In (3), we are interested in detecting changes of linear shape as indicator for modified man-made objects. Morphological approaches, e.g. thresholding, simply extract pixel-based changes in the difference image. However, in this manner many irrelevant changes are highlighted, too (e.g., farming activity, speckle). In this study, Curvelet filtering is applied in the difference image not only to suppress false alarms but also to enhance the change signals of linear-feature form (e.g. buildings) in settlements. Afterwards, thresholding is conducted to extract linear-shaped changed areas. These three techniques mentioned above are designed to be simple and applicable in timely disaster analysis. They are all validated by comparing with the change map produced by Center for Satellite Based Crisis Information, DLR.
Conference paper (PDF, 3749 KB)


Citation: Yang, C. H. and Soergel, U.: RAPID DISASTER ANALYSIS BASED ON SAR TECHNIQUES, Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XL-3/W2, 281-288, doi:10.5194/isprsarchives-XL-3-W2-281-2015, 2015.

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