Thanks for the reply. I don't have SAGA or PostGIS set up at the moment.
(have sent Stefan the shapefile off-list).
Moritz - I know that the QGIS value is true. The polygon has been drawn
over a feature on a raster image (which I know is correct in its
On 19 May 2017 at 08:36, Moritz Lennert <mlenn...@club.worldonline.be>
> On 18/05/17 18:41, Blumentrath, Stefan wrote:
>> Hi James,
>> QGIS uses a ellipsoidal area measurement, while GRASS (like most of the
>> other GIS) uses a Cartesian measurement (others, please correct me if that
>> is not the case in WGS84).
>> See amongst others:
>> https://issues.qgis.org/issues/12057 and
>> Would you mind comparing area measurement of a third software (SAGA,
>> PostGIS, ...)?
> I would suggest making tests with polygons of which you know the area
> (e.g. simple squares to begin with)
Environment and Sustainability Institute
University of Exeter
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