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Triangulation is the process of determining the location of a point by forming triangles to the point from known points. It is used in surveying, navigation, computer vision and other fields, and has a long history dating back to ancient Egypt and Greece.
Learn about the process and history of triangulation, a surveying method that uses angles and trigonometry to locate points. Find out how to calculate the coordinates of an unknown point using triangulation formulae and examples.
Learn how to calculate the distance between two points on the Earth's surface using different approximations and formulae. Compare flat, spherical and ellipsoidal models and their errors and limitations.
Perambulators, or measuring wheels, were used to measure longer distances but not to a high level of accuracy. Tacheometry is the science of measuring distances by measuring the angle between two ends of an object with a known size. It was sometimes used before to the invention of EDM where rough ground made chain measurement impractical.
A linear scale, also called a bar scale, scale bar, graphic scale, or graphical scale, is a means of visually showing the scale of a map, nautical chart, engineering drawing, or architectural drawing. Learn how linear scales are used, named, and vary with latitude and projection.
Learn the difference between relative and absolute bearings in navigation, and how they are measured and used in various situations. Relative bearing is the angle between the craft's heading and the object, while absolute bearing is the angle between north and the object.
Google Maps offers satellite imagery, street maps, 360° views, traffic conditions, and route planning for various modes of transportation. It was launched in 2005 by Google, after acquiring several companies that developed the technology and data behind it.
Scale is the ratio of a distance on the map to the corresponding distance on the ground. Learn about different types of scale, such as nominal, point, bar, and lexical, and how they vary across maps depending on the projection and the area.
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