If you store in a geography the unit is meters. If you store WGS84 in a geometry it's radians/degrees. Try casting to ::GEOGRAPHY.
Jo 2013/5/10 image <lcel...@latitude-geosystems.com> > Hello, > > i would like generate a buffer (20kms) around my shapefile (line). > > In a 1st time, i tied to do that with wgs84 parameters (for the layer & > project). But the result was a big circle. > > In 2 2nd time, i converted my raw shapefile into wgs 84 mercator world. I > entered this value for buffer-distance : 20000. i think the unity is meter. > Could you confirm to me that the unity is meter? > > I succeed in generating a buffer. But when i measure the value of the > buffer > with the measurement tool, the value is 15 kms, no 20 kms. > > Could you throw light for me ? > > Thanks. > > > > -- > View this message in context: > http://osgeo-org.1560.x6.nabble.com/Buffer-with-qgis-wgs84-mercator-world-tp5052504.html > Sent from the Quantum GIS - User mailing list archive at Nabble.com. > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-user >
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