For those who have similar problem, there is actually a work around http://n2.nabble.com/Tiles-outside-maxExtent-being-loaded-td1829360.html#a1829361 posted earlier on this forum , which overcomes the request for tiles outside the maxExtent by creating a subclass of OpenLayers.Layer.WMS and overriding the getURL() method. The new method checks the latitude bounds, setting the URL to that of a fixed blank image if out of bounds. Thank you Jon!
Sige wrote: > > I found that wrapDateLine tries to request > http://maps.geonet.org.nz/tilecache/tilecache.py?LAYERS=nasagm&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&EXCEPTIONS=application%2Fvnd.ogc.se_inimage&FORMAT=image%2Fjpeg&SRS=EPSG%3A4326&BBOX=-90,-270,0,-180&WIDTH=256&HEIGHT=256 > map tiles outside the map extent , such as: > [-90.0, -270.0, 0.0, -180.0], which our tilecache server is unable to > retrieve and responds with an error message: > > An error occurred: couldn't calculate tile index for layer nasagm from > ([0.0, -270.0, 90.0, -180.0]) > File "/usr/local/tilecache/TileCache/Service.py", line 421, in > modPythonHandler > host ) > > While the WMS server of metacarta is able to handle such > http://labs.metacarta.com/wms/vmap0?LAYERS=basic&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&EXCEPTIONS=application%2Fvnd.ogc.se_inimage&FORMAT=image%2Fjpeg&SRS=EPSG%3A4326&BBOX=-90,-270,0,-180&WIDTH=256&HEIGHT=256 > request , and responds with an empty blue tile, I guess this might be the > reason for the problem mentioned in my previous post. What should I do on > the tilecache server side to handle request outside the map extent? > > Sige > > > > > Sige wrote: >> >> Hi List, >> >> I am trying to make my wms (tilecached) map wrapped across the date line, >> like: >> >> var map = new OpenLayers.Map( $('map'), >> { >> maxResolution: 0.3515625, >> projection: 'EPSG:4326' >> } >> ); >> var wms = new OpenLayers.Layer.WMS( >> "WMS/Tilecache", >> "http://maps.geonet.org.nz/tilecache/tilecache.py?";, >> { >> format: 'image/png', >> projection: 'EPSG:4326', >> units: 'degrees', >> maxResolution: 0.3515625, >> layers: 'nasagm', >> isBaseLayer: true, >> reproject: false, >> buffer: 1 >> }, >> {wrapDateLine: true, reproject: false} >> ); >> map.addLayer(wms); >> map.addControl(new OpenLayers.Control.MousePosition()); >> map.zoomToMaxExtent(); >> >> The map wrapped well, however, when I pan and zoom the map around, part >> of the map or the whole map becomes opaque (like covered by a white >> film). I am not sure if this is caused by my wms (tilecache) or >> wrapDateLine. The WMS map works fine without wrapDateLine. >> >> I have also tried the WMS from metacarta.com (mapServer) which works >> fine: >> var wms1 = new OpenLayers.Layer.WMS( "OpenLayers >> Basic",//MapServer >> "http://labs.metacarta.com/wms/vmap0";, >> {layers: 'basic'}, >> {wrapDateLine: true} ); >> map.addLayers([ wms1]); >> >> Thanks, >> >> Sige >> > > -- View this message in context: http://n2.nabble.com/wrapDateLine-with-WMS-map-covered-by-opaque-film-tp4016174p4067382.html Sent from the OpenLayers Users mailing list archive at Nabble.com. _______________________________________________ Users mailing list [email protected] http://openlayers.org/mailman/listinfo/users
