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If you are into Java and want Flexibility, Graphhopper is an excellent alternative. Peter, the project lead, actively encourages extensions and changes and the community is very responsive. Graphhopper works differently to Pgrouting (I use both) and it is extremely fast. Instead of using a PostGis database, Graphhopper builds its graphs direct form the .pbf ...


Let's start by providing some missing details (because I doubt most readers know what the Tienstra resection problem is). There are three control points A, B, C, visible from an unknown point P. Angles at P between points A, B, C are observed, via theodolite or sextant, as α, β, γ. Angles at the corners of the triangle ABC are calculated, ...

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