设计方案中对已有的数字高程模型进行加密内插，使用三角化方法来计算地表曲面面积，采用参考平面法实现区域通视分析。
Then triangulation is used for the calculation of a polygon's surface area, and viewshed analysis is carried out using the method of reference plane.
通视性分析的主要任务是找出使飞行器能够躲避给定的观察者，如雷达站、空中预警飞机和拦截飞机等区域。
The main work of the visibility analysis is to find hidden area which is not visible to the observers, such as radar, air pre alarm aircraft, interceptor etc.
通视性分析的主要任务是找出使飞行器能够躲避给定的观察者，如雷达站、空中预警飞机和拦截飞机等区域。
The main work of the visibility analysis is to find hidden area which is not visible to the observers, such as radar, air pre alarm aircraft, interceptor etc.
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