[Qgis-developer] Area calculation issues

[Pedro Venâncio]

Hi Andreas and Nyall,

Please, share the conclusions here, after you find the problem.

Thanks!
Pedro



2017-02-01 10:02 GMT+00:00 Andreas Neumann <a.neumann at carto.net>:

> Sure - I'll send it to you as a geopackage file.
>
> Andreas
>
>
>
> On 01.02.2017 11:01, Nyall Dawson wrote:
>
>> On 1 February 2017 at 19:55, Neumann, Andreas <a.neumann at carto.net>
>> wrote:
>>
>>> Hi Nyall,
>>>
>>> Thanks for the explanations. I should have read the explanations of the
>>> help text more closely. It explains it all.
>>>
>>> However, there still seem to be issues. Consider the following results
>>> below. First column is the result of $area, second column is
>>> area($geometry).
>>>
>>> Sometimes the results are very close, in other cases the difference is
>>> massive. Like in the very first row. 32'087 vs 190'605'589 square meters.
>>> This can't be explained with ellipsoidical vs. planimetric. In this first
>>> row, the result of area($geometry) (planimetric) seems correct, while the
>>> ellipsoidical result ($area) is massively wrong.
>>>
>>> How can this huge difference be explained?
>>>
>>> Can you share your dataset?
>>
>> Nyall
>>
>
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