[OpenLayers-Dev] How can i get the extent of the WMS (JS, WFS)
Bart van den Eijnden (OSGIS)
bartvde at osgis.nl
Wed Nov 14 04:01:28 EST 2007
The way to do this unfortunately is to also perform a WFS request with the
same filter. You can use GeoJSON as the output format. Then you can use the
bbox attribute of the GeoJSON featurecollection (note: this is very new in
Geoserver and has only been added yesterday) as the extent to zoom to.
Btw, it would be a nice enhancement if you could ask Geoserver only for the
bbox of the featurecollection, since you are not interested in the actual
Bart van den Eijnden
OSGIS, Open Source GIS
--------- Oorspronkelijk bericht --------
Van: springrider <springrider at hotmail.com>
Naar: dev at openlayers.org <dev at openlayers.org>
Onderwerp: [OpenLayers-Dev] How can i get the extent of the WMS (JS, WFS)
Datum: 14/11/07 06:54
> Good morning
> I am generating some maps using Geoserver and Openlayers which contain
> layers. I can not define in advance what should be the current extent
> because these WMS layers are generated from geoserver using cql_filter to
> select some specific polygons from my shapefile.
> The goal would be to know automatically the extent of the WMS in order to
> zoom on it.
> This is my current map: http://www.nabble.com/file/p13725061/OL1.jpg and
> this is what i would like to get automatically:
> http://www.nabble.com/file/p13725061/OL2.jpg .
> Is there a way to obtain by coding the current extent of the WMS (At
> geoserver or openlayers levels...)??
> I saw by using WFS service, we can get the gml:ccordinates
> can we extract this information and use it to define the extent of the
> Thanks for helping me, i start becoming crazy about that point.
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