Hello, If there is something I am doing incorrectly in trying to access the railway_30m layer (below) transparently, please let me know. Otherwise, I thought this was something I should draw someone's attention to.
Although this item is somewhat related to http://n2.nabble.com/WMS-transparent-TRUE-versus-true-td1823416.html#a1823416 and http://trac.openlayers.org/ticket/678 (which was, I believe, submitted to address the problem reported in the first link), I don't believe those items dealt with actually trying to set transparency on a WMS layer as suggested. In OpenLayers 2.8, given the following example: var options = { projection: "EPSG:4269", maxExtent: new OpenLayers.Bounds(-135, 38, -50, 78), }; this.map = new OpenLayers.Map('map', options ); var CTISwms = new OpenLayers.Layer.WMS( "CTI-S WMS", "http://wms.sst-sw.rncan.gc.ca/wms/toporama_en", {layers: 'railway_30m', format: 'image/png'}, {isBaseLayer: false, visibility: true, transitionEffect: 'resize'}); this.map.addLayers([CTISwms]); var CTIS_wms_limits = new OpenLayers.Layer.WMS( "CTI-S WMS, limits", "http://wms.sst-sw.rncan.gc.ca/wms/toporama_en", {layers: 'limits', format: 'image/png'}, {isBaseLayer: true, visibility: true, transitionEffect: 'resize'}); this.map.addLayers([CTIS_wms_limits]); this.map.zoomToMaxExtent(); I have been unable to set the railway_30m layer to be transparent using any of the following syntax: var CTISwms = new OpenLayers.Layer.WMS( "CTI-S WMS", "http://wms.sst-sw.rncan.gc.ca/wms/toporama_en", {layers: 'railway_30m', format: 'image/png'}, {isBaseLayer: false, transparent: true, visibility: true, transitionEffect: 'resize'}); var CTISwms = new OpenLayers.Layer.WMS( "CTI-S WMS", "http://wms.sst-sw.rncan.gc.ca/wms/toporama_en", {layers: 'railway_30m', format: 'image/png'}, {isBaseLayer: false, transparent: "true", visibility: true, transitionEffect: 'resize'}); var CTISwms = new OpenLayers.Layer.WMS( "CTI-S WMS", "http://wms.sst-sw.rncan.gc.ca/wms/toporama_en", {layers: 'railway_30m', format: 'image/png'}, {isBaseLayer: false, visibility: true, transitionEffect: 'resize', params: {TRANSPARENT: true}}); var CTISwms = new OpenLayers.Layer.WMS( "CTI-S WMS", "http://wms.sst-sw.rncan.gc.ca/wms/toporama_en", {layers: 'railway_30m', format: 'image/png'}, {isBaseLayer: false, visibility: true, transitionEffect: 'resize', params: {TRANSPARENT: "true"}}); None of the above will actually send the TRANSPARENT parameter in the request to the WMS service. The only way I was able to get the request to be sent with that parameter and to get the layer to display transparently was as follows: var CTISwms = new OpenLayers.Layer.WMS( "CTI-S WMS", "http://wms.sst-sw.rncan.gc.ca/wms/toporama_en?transparent=true", {layers: 'railway_30m', format: 'image/png'}, {isBaseLayer: false, visibility: true, transitionEffect: 'resize'}); Also, I noticed while investigating this that both WMS.js and ArcGIS93Rest.js assume that params.TRANSPARENT is a string and do not handle boolean anymore as suggested by the fix noted above. -- View this message in context: http://n2.nabble.com/transparent-param-not-sent-to-WMS-service-tp3615475p3615475.html Sent from the OpenLayers Users mailing list archive at Nabble.com. _______________________________________________ Users mailing list Users@openlayers.org http://openlayers.org/mailman/listinfo/users