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I need to convert GPS coordinates to EPSG:54004 on android. Are there any libraries or formulas to acomplish the task? Thanks in advance.

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54004 is not an EPSG authority object, but an Esri one--WGS 1984 World Mercator. Mathematically, it's the same as EPSG:3395 (although 3395 uses a scale factor = 1 and Esri's world Mercator is using standard parallel 1 = 0. –  mkennedy Sep 7 '12 at 18:31
    
Thanks for help. But I am noob in gis. Can you please help me with my problem? –  alekz Sep 10 '12 at 7:00
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I'm sorry but I don't know about available Android libraries. A web search on android "map projection" turned up several questions on stackoverflow.com, a partial port of PROJ.4 on sourceforge.net, etc. –  mkennedy Sep 10 '12 at 16:26
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