[OpenLayers-Users] OL Vector Layer: What are the Limitations?

[Dipl. Inf. Carsten Eider]

I tried about

    * 1500 polygons
    * with a average of 10 points per polygons

on a single layer in Firefox 2.0 with XForms-Plugin.

In my development-enviroment(Intel DualCore 2,66 GHz, 2GB RAM) it took 
less then 6 secs to draw the layer,
even selecting the features by mouse events worked very fine.
Delivering the exampel to a customer-system (P4 1,7 GHz, 256 MB RAM) 
called me back to reality.
It took more than 2 minutes to a a useful result, selecting feature 
responsed within 10 seconds.

My final solution was to remove the functionality from Openlayers into a 
GeoServer.
Not it is less than 5 sec on every system.

We made similar experiences in a different project where we had to draw 
about 200 polygons
in various color depending on a given state.

Thx Carsten

Erik Uzureau schrieb:
> Dear users, dev,
>
> Someone asked me today what the max number of coordinates could be
> drawn for a geometry with the OL Vector Layer and I did not know how
> to really answer. I asked cr5 and he gave me some off the cuff
> estimates, which I have added to the FAQ here:
>
> http://trac.openlayers.org/wiki/FrequentlyAskedQuestions#WhatisthemaximumnumberofCoordinatesFeaturesIcandrawwithaVectorlayer
>
>
> Basically, he has suggested the following as upper bounds of reasonable use:
>
>     * ~2500 Coordinates
>     * ~100-200 Features (Since each geometry is rendered as a separate
> DOM object, dragging and the like get seriously slowed down the more
> features you have on the map.)
>
>
> If you've been using the vector layers in different browsers or with
> different limits... please let us know by either replying to this
> email... or just going right in and directly ediitng the wiki itself.
> The more input we have the better we know our own limits.
>
> Thanks for anyone who can chime in
> --Erik
> _______________________________________________
> Users mailing list
> Users at openlayers.org
> http://openlayers.org/mailman/listinfo/users
>
>   

-- 
Mit freundlichen Grüßen / Yours faithfully
Carsten Eider

Dipl. Inf. (FH)

Kompetenzzentrum für Innovative Informationssysteme

c/o Fachhochschhule Bingen / University of applied sciences Bingen

Berlinstraße 109
55411 Bingen

Tel: +49 (0) 6721 / 409-179
Fax: +49 (0) 6721 / 409-158
email: eider at fh-bingen.de
Internet: iis.fh-bingen.de 

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