During BRDF model constructing in urban areas, two important factors are vegetation covered in urban areas and the geometry structure of the urban.
在城市地区BRDF模型构建时，两个重要的影响因素是城市地区的植被覆盖面积比和城市的几何结构。
According to each structure module movement analysis and function, relevant structure model is set up and calculation is going on to definite geometry size for the important part.
针对每个结构模块的运动分析和功能需要，提出相关的结构模型，对重要的部件进行相关的设计计算，确定几何尺寸。
Reasonable designs of the structure parameters of PB layer and the gate-cathode geometry are obtained by numerical iteration and an equivalent current model.
文中采用数值迭代法和建立等效电流模型，对P_B层结构参数和门极-阴极几何图形尺寸进行了合理设计。
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