So, you know that if you walk on the line that says 500, you stay always at 500 meters in elevation.

这样你就知道如果你走在500这条线上，那么你总是处在500米的海拔高度。

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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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Elevation of outdoor terrace: keep in line with the peripheral roads and sidewalk.

室外地坪标高：与周边市政道路和人行道保持一致。

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