Hello Arnd, Thank you for your continuous effort to help me work through this. I'm not so sure where you said "You should control the extent of your data, which you make availible through GeoServer." In GeoServer, if I select any other EPSG other than 4008, the layer does not display correctly. By default my map is 900913 because I use Open Street Map and Google as my base layers. I'm very surprised that specifying the projection has no effect as I've seen in the proj4js docs that it should be included...
Setting the projection of a layer ¶<http://trac.osgeo.org/openlayers/wiki/Documentation/Dev/proj4js#Settingtheprojectionofalayer> If the layer's projection is different from the one used by the map, you need to specify what projection that is: var layer = new OpenLayers.Layer.GML(geojsonUrl, {format:OpenLayers.Format.GeoJSON, projection: new OpenLayers.Projection("EPSG:28993")}); map.addLayer(layer); http://trac.osgeo.org/openlayers/wiki/Documentation/Dev/proj4js I'm sorry for not understanding very well what to do next. When you say that you think my problem is the data I want to display, could it mean that it might be impossible to display this data on my map? Thank you very much for explaining all this to me, elshae On Wed, Dec 22, 2010 at 4:12 PM, Arnd Wippermann <[email protected]>wrote: > Hi, > > var bounds = new OpenLayers.Bounds( > -2880104.25, 2070327.125, > -1038944.658, 3262434.769 > ); > surely describe nothing in degree. A map in degree units goes from -180 W > to +180 E and -90 S to 90 N. A resolution of 7192 means, that one pixel > displays an area of 7192 x 7192 square units, what is much more than 360x180 > for the whole world in degree. It seems, that the data, which are displayed > with GeoServer Preview, are not in degree and perhaps not in EPSG:4008 with > the parameter "+proj=longlat +ellps=clrk66 +no_defs". You should control > the extent of your data, which you make availible through GeoServer. > > By default is your map in EPSG:4326 as you create the map without a > projection in the map options. > > Also has it no effect, if you add projection: "EPSG:4008" as a param to > your WMS declaration. The WMS request get added SRS=EPSG:4326 as it is the > map projection. > > I think the problem are the data, you want to display. > > Arnd > > > > ------------------------------ > *Von:* IT Intern [mailto:[email protected]] > *Gesendet:* Mittwoch, 22. Dezember 2010 16:34 > *An:* Arnd Wippermann > *Cc:* [email protected] > > *Betreff:* Re: [OpenLayers-Users] Re: EPSG:4008 Layer Not Displaying > > Hello Arnd, > > I tried out your suggestion but I am still at a lost here. I happened not > to get any error messages, but my layer didn't appear at all when I changed > these params. I tried with SRS 4326 and 900913 since my map has base layers > of 900913 and overlays of 4326. I also changed the bbox to -20037508.34, > -20037508.34, 20037508.34, 20037508.34 (the bbox of my current map). I also > notice that for this EPSG:4008 layer I see > -2369470.14441, 2720321.16942 > Scale = 1 : 2854176M > > as opposed to another layer of mine (EPSG:4326) on my map which shows > 98.29099, 28.50735 > Scale = 1 : 2M > > In it's GeoServer preview. So at this point I'm assuming it has something > to do with the scale of my layer.. > > In the OpenLayers code of the GeoServer preview, they have: > > var bounds = new OpenLayers.Bounds( > -2880104.25, 2070327.125, > -1038944.658, 3262434.769 > ); > var options = { > controls: [], > > maxExtent: bounds, > maxResolution: 7192.02965625, > projection: "EPSG:4008", > units: 'degrees' > }; > > map = new OpenLayers.Map('map', options); > > // setup tiled layer > tiled = new OpenLayers.Layer.WMS( > "sedac - Tiled", "http://localhost:8080/geoserver/wms";, > > { > height: '331', > width: '512', > layers: 'cite:sedac', > styles: '', > > srs: 'EPSG:4008', > format: format, > tiled: 'true', > tilesOrigin : map.maxExtent.left + ',' + > map.maxExtent.bottom > > }, > { > buffer: 0, > displayOutsideMaxExtent: true > } > ); > > // setup single tiled layer > > untiled = new OpenLayers.Layer.WMS( > "sedac - Untiled", "http://localhost:8080/geoserver/wms";, > { > > height: '331', > width: '512', > layers: 'cite:sedac', > styles: '', > srs: 'EPSG:4008', > > format: format > }, > {singleTile: true, ratio: 1} > ); > > map.addLayers([untiled, tiled]); > > I instead, set the params they have for their map in my layer because if I > set my map specific to this layer, other layers won't work as expected... > > For the map I have: > > var options = { > controls: [new OpenLayers.Control.Navigation()], > //Needed to use GeoExt controls such as the zoomslider > maxExtent: new OpenLayers.Bounds(-20037508.34, > -20037508.34, 20037508.34, 20037508.34), > > units: 'm', > allOverlays: false //Do not display all layers on load > } > > var map = new OpenLayers.Map(options); > > and for my EPSG:4008 layer I have: > > var bounds = new OpenLayers.Bounds(-2880104.25, 