[Geoserver-users] WMS Polygons as PointSymbolizer - missing points

GeoServer GeoServer User
1

Hi all,

I'm encountering something strange when trying to display a polygon layer from Postgres as a WMS using a PointSymbolizer (testing using default "point" sld).

The link to the preview is below:
http://www.salford.gov.uk/geoserver/wms?request=GetMap&layers=NE:v_point_display_test&styles=&width=512&height=445&srs=EPSG:3857&format=application/openlayers&tracker=20150312-Testing&bbox=-253000,7057000,-207000,7096000

There is a total 237 polygons features all within the initial viewport, if you zoom out the 4 points that are displayed should disappear, and if you zoom in more should appear.

Any ideas why they're not all being displayed all the time? I know it will be difficult to discern between the points when zoomed out, but at present it looks like there are no features.

Many thanks,

Rob
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2

On Thu, Mar 12, 2015 at 4:22 PM, Langford, Robert <
Robert.Langford@anonymised.com> wrote:

Hi all,

I'm encountering something strange when trying to display a polygon layer
from Postgres as a WMS using a PointSymbolizer (testing using default
"point" sld).

The link to the preview is below:

http://www.salford.gov.uk/geoserver/wms?request=GetMap&layers=NE:v_point_display_test&styles=&width=512&height=445&srs=EPSG:3857&format=application/openlayers&tracker=20150312-Testing&bbox=-253000,7057000,-207000,7096000

There is a total 237 polygons features all within the initial viewport, if
you zoom out the 4 points that are displayed should disappear, and if you
zoom in more should appear.

Any ideas why they're not all being displayed all the time? I know it
will be difficult to discern between the points when zoomed out, but at
present it looks like there are no features.

This is probably due to the generalization in postgis, you can turn that
off at the datastore level.
It's a known issue that relates to a known problem in PostGis own
ST_Simplify implementation:
https://jira.codehaus.org/browse/GEOT-4737
http://trac.osgeo.org/postgis/ticket/2093

But as said, you can just turn off the postgis simplification machinery at
the store config level

Cheers
Andrea

--

GeoServer Professional Services from the experts! Visit
http://goo.gl/NWWaa2 for more information.

Ing. Andrea Aime
@geowolf
Technical Lead

GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 339 8844549

http://www.geo-solutions.it
http://twitter.com/geosolutions_it

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3

Andrea,

Thanks that was it. I’m guessing that presently there’s no way to turn it off layer-by-layer and has to be done at the datastore level?

Cheers,

Rob

···

From: andrea.aime@…84… [mailto:andrea.aime@…84…] On Behalf Of Andrea Aime
Sent: 12 March 2015 17:15
To: Langford, Robert
Cc: geoserver-users@lists.sourceforge.net
Subject: Re: [Geoserver-users] WMS Polygons as PointSymbolizer - missing points

On Thu, Mar 12, 2015 at 4:22 PM, Langford, Robert <Robert.Langford@…5490…> wrote:

Hi all,

I’m encountering something strange when trying to display a polygon layer from Postgres as a WMS using a PointSymbolizer (testing using default “point” sld).

The link to the preview is below:
http://www.salford.gov.uk/geoserver/wms?request=GetMap&layers=NE:v_point_display_test&styles=&width=512&height=445&srs=EPSG:3857&format=application/openlayers&tracker=20150312-Testing&bbox=-253000,7057000,-207000,7096000

There is a total 237 polygons features all within the initial viewport, if you zoom out the 4 points that are displayed should disappear, and if you zoom in more should appear.

Any ideas why they’re not all being displayed all the time? I know it will be difficult to discern between the points when zoomed out, but at present it looks like there are no features.

This is probably due to the generalization in postgis, you can turn that off at the datastore level.

It’s a known issue that relates to a known problem in PostGis own ST_Simplify implementation:

https://jira.codehaus.org/browse/GEOT-4737

http://trac.osgeo.org/postgis/ticket/2093

But as said, you can just turn off the postgis simplification machinery at the store config level

Cheers

Andrea

–

==

GeoServer Professional Services from the experts! Visit

http://goo.gl/NWWaa2 for more information.

==

Ing. Andrea Aime

@geowolf

Technical Lead

GeoSolutions S.A.S.

Via Poggio alle Viti 1187

55054 Massarosa (LU)

Italy

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 e-mail transmission, viruses, etc.

4

On Fri, Mar 13, 2015 at 9:16 AM, Langford, Robert <
Robert.Langford@anonymised.com> wrote:

Andrea,

Thanks that was it. I’m guessing that presently there’s no way to turn it
off layer-by-layer and has to be done at the datastore level?

Correct. To do that we'd have to do some coding both at the geoserver and
at the datastore level

Cheers
Andrea

--

GeoServer Professional Services from the experts! Visit
http://goo.gl/NWWaa2 for more information.

Ing. Andrea Aime
@geowolf
Technical Lead

GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
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
e-mail transmission, viruses, etc.

-------------------------------------------------------