LRO has a laser onboard that measures surface elevation.
LRO有一个测量表面高度的车载激光器。
This height is calculated relative to an average elevation determined for the moon's surface, since there is no such thing as a "sea level" as a reference on the moon.
这个高度是对比月球表面平均高度后计算出来的，因为月球表面并没有“海平面”作为参照。
The graph below the images tracks the surface elevation of Devils Lake from the late nineteenth through the early twenty-first centuries.
图像下面的图表记录了魔鬼湖在19世纪末到21世纪初的水面高度的变化轨迹。
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