The height above or below sea level is "elevation". Altitude is used only for distance above sea level.
Normally it's called land when the elevation is above sea level, but it can be ice or snow.
Altitude
elevation.
elevation
The height of a mountain peak above sea level is called its elevation.
Elevation.
elevation
The height of a place above sea level is called elevation.
Elevation at sea level is elevation zero feet or meters above sea level.
The elevation of a place above sea level
Elevation
Elevation
Elevation
Elevation.
Frisco's elevation is 9,075 feet above sea level.