2070327.125, -1038944.658, > 3262434.769); > var borders = new OpenLayers.Layer.WMS( > "Borders", "http://localhost:8080/geoserver/wms";, {id: > 'borders', layers: 'cite:sedac', transparent: true, maxExtent: bounds, > maxResolution: 7192.02965625, projection: "EPSG:4008", units: 'degrees'}, > {isBaseLayer: false, displayInLayerSwitcher: true, visibility: true, > displayOutsideMaxExtent: true} > > ); > > Any further help would be greatly appreciated :) > > Thank you, > > elshae > > > > > On Tue, Dec 21, 2010 at 6:09 PM, Arnd Wippermann > <[email protected]>wrote: > >> Hi, >> >> build the WMS request for your layer and test it in the browser. Change >> the BBOX, SRS. Perhaps you get some error message. >> >> >> http://localhost:8080/geoserver/wms?LAYERS=cite%3Asedac&FORMAT=image%2Fpng&VERSION=1.1.1&TRANSPARENT=true&SERVICE=WMS&REQUEST=GetMap&STYLES=&EXCEPTIONS=application%2Fvnd.ogc.se_inimage&SRS=EPSG%3A4326&BBOX=-153.599297,-105.360751,165.451558,97.517659&WIDTH=942&HEIGHT=599 >> >> Arnd >> >> ------------------------------ >> *Von:* IT Intern [mailto:[email protected]] >> *Gesendet:* Dienstag, 21. Dezember 2010 23:19 >> *An:* Arnd Wippermann >> *Betreff:* Re: [OpenLayers-Users] Re: EPSG:4008 Layer Not Displaying >> >> Hi Arnd, thanks for your reply! Unfortunately that has not solved the >> problem for me :( >> >> I set the bounds both on my map and layer individually and still that >> layer does not display. >> >> I've also tried with the bounds I obtained from GeoServer, again no luck >> :-/ >> >> var borders = new OpenLayers.Layer.WMS( >> "Borders", "http://localhost:8080/geoserver/wms";, >> {id: 'borders', layers: 'cite:sedac', transparent: true, maxExtent: new >> OpenLayers.Bounds(-2880104.25, 2070327.125, -1038944.658, 3262434.769), >> projection: new OpenLayers.Projection('EPSG:4008'), units: 'm'}, >> {isBaseLayer: false, displayInLayerSwitcher: true, visibility: true, >> displayOutsideMaxExtent: true} >> ); >> >> I still don't see why it is not working ... >> >> Many Thanks, >> >> elshae >> >> On Tue, Dec 21, 2010 at 2:28 PM, Arnd Wippermann >> <[email protected]>wrote: >> >>> Hi, >>> >>> I would think, that the maxExtent is the part to change. >>> >>> Your map projection is EPSG:4326 by default, and EPSG:4008 is also a >>> projection in longlat. >>> >>> With your maxExtent the visible response of the WMS are only a pixel. >>> >>> Try a maxExtent of -180,-90,180,90. Perhaps it solves your problem. >>> >>> Arnd >>> >>> -----Ursprüngliche Nachricht----- >>> Von: [email protected] >>> [mailto:[email protected]] Im Auftrag von elshae >>> Gesendet: Dienstag, 21. Dezember 2010 15:50 >>> An: [email protected] >>> Betreff: [OpenLayers-Users] Re: EPSG:4008 Layer Not Displaying >>> >>> >>> Thank you so much for the kind support. I see that this is definitely >>> going >>> in the right direction, but I am still not able to get it working. >>> >>> In my body tag I have the scripts >>> >>> <script src="./OpenLayers-2.10/OpenLayers.js"></script> >>> <script src="./proj4js/lib/proj4js-combined.js"></script> //I did also >>> try >>> proj4js.js, but the docs said use this one? >>> >>> Then I have these before my map and layer declaration, also in the body >>> tag >>> >>> Ext.onReady(function() { >>> >>> Proj4js.defs["EPSG:4008"] = "+proj=longlat +ellps=clrk66 >>> +no_defs"; >>> Proj4js.defs["SR-ORG:6627"] = "+proj=merc +lon_0=0 +k=1 +x_0=0 >>> +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs"; >>> Proj4js.defs["EPSG:4326"] = "+proj=longlat +ellps=WGS84 >>> +datum=WGS84 +no_defs"; >>> >>> ... >>> ... >>> >>> >>> //Map properties >>> var options = { >>> controls: [new OpenLayers.Control.Navigation()], >>> //Needed to use GeoExt controls such as the zoomslider >>> maxExtent: new OpenLayers.Bounds(-20037508.34, >>> -20037508.34, 20037508.34, 20037508.34), >>> units: 'm', >>> allOverlays: false //Do not display all layers on load >>> } >>> >>> var map = new OpenLayers.Map(options); >>> >>> var borders = new OpenLayers.Layer.WMS( >>> "Borders", "http://localhost:8080/geoserver/wms";, >>> {id: >>> 'borders', layers: 'cite:sedac', transparent: true, projection: new >>> OpenLayers.Projection("EPSG:4008")}, {isBaseLayer: false, >>> displayInLayerSwitcher: true, visibility: true} >>> ); >>> >>> >>> Still nothing shows up :(. Am I doing something wrong? I'm not seeing >>> the >>> error... >>> >>> Thank you very much for your time, >>> >>> elshae >>> -- >>> View this message in context: >>> >>> http://osgeo-org.1803224.n2.nabble.com/EPSG-4008-Layer-Not-Displaying-tp5838 >>> 081p5855542.html >>> Sent from the OpenLayers Users mailing list archive at Nabble.com. >>> _______________________________________________ >>> Users mailing list >>> [email protected] >>> http://lists.osgeo.org/mailman/listinfo/openlayers-users >>> >>> >> >
_______________________________________________ Users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/openlayers-users
