Rendering 2d GIS layer in 3d environment is the key problem of realizing compact type of the two and three dimensional integration GIS system.

在三维系统中实时渲染二维图层是实现紧密型二三维结合GIS的关键。

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A balanced three-layer sample rotation pattern is presented in this paper to solve the problem of rotation for the quarterly surveys with three-stage sampling designs.

本文构造了一种平衡的三层次样本轮换模式，解决了三阶段抽样季度调查的三层次样本轮换问题。

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