In an application, you often need to make these calculations:
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Calculate the distance between two points
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Calculate the azimuth to go from one point to another.
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Calculate a point from a given start point, azimuth and distance.
These calculations depend on the used coordinate system and on the interpretation of a line. You need to create them for a specific combination of a coordinate system and interpretation of the line type.
You can obtain a geodesy calculation implementation using a geodesy factory method . The factory method throws an exception if you request an implementation that is not supported or does not make sense.