掀翻地面植被，岩石或树枝。
本文给出了地面植被电磁散射的半空间模型研究方法。
Electromagnetic scattering characteristics of ground vegetation in a half-space model are studied.
传统的步点法是一种用来统计和估测地面植被盖度的方法。
The step-piont method was traditionally used to measure the vegetative cover on the land surface.
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