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Map Projection is a collection of classes used to project GPS data points onto maps. When plotting large areas of a sphere's surface on a two dimensional map, a linear projection from latitude/longitude to x/y is often undesirable, due to to distortions that appear around the edges. Many projections exist that deal with these distortions: Mercator's projection was designed to aid navigation, while equalarea projections are intended to preserve a constant scaling factor from the sphere to the map. A list of projections and their properties can be found at http://mathworld.wolfram.com/topics/MapProjections.html. This package can be used to convert GIS data to a few popular projections used in atlases and by map image providers, such as http://nationalatlas.gov or http://www.mapresources.com. If the specific parameters used to create a map are known, it is possible to use this package to plot geographical points to that map, or determine geographical position from map position. This package also has builtin methods for performing 2D transformations on the projected data  the raw output of a projection almost always must be scaled, rotated and translated to be useful. Map_Projection accomplishes this by using the package Math_Matrix. 

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