At present, GPS plane control net is widely applied, but the GPS elevation is not used widely. The people expect that the GPS elevation surveying can take the place of the conventional leveling.

当前，GPS平面控制网已经得到了广泛的运用，但是GPS高程却运用得不够，人们期望着能够用GPS高程测量代替传统的水准测量。

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DEM (Digital elevation Model) is a data set of plane coordinate or longitude, latitude, and elevation of the regular square grid points in some region.

数字高程模型(DEM)是一定区域范围内规则格网点的平面坐标及其高程的数据集或者是经、纬度和海拔高度的数据集。

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To manufacture besides the installation elevation conforming to the design requirement, it is very important to guarantee the level of the two directions of the plane.

制作除安装标高符合设计要求外，保证平面两个方向的水平是很重要的。

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Upon reaching a speed known as V2 (a calculation based on thrust, weight aboard the plane, airport elevation and outside temperature), pull back on the yoke, and away you go.

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