# How Do They Measure Elevation?

Altimeters measure altitude. An altimeter is a device that measures altitude, the distance of a point above sea level. Altimeters are important navigation instruments for aircraft and spacecraft pilots who monitor their height above earth’s surface.

## How Do They Measure Elevation?

How do they measure elevation? Elevation, or altitude, is the height of a point in relation to sea level. It is often used to measure the height of mountains, valleys, and other geographic features. Elevation is usually measured in meters or feet and is usually represented by a numerical value.

Measuring elevation can be done in two ways: by using a barometer or by using a GPS. With a barometer, the air pressure is measured at a given location, which is then compared to the average air pressure at sea level. This is then converted into elevation by assuming a certain relationship between the air pressure and altitude.

GPS is a more accurate method for measuring elevation. It is based on the satellitesâ€™ signals and calculates the elevation by triangulating the signals from three or more satellites. This method gives an accurate elevation reading as there is no conversion from air pressure to elevation involved.

Other methods to measure elevation include geodetic surveys. These surveys use mathematical formulas to calculate elevation by looking at the shape of the Earthâ€™s surface. They are often used to measure the elevation of a mountain peak or to calculate the height of a valley.

Laser altimetry is another method of measuring elevation. In