The key technology is LOD algorithm. I use the view-dependent and terrain's roughness to determine the terrain detail. Before render the terrain.

本文的关键是LOD算法，我使用了视点相关以及和地形本身起伏程度相关的技术来决定地形应有的细节程度。

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Image matching is the key stage for digital Terrain Model (DTM) automatical aquisition using with digital images.

利用数字影像自动提取数字地形模型(dtm)的关键是影像匹配。

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The visualization of complex terrain is a common key issue among these applications.

这些应用中一个共同的核心问题就是复杂地形的地形地貌可视化的问题。

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Helicopter and ground operations aimed at taking hold of "key terrain" began early Friday, said Maj.

CNN: Militants killed in Afghan action, U.S. says

The use of different direct and indirect weapons, low- and high-angle artillery, are key when your enemy is using terrain to his advantage.

CNN: Grange