An altitude meter is an instrument used to calculate the altitude of an object over a fixed level. The measurement of altitude is called altimetry, which is associated to the term bathymetry, the measurement to calculate depth under water. This can be used for surveying.

An altitude meter is an instrument used to calculate the altitude of an object over a fixed level. The measurement of altitude is called altimetry, which is associated to the term bathymetry, the measurement to calculate depth under water. This can be used for surveying.