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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Low VHF-band backscatter from coniferous forests on sloping terrain
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Low VHF-band backscatter from coniferous forests on sloping terrain

机译：倾斜地形上针叶林的VHF波段低背向散射

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摘要

Low-frequency synthetic aperture radar (SAR) is a promising technique for stem volume retrieval, particularly for dense forests, due to the good penetration of forest canopies. However, it is well known that the dominant scattering mechanism, the trunk-ground dihedral interaction, decreases rapidly on sloping terrain. In this paper, we use low VHF-band SAR data, collected with CARABAS over dense coniferous forests in Sweden, to examine the effect of topography. Using flight passes with different headings, the effect of slope and aspect angle on backscatter is characterized. For tall trees (/spl sim/30 m), on the steepest slopes in the test-site (up to /spl sim/12/spl deg/), differences of up to 8 dB are observed between images acquired with different look directions relative to the slope. A physical model is developed to investigate the different scattering mechanisms and their sensitivity to terrain slopes. The model shows that the trunk-ground scattering still dominates the response for large trees on moderate slopes, and a semiempirical model for the effect of topography on backscatter is proposed. The model shows good agreement with measurements, indicating the possibility of using it to compensate for the effects of sloping terrain when retrieving stem volume in coniferous forest.
机译：低频合成孔径雷达（SAR）是一种有前途的技术，可用于茎体积检索，尤其是对于茂密的森林，这是因为其林冠具有很好的穿透性。但是，众所周知，在倾斜的地形上，主要的散射机制即主干-地面二面体相互作用迅速减小。在本文中，我们使用在瑞典茂密的针叶林上通过CARABAS收集的低VHF波段SAR数据来检验地形的影响。使用具有不同航向的飞行通行证，可以表征坡度和纵横比对反向散射的影响。对于高大的树木（/ spl sim / 30 m），在测试现场的最陡坡上（最大/ spl sim / 12 / spl deg /），在以不同视线方向获取的图像之间观察到的差异最大为8 dB。相对于坡度。开发了一个物理模型来研究不同的散射机制及其对地形坡度的敏感性。该模型表明，树干-地面散射仍然主导着中等坡度上大树的响应，并提出了地形对背向散射影响的半经验模型。该模型与测量值显示出很好的一致性，表明在取回针叶林的茎量时，可以使用它来补偿坡度的影响。

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