Hi, You can apply simplification functions from Oracle or PostGIS. These function will return a simplified objects.
On Tue, Aug 12, 2014 at 3:01 PM, PREVOSTO, Laurent <laurent.prevo...@sfr.com > wrote: > Hi, > > I understand your approach but i definately prefer to draw nothing or an > “error” tile than just draw a random part of the network (a wrong > information) > > Because, users tend to believe what they see J > > > > In my case, I am tempted to lower the timeout rendering of geoserver and > consider that a tile that needs more than, let’s say, 10 sec to draw is not > worth rendering. > > But then Apache mod_jk load-balancer put that very Tomcat in FAIL state > and I could not figure out a configuration that actually works. > > > > Regards, > > > > Laurent > > > > *De :* Mike Grogan [mailto:d.michael.gro...@gmail.com] > *Envoyé :* vendredi 8 août 2014 18:04 > > *À :* PREVOSTO, Laurent > *Cc :* geoserver-users@lists.sourceforge.net > *Objet :* Re: [Geoserver-users] Limiting rendering for large resultsets > > > > A crude approach I have used in the past is to add an integer attribute to > my points or lines and then to assign a random attribute value from a range > that is based on the density of features in the area. I then specify in > the SLD that only features greater than some number should be displayed for > particular zoom levels. > > > > For instance, > > > > For your city features, you might assign a random integer attribute to > each of them from a range between, say, 0 and 1000. > > > > For your countryside features, you might assign a random integer attribute > that have a range between 700 and 1000. > > > > Then, say for a zoom level 5 or 6, you might specify in the SLD to only > show features whose attribute > 700. > > > > Doing this, you end up keeping all of the countryside features, but > randomly filtering out city features. > > > > At greater zoom levels ... just say 9, 10, or so (depending on your > situation), you then show features whose attribute > 500, 400, etc., > thereby allowing more city features to be shown as you zoom in. > > > > I could probably have done some statistics to tell me the exact ranges to > use, but trial & error worked fine for me. > > > > - Mike Grogan > > > > > > > > > > On Wed, Aug 6, 2014 at 5:39 AM, PREVOSTO, Laurent < > laurent.prevo...@sfr.com> wrote: > > Hello, > > We have geoserver based WMS services that display a quite large network > (lots of points and polylines stored in an Oracle Spatial database). > > > > When in the cities, the number of items can be very large > > In the countryside, of course, the density of polylines is quite low. > > > > If I try to render a whole city, since there are too many items to > render, the request will timeout. > > But if I set a scale condition to avoid drawing thousands of lines when in > a large city, users complain that they can’t find the cables when in the > countryside… > > > > So my question was : is there a way to tell geoserver to render a blank > image if there are more than n items in the Oracle resultset ? > > That way, I could keep a large scale in my TLD without going timeout in > areas where there is a high density of items. > > > > Regards, > > > > Laurent > > > > ------------------------------------------------------------------------------ > Infragistics Professional > Build stunning WinForms apps today! > Reboot your WinForms applications with our WinForms controls. > Build a bridge from your legacy apps to the future. > > http://pubads.g.doubleclick.net/gampad/clk?id=153845071&iu=/4140/ostg.clktrk > _______________________________________________ > Geoserver-users mailing list > Geoserver-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/geoserver-users > > > > > ------------------------------------------------------------------------------ > > _______________________________________________ > Geoserver-users mailing list > Geoserver-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/geoserver-users > > -- Daniel Bevilacqua cel +55 19 81383157
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