{"guid":"fe3b05b5-2be5-5f73-bbac-26bb3220ab69","title":"Introduction to Coordinate Systems","subtitle":null,"slug":"fossgis2023-23413-introduction-to-coordinate-systems","link":"https://pretalx.com/fossgis2023/talk/EF8ZLA/","description":"Brief introduction to Coordinate Reference Systems. Why do we need them; how do we model the earth (sphere, ellipsoid, geoid); Why/how do we use projected systems, like transverse Mercator or LCC. 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