Fwd: [Qgis-developer] QGIS 0.8 requires an update to sterea [was: Re: 0.8; here I go]

[Tim Sutton]

>
Forwarded on behalf or Maciej who is having problems posting to the  
list....

>> -------- Wiadomos'c' oryginalna --------
>> Temat: (Derived) Area is calculated wrong
>> Data: Wed, 02 Aug 2006 23:26:28 +0200
>> Nadawca: Maciej Sieczka <tutey at o2.pl>
>> Adresat: qgis-developer at lists.qgis.org
>>
>> There is a vector polygon Grass layer. It's area is, according to
>> 'v.to.db option=area units=k', 32281.680484. Also d.what.vect reports
>> "area size: 32281680484.380993". These seem correct, as after
>> rasterising it in Grass at 10m resolution the raster non-null area
>> (r.stats -a) is very close: 32281681800.000000.
>>
>> However, querying the same vector exported to shapefile (v.out.ogr
>> type=area) in QGIS 0.8 (current SVN) returns '(Derived) Area  
>> 32303.759
>> km2'. It's 22 km2 more!
>>
>> Querying the polygon Grass vector itself in QGIS returns the same  
>> wrong
>> derived area too.
>>
>> The more complicated shape, the bigger the difference.
>>
>> Could somemebody investigate? The shapefile is attached.
>>
>> Maciek
Tim Sutton
tim at linfiniti.com



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