[Qgis-user] changing from non-earth to earth map

[M.E.Dodd]

I have some maps surveyed in non-earth coordinates, local small scale area but accurate within that area.  Now want to convert whole survey to a real earth map.  Can accurately survey a few points from the map to get lat long or ordnance survey locations but don't know how to then convert all the rest of the points and lines to lat long (or OS).  The original map is vector digital so its not an issue of simply locating a raster image.

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