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Great circle computation and epsg dataset handling.

Available projections are Mercator, Transverse Mercator and Lambert Conformal Conic. All epsg dataset linked to these projections are available through python API using epsg id or name.

Four main grids are also available : Universal Transverse Mercator, Military Grid Reference System, British National Grid and Irish National Grid.

Gryd provides functions for map coordinates interpolation using calibration points. Two points minimum are required.

All Gryd objects are pickle-able ctypes Structure that can be directly used in C code.