Detection of Ice-Jam Floods Using PALSAR Full-Polarimetry Data
Detection of Ice-Jam Floods Using PALSAR Full-Polarimetry Data
复制标题
使用 PALSAR 全偏振数据检测冰塞洪水
DOI：
10.1007/978-981-10-4648-3_5
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
M. Shimada
中科院分区：
文献类型：
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作者：
Manabu Watanabe;H. Takakura;C. Yonezawa;Y. Yoshikawa;M. Shimada
位于俄罗斯与北冰洋交汇处的勒拿河在春季经常发生由冰堵塞引起的洪水。在这种情况下，低纬度地区发生融雪，高纬度地区河水结冰。融雪被冰冻的河水阻挡，每年都会引发冰塞洪水。利用相控阵型l波段合成孔径雷达（PALSAR）获得的全极化参数，确定了最适合探测冰封洪水的参数。计算了具有代表性的全极化参数，包括σ0、熵/α/各向异性、四组分分解模型和相干性。PALSAR的马赛克图像帮助确定了2007年5月18日在Ytyk Kiuel和2007年7月15日在berdigakh的两次大规模洪水。当地报纸上发表的文章和光学传感器图像证实了这些洪水事件。通过极化相干性γ(HH + VV)−(HH−VV)的差值，推导出了考虑和不考虑驱油的最佳探测区域。总准确率为92.9%，用户和生产者对洪水区域的检测准确率分别为53.5%和72.8%。四分量分解分析表明，γ(HH + VV)−(HH−VV)的洪水探测方法适用于低海拔植被区和城市地区。
The Lena River in Russia at its intersection with the Arctic Ocean is subject to spring floods such as those caused by ice jams. In such cases, snowmelt occurs at lower latitudes and river water freezes at higher latitudes. That snowmelt is blocked by the frozen river water, which induces ice-jam floods every year. Full-polarimetric parameters obtained from the Phased Array Type L-band Synthetic Aperture Radar (PALSAR) were used to determine the most suitable ones for detecting ice-jam floods. Representative full-polarimetric parameters were calculated, including σ0, entropy/α/anisotropy, the four-component decomposition model, and coherence. The PALSAR mosaic image helped to identify two large-scale floods, at Ytyk Kiuel on May 18, 2007, and at Berdigestiakh on July 15, 2007. These flood events were confirmed by articles published in the local newspaper and by optical sensor images. The optimum detectability for the flooding area was derived by the difference of polarimetric coherence, γ(HH + VV) − (HH − VV), obtained with and without the consideration of flooding. Total accuracy was 92.9%, and user and producer accuracies for detection of the flooded areas were 53.5% and 72.8%, respectively. The four-component decomposition analysis indicated that flood detection using γ(HH + VV) − (HH − VV)is applicable to low-height vegetation areas and urban regions.