Re: [Qgis-user] QGIS 2.8.2 no values calculating area with Export/Add Geometry Columns on Ellipsoid

[ralfwessels]

SBL wrote
> Hi,
> 
> seems to be related to this one:
> https://hub.qgis.org/issues/12057
> (see esp. note 18)
> 
> Cheers
> Stefan

Hi,
thanks for that hint.
Could be that 'my' problem is related to the other problems "calculating the
correct area in QGIS".
The 'right way' to calculate areas in QGIS seems to be a never ending story
as I can remember bugs and errors in earlier versions, too.
I know calculating areas in GIS is a complex topic, because different
parameters can affect the result.
But - as area calculating is probably one of the mostly used functions in
QGIS - it should be possible to create a stable, easy and user-friendly
solution.
I'm a GIS trainer and as long QGIS has problems with this function I will
recommend my students to use PostGIS (ST_Area...) to calculate areas they
can trust.

best greetings from Berlin
Ralf
 



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Re: [Qgis-user] QGIS 2.8.2 no values calculating area with Export/Add Geometry Columns on Ellipsoid

[Blumentrath, Stefan]

Hi,

seems to be related to this one:
https://hub.qgis.org/issues/12057
(see esp. note 18)

Cheers
Stefan

Von: qgis-user-boun...@lists.osgeo.org  im 
Auftrag von ralfwessels 
Gesendet: Samstag, 30. Mai 2015 14:04
An: qgis-user@lists.osgeo.org
Betreff: [Qgis-user] QGIS 2.8.2 no values calculating area with Export/Add 
Geometry Columns on Ellipsoid

Hi all,
I tested the area calculating functions in QGIS 2.8.2  and figured out, that
I just get zero values when using the function Vector > Geometry Tools >
Export/Add Geometry Columns calculating on Ellipsoid.
I tested it with shape-files and PostGIS-Layers with the QGIS Windows
Installer Version 64bit.
I suppose this is a bug in version 2.8.2 because it works in 2.6
In 2.8.2 it also works when calculating on Layer CRS or Project CRS, but not
on Ellipsoid.
Can someone reproduce this error?

Another strange thing when using the Export/Add Geometry Columns - function
ist the message (see screenshot) I always get when click OK to execute the
function.


Is this warning normal? I don't have the layers attribute table open.

Best greetings from Berlin
Ralf



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