详细说明： 从高程图（digital elevation map）读取地形高度数据，将地形数据组织成均匀三角网格，通过OpenGL绘制三维地形，并进行地形纹理贴图。
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The 3d images from LRO orbital photography are being used to make an exact digital topographic map of the moon, and this is fact may tweak the mean elevation value.
LRO轨道摄影机拍摄的3d图像被用作制作月球精确数字地形图，而这可能会调整平均高度值。
Interferometric Synthetic Aperture Radar is an effective technique to get Digital Elevation Model and orthophoto map.
干涉合成孔径雷达是获取场景数字高程模型和正射影像图的有效技术之一。
The water levels and water volumes of the lake in different periods were calculated by using a digital elevation model created by the topographic map.
利用数字高程模型求取易贡湖各时相的水位与水量；
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