Hi Jason,
if you could open a ticket I believe it would still be useful, the myth
that prepared statements
are always faster is quite widespread, so I guess many may end up enabling
them.
Cheers
Andrea
On Thu, Sep 7, 2017 at 7:56 PM, Jason Newmoyer <ja...@newmoyergeospatial.com
> wrote:
> Great. Thanks for the info! I'll write up this issue with
> preparedStatements not getting simplified. I did not realize that about
> performance with prepared statements on postgres.
>
>
>
>
> Jason Newmoyer
> Newmoyer Geospatial Solutions
> 843.606.0424 <(843)%20606-0424>
> ja...@newmoyergeospatial.com
>
>
>
> On Thu, Sep 7, 2017 at 3:51 AM, Andrea Aime <andrea.a...@geo-solutions.it>
> wrote:
>
>> On Tue, Sep 5, 2017 at 10:05 PM, Jason Newmoyer <
>> ja...@newmoyergeospatial.com> 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
>>
>> ==
>> GeoServer Professional Services from the experts! Visit
>> http://goo.gl/it488V for more information.
>> ==
>>
>> Ing. Andrea Aime
>> @geowolf
>> Technical Lead
>>
>> GeoSolutions S.A.S.
>> Via di Montramito 3/A
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>>
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--
Regards,
Andrea Aime
==
GeoServer Professional Services from the experts! Visit http://goo.gl/it488V
for more information.
==
Ing. Andrea Aime
@geowolf
Technical Lead
GeoSolutions S.A.S.
Via di Montramito 3/A
55054 Massarosa (LU)
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 339 8844549
http://www.geo-solutions.it
http://twitter.com/geosolutions_it
AVVERTENZE AI SENSI DEL D.Lgs. 196/2003
Le informazioni contenute in questo messaggio di posta elettronica e/o
nel/i file/s allegato/i sono da considerarsi strettamente riservate. Il
loro utilizzo è consentito esclusivamente al destinatario del messaggio,
per le finalità indicate nel messaggio stesso. Qualora riceviate questo
messaggio senza esserne il destinatario, Vi preghiamo cortesemente di
darcene notizia via e-mail e di procedere alla distruzione del messaggio
stesso, cancellandolo dal Vostro sistema. Conservare il messaggio stesso,
divulgarlo anche in parte, distribuirlo ad altri soggetti, copiarlo, od
utilizzarlo per finalità diverse, costituisce comportamento contrario ai
principi dettati dal D.Lgs. 196/2003.
The information in this message and/or attachments, is intended solely for
the attention and use of the named addressee(s) and may be confidential or
proprietary in nature or covered by the provisions of privacy act
(Legislative Decree June, 30 2003, no.196 - Italy's New Data Protection
Code).Any use not in accord with its purpose, any disclosure, reproduction,
copying, distribution, or either dissemination, either whole or partial, is
strictly forbidden except previous formal approval of the named
addressee(s). If you are not the intended recipient, please contact
immediately the sender by telephone, fax or e-mail and delete the
information in this message that has been received in error. The sender
does not give any warranty or accept liability as the content, accuracy or
completeness of sent messages and accepts no responsibility for changes
made after they were sent or for other risks which arise as a result of
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