[Qgis-user] Area Calculations - what the h... is going on?

[Neumann, Andreas]

Noticed that the issue in this thread was specific to geometries
containing CompoundCurve geometries. Not sure if you use them? 

Andreas 

On 2017-07-06 17:16, Neumann, Andreas wrote:

> Hi Morten, 
> 
> Sounds familiar - see http://osgeo-org.1560.x6.nabble.com/Area-calculation-issues-td5305669.html 
> 
> Perhaps you have an older version of 2.18 without the bug fix? Note that there is now version 2.8.10 with numerous bug fixes since 2.18.3 (which you seem to use). 
> 
> Andreas 
> 
> On 2017-07-06 16:38, magerlin wrote:
> 
>> I normally use $area in the field calculator to calculate areas of polygon
>> but now this is really weird.
>> 
>> I have 5 polygons in the same shape file and tries to calculate the areas -
>> but two of the polygon get areas of about 100 times as big as they should be
>> while the 3 remaining polygons get ok areas. If I use area($geometry)
>> instead I get OK areas:
>> 
>> <http://osgeo-org.1560.x6.nabble.com/file/n5326908/Area_Calc.png> 
>> 
>> According to the field calculator:
>> $area: The area calculated by this function respects both the current
>> project's ellipsoid setting and area unit settings
>> 
>> Area($geometry):  Calculations are always planimetric in the Spatial
>> Reference System (SRS) of this geometry, and the units of the returned area
>> will match the units for the SRS.
>> 
>> According to the "Topology Checker" the topology of the polygons are OK.
>> 
>> The file is here (EPSG: 32634): 
>> Test_Area.zip
>> <http://osgeo-org.1560.x6.nabble.com/file/n5326908/Test_Area.zip>  
>> 
>> -----
>> Regards Morten
>> 
>> Currently using Qgis 2.18.3 (OSGeo4),
>> Windows 7, 64bit
>> --
>> View this message in context: http://osgeo-org.1560.x6.nabble.com/Area-Calculations-what-the-h-is-going-on-tp5326908.html
>> Sent from the QGIS - User mailing list archive at Nabble.com.
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