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That is, when your FlySight tells you you're at 10,000 feet, you may look at your altimeter and see an altitude of 9,500 feet. the definition of altitude - a line which passes through a vertex of the triangle and is perpendicular to the opposite side. For skydivers, this means that at a geometric altitude of 10,000 feet, your barometric altimeter might read 9,500 feet. The diagram shows an altitude of the triangle, but we could draw altitudes from the other two sides to the other two vertices. An altitude in a triangle is a line that cuts one of the sides at right angles and passes through the opposite vertex of the triangle. The bottom line is that geometric and barometric measurements can commonly differ by 5-10%. Definition of Altitude (Geometry) Altitude is another word for height. GPS versus Barometric Altitude: The Definitive Answer The altitude is a line segment that passes through a vertex and that. The following article discusses these differences in detail, and includes some real-world measurements which tell us how big the difference can be: When analyzing triangles, it is sometimes helpful to identify the altitude of a triangle. Because of this, a barometric altitude measurement rarely agrees perfectly with a geometric measurement. As skydivers, we see this all the time when we zero our altimeter in the morning, but by the afternoon it is a few hundred feet off. However, in practice there are many factors which affect atmospheric pressure. For example, if the air pressure is 69 kPa, the altitude would be about 10,000 ft above sea level.ĭifferences Between Geometric and Barometric Altitudeīarometric altitude measurement relies on a "standard" atmospheric model. Then, they convert this measurement to an altitude using a model similar to the one we see above. Conventional barometric altimeters make use of this relationship.