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Add transformation to ENU coordinate system #105
Many of the US State Plane coordinates are East-North-Up in meters (or one of a couple different representations of feet--yuck). There are many more local coordinate systems in Proj.4 from all over the world. Proj.4 does give you the ability to define your own coordinate system, but you will have to pick a projection and a baseline.
The Proj.4 documentation can help you build a proj4 string to define most coordinate systems.