撮影方向の異なる高分解能SAR画像を用いた建物被害の検出精度の向上に関する研究  [in Japanese] Accuracy Improvement of Building Damage Detection Using High-Resolution SAR Images Observed from Different Directions  [in Japanese]

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Abstract

高分解能SAR画像による建物被害の検出精度の向上を目指して, 2010年ハイチ地震の被災地を対象として, 撮影方向が異なる2ペアの地震前後のSAR画像を用いて, 個々の建物の倒壊の有無を判別する解析を行った.まず, 撮影方向がほぼ同一の1ペアの画像と建物フットプリントデータを用いて, 地震前後の強度差分値と相関係数に基づく線形判別解析から, それぞれの検出精度を比較したところ, 画像の撮影方向と建物の立地方向の関係によって精度が変化することを明らかにした.さらに, 2ペアの画像を用いた判別解析を行い, 1ペアの画像解析に比べて検出精度がやや向上することを示した.

The effect of observation direction on building damage detection from high-resolution SAR images is discussed by using two pairs of TerraSAR-X images and building damage data in the area damaged by the 2010 Haiti earthquake in order to improve the detection accuracy. The ascending pair and the descending pair of the images observed before and after the earthquake are analyzed. Linear discrimination analysis is applied to the pairs of the images in order to identify the collapsed buildings. The result shows that the accuracy of the damage detection depends on the relation between the observation direction and the building direction. The analysis based on the two pairs of the images achieves higher accuracy than the analysis based on a pair of the images.

Journal

  • Journal of Japan Association for Earthquake Engineering

    Journal of Japan Association for Earthquake Engineering 15(7), 7_390-7_403, 2015

    JAPAN ASSOCIATION FOR EARTHQUAKE ENGINEERING

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