> Under project properties, general tab - change "ellipsoid" to "None /Planimetric".
Done, but calculated area is still... geodetic area?. I've tried ArcGIS and, for my GEO layer, It gives me desired area (same as an UTM layer, calculated with OTF off); so, it's me or QGIS, but I can't do this task in one step on QGIS: first I've to reproject mi GEO layer into an UTM one; disable OTF and finally calculate area (planar, as UTM is) in the new UTM layer. Carlos🤔 2016-10-18 19:58 GMT-05:00 Nyall Dawson <nyall.daw...@gmail.com>: > On 19 October 2016 at 02:22, Carlos Cerdán <sig.up...@gmail.com> wrote: > > It was my fault. I was used to consider plane areas as "correct", > forgetting > > ellipsoidal areas. So, QGIS give us freedom to calculate planar or > > ellipsoidal (geodetical) areas, but we must be careful about settings; Is > > not it?. Sometimes, too much freedom is annoying! > > > > But, How can I calculate UTM (planar) area from a GEO layer in one step? > > Under project properties, general tab - change "ellipsoid" to "None / > Planimetric". > > I keep meaning to split up the concept of ellipsoidal measurement from > OTF reprojection. In my view these are two different concepts - one is > just about display of data, the other relates to measurement. Ie, you > should be able to perform ellipsoidal calculations even if OTF > rendering is disabled. > > I just keep forgetting to do it early in a release cycle for extensive > testing... > > Nyall > > >
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