[Qgis-user] FW: Again a problem with legth

Mon Dec 6 05:27:49 PST 2010

well thanks a lot, problem solved :)

Frederick Löbig
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> Date: Sun, 5 Dec 2010 20:04:55 +0100
> Subject: Re: [Qgis-user] FW: Again a problem with legth
> From: goyodiaz at gmail.com
> To: frederick.loebig at grunsnid.de
> CC: qgis-user at lists.osgeo.org
> 
> 2010/12/5 Frederick Löbig <frederick.loebig at live.de>:
> > Hey list...
> > I again have a problem with analyzing vector-data:
> > I have a Polyline-Shapefile with EPSG:900913 Projection. I know, by
> > measurements through Google Earth, that the total length of this line should
> > be 1000m.
> > I used the qGIS Ruler-Tool and checked that with "on the fly transf." on and
> > it was 1000m as well. After that, I used the field-calculator and the
> > $length-parameter in a "real"-field, but somehow it gives me out 1529.508
> > (m??)...
> 
> I can confirm this in trunk. The problem seems to be projection
> dependant as it does not happen using EPSG:23030. I guess you can get
> correct measures by reprojecting your shapefiles into a suitable UTM
> srs (you may have to change the project crs too, I did not test this).
> Far from ideal but it can help you to get the work done.
> 
> Goyo
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