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.

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折叠内插结构模数转换器由于在速度、分辨率、功耗和芯片面积等方面具有良好的特性而成为了近年来的一个研究热点。

With the nice features in speed, resolution, power consumption and proportion, folding and interpolating analog-digital converter becomes a study hotspot in recent years.

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