Hi Andrea,
You were actually right, I was testing against 4326 and not 3857 where the
problem first manifest. Just to confirm that using "&scaleMethod=accurate" in
the wms request does indeed solve the problem.
Many thanks,Corina
On Friday, 22 November 2019, 10:19:58 GMT, Andrea Aime
<[email protected]> wrote:
Hi Corina,you can also open a bug report in the ticket tracker too, so that we
don't forget about it.
CheersAndrea
On Fri, Nov 22, 2019 at 11:15 AM Corina Tudorache <[email protected]> wrote:
Hi Andrea,
Thank you very much for your reply, using scaleMethod definitely gets us closer
to the what we need, but there is still a small difference.
What we found to work, is using this approach:
<ogc:Div>
<ogc:PropertyName>error</ogc:PropertyName>
<ogc:Function name="cos">
<ogc:Function name="toRadians">
<ogc:PropertyName>Lat</ogc:PropertyName>
</ogc:Function>
</ogc:Function>
</ogc:Div>But this means we would need to have the values of
latitude and longitude defined in the shapefile, and we would like to use
directly the geometry field instead.
I can share a few screen shots if needed.
Cheers,
Corina
On Friday, 22 November 2019, 09:10:46 GMT, Andrea Aime
<[email protected]> wrote:
On Thu, Nov 21, 2019 at 8:06 PM Jody Garnett <[email protected]> wrote:
Different projects describe a vastly different shape of the world and have
different distortions of scale (often as you move north south). It looks like
the two projections you describe cover the UK and and a large section of the
northern hemisphere respectfully.
The rescaling is done based on the OGC scale denominator, which has simplified
formulas, in particular, not taking into account the projection local
deformation.On the other side, it can be computed anywhere and it's mandatory
for interoperability (see the SLD specification for the method).
On the other side, the geometries get the full deformation of the projection,
which for the case of 3857 in UK, is already pretty severe (UK area isI believe
3 times bigger than it actually is on web mercator*).
The WMS has an option to force a "true scale" computation, see
https://docs.geoserver.org/latest/en/user/services/wms/vendor.html#scalemethodYou
can add it to your requests and see if it fixes the problem, but I'm not sure
if it affects the scale denominator used for rule activation, or it getsused
all the way through
CheersAndrea
*: you can play with
https://thetruesize.com/#?borders=1~!MTcyMDU3MzE.NzEyNjY1Mw*MzIzMTM4Nzc(MzA0NjI5OQ~!CONTIGUOUS_US*MTAwMjQwNzU.MjUwMjM1MTc(MTc1)MA~!IN*NTI2NDA1MQ.Nzg2MzQyMQ)MQ~!CN*OTkyMTY5Nw.NzMxNDcwNQ(MjI1)Mg~!GB*NjI4OTc.MTYwMTYwOTQ)Mw
, try dragging UK to the equator, where there is almost no deformation
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