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This powerful geodesy app allows you to convert coordinates between many of the world’s coordinate systems, compute geoid offsets, and estimate the current or historic magnetic field for any location. It also includes surveying tools to compute the point scale factor and grid convergence. 
The app uses the PROJ4 library and a lookup file containing projection and datum parameters to support over 1700 coordinate systems. Lat/lon, UTM, US State Plane, and many, many others are supported. You can also create your own coordinate systems if you know the parameters.The app also supports affine transformations to allow you to set up local grid systems. See http://www.binaryearth.net/Miscellaneous/affine.html for details.


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