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。

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In this paper, the methods of drawing contour line from terrain map, the vector of contour line and generating elevation data from vector data are discussed.

论述了从地形图中提取等高线、对等高线矢量化以及通过矢量数据生成高程数据的实现方法。

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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。

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BaseCamp displays topographic map data in 2-D or 3-D on their computer screen, including contour lines and elevation profiles.

ENGADGET: Four new Oregon touchscreen GPS devices pop up on Garmin's website (updated)

Using elevation data from Nasa's ICESat, cross-checked with other Nasa satellites, the team was able to map the rise and fall of the overlying ice, and hence areas where water pooled or flowed away.

BBC: Satellite images reveal the changes in volume of water