Hi Stephane, if you calculate areas (or length) with the "Add geometry Columns"-Tool, the results depend on the settings you can make under "Calculate using". Here you have the options Layer CRS, Project CRS or Ellipsoid. Ellipsoid is calculating with the curvature of the earth (so far I know) and the others depending on the CRS' of the layer or the project (when 'on the fly' CRS transformation is enabled). If you are using $area in the field calculator it depends if 'on the fly' CRS transformation is enabled or not. If it is not enabled it calculates with the layer CRS, if it is enabled it should calculate with the project CRS.
These are my testing experiences so I'm not 100% sure, but maybe there is someone who has more informations about this topic. ralf -- View this message in context: http://osgeo-org.1560.x6.nabble.com/Area-calculation-tools-tp5173073p5173091.html Sent from the Quantum GIS - User mailing list archive at Nabble.com. _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
