[Qgis-user] Re: Can not use an attribute called LENGTH in calculations

[magerlin]

Yves Jacolin-2 wrote
> 
> I get an error with this shapefile: "not a correct data source" (well the 
> message is in french actualy).
> 

Strange - I have no problem opening it??

But now I rediscovered another problem - the length function (and the scale
bar) gives totally wrong values (about double up) when using the Google
Mercator projection EPSG:900913 - se my old post 
http://osgeo-org.1803224.n2.nabble.com/Errors-with-distances-in-Google-Mercator-Projection-td6845255.html
http://osgeo-org.1803224.n2.nabble.com/Errors-with-distances-in-Google-Mercator-Projection-td6845255.html 

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Regards Morten

(Qgis 1.7.1 and Win 7)
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