Apple's mobile phone uses a barometer to measure the altitude of the App. Let's introduce it.

Altimeter Professional Edition can measure the height in real time.

Altimeter is a mobile phone software that can measure real-time height. It can draw a detailed route height map according to the altitude, and can also plan the travel route. This application allows you to view the height of all locations on the earth's surface. Just move the map to get the data, or enter the required address and location. You can use the online database, the built-in GPS or barometer on the device to find the altitude of the current position.

In addition, the built-in barometer on the equipment is used to determine the height of the current position. The application can use the color wizard to draw the recorded elevation on the map. You can measure the altitude from the raw air pressure data or the relative pressure at sea level.

Extended data:

Height measurement principle:

The height of the ground point measured from the average sea level is called altitude or absolute height. Mean sea level, also known as geoid, is characterized in that at any position on this surface, the mean sea level is perpendicular to the direction of gravity.

However, due to the uneven distribution of mass in the earth and the influence of the earth's rotation, the gravity direction of each point on the earth's surface does not all point to the center of the earth, that is, the gravity direction is different from place to place, which makes the average sea surface (geoid) not a standard sphere, but an irregular surface.

One of the main differences between information mapping and traditional mapping is that traditional mapping takes two-dimensional map plane as information carrier, while information mapping and digital ocean construction need to realize three-dimensional visualization in an all-round way. Therefore, it is an essential basic work to accurately determine the starting point of elevation and measure the elevation of various places. Whether it is to determine the elevation of land or to dynamically monitor the ocean, it is of great significance to measure the sea level.

In actual observation, gravity and atmosphere will interfere with the accurate measured values, so we should observe the gravity and meteorological conditions while measuring Everest, and make various corrections and calculations to get the best results.

Appstore- Altitude Table Professional Edition