[Qgis-user] Re: How can we change x, y spatial reference system units to lat,long format in qgis?

[Zoltan]

PS
You also need to set these variables to the elipsoid of the grid reference
system you used.  Which for autocad generated files would be a sphere? I
don't know. so a and b would be set to the same value
i.e the radius of the sphere in meters - 6378137 for WGS sphere

var a = 6377563.396, b = 6356256.910;          // In my case this is Airy
1830 major & minor semi-axes 
 var F0 = 0.9996012717;                         // NatGrid scale factor on
central meridian
 var lat0 = 49*Math.PI/180, lon0 = -2*Math.PI/180;  // NatGrid true origin

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