Hello. Regarding the performance issue: in the first case three images are requested from GS, one for each WMS layers configured in OL. Althoug i'm not a GS expert, i think that in the second case only one image is requested - the three layers are combined in a single image. Does that make any sense ? Eric
2008/5/22, springrider <[EMAIL PROTECTED]>: > > Hello, > > I tried to play with the different output format (gif,PNG8) but the display > of the maps is always very slow when i zoom in. Moreover, i am still having > this uncorrect display of the plolygons. > > If anyone could help a lost newbie, I would be very thankful... > > Sylvain > > > springrider wrote: >> >> Good afternoon >> >> Sorry for the long title. I am developing a web application based on >> oracle, GeoServer and Openalyers. It works great but i have found some >> performance discrepancies and display problems between maps in a Web page >> generated through OL Javascript code and maps generated from Geoserver >> using the format="application/openlayers". >> >> Here the code I am using to generate my map through JS code (Sorry >> everything is on my development server and can not be accessed from >> outside): >> >> var myMap = new >> OpenLayers.Map('mapResourceFIRMS',{numZoomLevels:24,projection: >> "EPSG:4326" }); >> >> myMap.addControl(new >> OpenLayers.Control.LayerSwitcher({'ascending':true})); >> myMap.addControl(new OpenLayers.Control.OverviewMap()); >> >> var wms = new OpenLayers.Layer.WMS("All >> Areas","http://193.43.36.236:8080/geoserver/wms?service=wms", >> >> {layers:'fifao:FAO_DIVISION'},{wrapDateLine: true} >> ); >> wms.addOptions({isBaseLayer: true}); >> >> var wms_continent = new >> OpenLayers.Layer.WMS("Continent","http://193.43.36.236:8080/geoserver/wms?service=wms", >> {layers: >> 'fifao:CONTINENTS_LN1', >> >> transparent:"true"},{wrapDateLine: true} >> ); >> wms_continent.addOptions({isBaseLayer: false}); >> >> myMap.addLayer(wms); >> myMap.addLayer(wms_continent); >> myMap.zoomToMaxExtent(); >> >> I obtain a map which works correctly but when i zoomed in, it always takes >> 10 seconds to display the new extended view. >> >> On this other hand, when i use the openlayer format of Geoserver through: >> http://193.43.36.236:8080/geoserver/wms?bbox=-198.0,-97,198.0,99&styles=&Format=application/openlayers&request=GetMap&version=1.1.1&layers=fifao:FAO_DIVISION,fifao:CONTINENTS_LN1&width=600&height=290&srs=EPSG:4326 >> I obtain the same kind of map with less functionnalities but when i zoom >> in, it is displayed automatically, very smoothly. No additional delay is >> required to display the zoomed view. >> >> >> Moreover i have a problem of display: When i zoom in on specific polygons >> in the map based on OpenLayers JS library in my Web page, these polygons >> are not correctly represented: >> http://www.nabble.com/file/p17364274/Untitled-2%2Bcopy.jpg >> : See in red the limits of the polygons which are missing. >> >> Here, an screenshot of the same area from a map generated from Geoserver >> using the "application/openlayers" format and having the correct border >> for the polygons: >> http://www.nabble.com/file/p17364274/Untitled-4%2Bcopy.jpg >> >> I don't understand why 2 maps showing the same data which should be based >> on the same mechanism, behave so differently in term of loading >> performance and layers display. In fact, I would like to have my map >> nested in my web page and built using Openlayers JS code behaving the same >> as the one which can be generated through GeoServer. >> >> Moreover, if you have any hints or tricks for improving the speed of >> display when zooming, i would be very interested. >> >> Hope it is clear enough. >> >> Thanks >> >> Sylvain >> > > -- > View this message in context: > http://www.nabble.com/Behaviour-discrepancies-between-maps-%28application-openlayers-from-GeoServer-VS-OpenLayers-JS-code%29-tp17364274p17410841.html > Sent from the OpenLayers Users mailing list archive at Nabble.com. > > _______________________________________________ > Users mailing list > Users@openlayers.org > http://openlayers.org/mailman/listinfo/users > _______________________________________________ Users mailing list Users@openlayers.org http://openlayers.org/mailman/listinfo/users