Properties of X-, C- and L-band repeat-pass interferometric SAR coherence in Mediterranean pine forests affected by fires.
Properties of X-, C- and L-band repeat-pass interferometric SAR coherence in Mediterranean pine forests affected by fires.
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DOI：
10.1016/j.rse.2010.04.021
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发表时间：
2010-10
影响因子：
13.5
通讯作者：
M. Tanase;M. Santoro;U. Wegmüller;J. Riva;F. Pérez-Cabello
中科院分区：
文献类型：
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作者：
M. Tanase;M. Santoro;U. Wegmüller;J. Riva;F. Pérez-Cabello
合成孔径雷达（SAR）的数据进行了研究，以确定烧伤的严重程度和干涉相干性之间的关系，在三个网站受森林火灾的丘陵地中海环境。可从TerraSAR-X、ERS-1/2、Envisat ASAR和ALOS PALSAR传感器获得重复通过合成孔径雷达图像。一致性有关的烧伤严重程度（复合烧伤指数）和遥感估计表示的差异归一化烧伤率（dNBR）指数的测量。此外，地形和天气对相干估计的影响进行了评估。在一定的入射角范围内，X波段和C波段的共偏振相干性随烧伤严重程度的增加而增加，而交叉偏振相干性对烧伤严重程度几乎不敏感。更高的敏感性，烧伤的严重程度，发现在L波段的共同和交叉极化通道。连贯性和烧伤严重程度之间的关联强度是最强的稳定，干燥的环境条件下获得的图像。当考虑局部入射角时，X和C波段的决定系数从0.6增加到0.9。在L波段，局部入射角对与烧伤严重程度的关联强度影响较小。
Synthetic Aperture Radar (SAR) data has been investigated to determine the relationship between burn severity and interferometric coherence at three sites affected by forest fires in a hilly Mediterranean environment. Repeat-pass SAR images were available from the TerraSAR-X, ERS-1/2, Envisat ASAR and ALOS PALSAR sensors. Coherence was related to measurements of burn severity (Composite Burn Index) and remote sensing estimates expressed by the differenced normalized burn ratio (dNBR) index. In addition, the effects of topography and weather on coherence estimates were assessed. The analysis for a given range of local incidence angle showed that the co-polarized coherence increases with the increase of burn severity at X- and C-band whereas cross-polarized coherence was practically insensitive to burn severity. Higher sensitivity to burn severity was found at L-band for both co- and cross-polarized channels. The association strength between coherence and burn severity was strongest for images acquired under stable, dry environmental conditions. When the local incidence angle is accounted for the determination coefficients increased from 0.6 to 0.9 for X- and C-band. At L-band the local incidence angle had less influence on the association strength to burn severity.