ground height meaning in Chinese

地基高度
地面标高
地面高程
距地面距离

General specification for ground height finding radar
地面测高雷达通用规范
Tectical performance test methods for ground height - finding radar
地面测高雷达战术性能试验方法
At what longitude and iatitude does guilin locate on the earth ? what is the ground height of the city of guilin above sea level
在地理位置上桂林的经、纬度各是多少?地面的平均海拔是多少