Polarimetric Parameters for Growing Stock Volume Estimation Using ALOS PALSAR L-Band Data over Siberian Forests
Polarimetric Parameters for Growing Stock Volume Estimation Using ALOS PALSAR L-Band Data over Siberian Forests
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DOI：
10.3390/rs5115725
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发表时间：
2013-11
期刊：
影响因子：
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通讯作者：
T. Chowdhury;C. Thiel;C. Schmullius;M. Stelmaszczuk-Górska
中科院分区：
文献类型：
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作者：
T. Chowdhury;C. Thiel;C. Schmullius;M. Stelmaszczuk-Górska
为了评估ALOS L波段全极化雷达数据在林业应用中的潜力，我们研究了一种描述西伯利亚森林极化响应的四分量分解方法。将相干矩阵旋转前后的表面散射、双反射和体积散射的分解能力与生长量进行了比较。为了补偿地形效应，完成了相干矩阵的自适应旋转。旋转后，GSV与双跳的相关性显著增加。体积散射保持不变，表面散射功率略有下降。体积散射功率和双反弹功率随GSV的增加而增加，而表面散射功率则随GSV的增加而减小。在疏林条件下，未冻条件下，地表散射高于体散射，而在密林条件下，体散射占主导地位。该方案是不同的，在冻结条件下，茂密的森林，表面散射高于体积散射。此外，还观察到树种对极化分解能力的轻微影响。落叶松与白杨、桦树和松树在解冻条件下的表面散射功率分别为+2 dB，体积散射功率和双反射散射功率分别为-1.5 dB和-1.2 dB。
In order to assess the potentiality of ALOS L-band fully polarimetric radar data for forestry applications, we investigated a four-component decomposition method to characterize the polarization response of Siberian forest. The decomposition powers of surface scattering, double-bounce and volume scattering, derived with and without rotation of coherency matrix, were compared with Growing Stock Volume (GSV). To compensate for topographic effects an adaptive rotation of the coherency matrix was accomplished. After the rotation, the correlation between GSV and double-bounce increased significantly. Volume scattering remained same and the surface scattering power decreased slightly. The volume scattering power and double-bounce power increased as the GSV increased, whereas the surface scattering power decreased. In sparse forest, at unfrozen conditions the surface scattering was higher than volume scattering, while volume scattering was dominant in dense forest. The scenario was different at frozen conditions for dense forest where the surface scattering was higher than volume scattering. Moreover, a slight impact of tree species on polarimetric decomposition powers has been observed. Larch was differed from aspen, birch and pine by +2 dB surface scattering power and also by −1.5 dB and −1.2 dB volume scattering power and double-bounce scattering power respectively at unfrozen conditions.