[OpenLayers-Users] Behaviour discrepancies between maps (application/openlayers from GeoServer VS OpenLayers JS code)

[springrider]

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
> 

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