[Qgis-user] jumping scale
carson.farmer at gmail.com
Fri Mar 13 08:56:26 EDT 2009
>> This behaviour is normal if the project works with an unprojected CRS
>> such as the default WGS-84, because the scale differs in each point
>> of the canvas. The canvas would has to be re-zoomed while panning to
>> keep the fixed scale. But isn't.
>> However the problem doesn't concern projected CRSes, so just set your
>> project CRS to any (say the Dutch 28992), enable on-the-fly and the
>> scale should remain fixed.
> I tried to set up a project in epsg:28992 and load a shape in 28992,
> but still have 'jumping scales' (though it indeed looks like in the
> North-South direction the jumps are much larger then in West-East
> Should I file a bug for this?
I still don't think you should file a bug, as epsg: 28992 is an oblique
stereographic projection. This means it is a conformal projection (i.e.
it preserves angles). It does not preserve distances or areas, and so
the scale will vary. You are best to use some sort of equidistant
Carson J. Q. Farmer
ISSP Doctoral Fellow
National Centre for Geocomputation (NCG),
Email: Carson.Farmer at gmail.com
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