altitude above the sea level

Because the satellite's altitude above sea level is known, the thickness of the ice above sea level can then be determined, allowing the overall thickness of the ice to be calculated.

因为该卫星的海拔高度已知，于是就能够确定海平面以上的冰层厚度，从而可以计算出冰层的总厚度。

Midui glacier, located in Yupu Township, is the lowest altitude above sea level in the world. It was ranked by China National Geography Magazine as one of the top six most beautiful glaciers in China.

米堆冰川位于玉普乡，是地球上海平面以上的最低点，被中国国家地理杂志评选为中国六条最美冰川之一。

It passes through some of the worlds highest mountain passes in the world, with a mean altitude in between 2 to 3 miles above sea level.

公路穿过世界最高的山脉，海拔2至3公里。