On Tue, Sep 5, 2017 at 10:05 PM, Jason Newmoyer <
[email protected]> wrote:
> Okay, I changed PreparedStatements to false and now it is using
> ST_Simplify!
>
> I think that should be considered a bug and I'll be happy to write it up.
>
Yep. Though, if you care about performance you should not be using prepared
statements against postgresql
(yes, I know, Oracle brainwashed us with prepared statements always on, but
for GIS PostgreSQL makes
smarter choices when they are off, although the most recent version of
postgresql became smarter and
learned to re-plan a prepared statement based on the current bound values
so... not sure how well that
works, it may be that with the latest version of postgresql the setting
became irrelevant performance wise).
>
> I'm still interested in the question of using simplify for geometry
> transformations is SLD. It seems like all the pieces are there to make it
> happen. Would give map authors ultimate flexibility for cases like this.
>
In SLD it's likely useless or detrimental, GeoServer already does geometry
decimation before rendering (unless the
store does it on its behalf, that is).
>
> The on the fly simp is great. How is the scale factor determined? Would it
> make sense to have that be configurable?
>
It's computed to be 0.8 on screen pixels (transformed back to real
coordinates of course). If a database
It is not configurable, if you want to play with it try changing
RenderedImageMapOutputFormat in GeoServer
and call setGeneralizationDistance on the StreamingRenderer instance.
Cheers
Andrea
--
Regards,
Andrea Aime
==
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