Re: [Qgis-user] select elements from a wms layer
Hi, Not sure if I understand you correctly, but a WFS SHOULD be selectable in QGIS. Try the 'rijkswaterstaat'-url below, and you can select 1 province, and via the attribute table copy WKT to the clipboard: wkt_geom,MPPerimete,MPArea,AREA,PERIMETER,OMSCHR,GAQ,NL MULTIPOLYGON(((149480.042914 476598.605781,149482.755927 ... a LOT of coordinates here ... 476598.605781))),265264,143640,1436408320.,265278.25000,Utrecht,10,0 But if it is only the LABELS that you actually want to copy, it's different. Labelplacement is done using the geographic object it's attached to. First I thought that you maybe could transform your original layer to a point-layer, but in that way you do not have the exact same label locations as before. But having a pointlayer with labels, they should be selectable, thereby copyable. Another option?? in arcview it was/is(?) possible to transform a labels to a 'graphic'... Regards, Richard Duivenvoorde José María Michia wrote: With WFS I've come close to what I need. The problem is that WFS does not work with layers of labels. I've changed the geometry type, to polygon, without style, and with label, and i can display this layer in QGIS. I've inserted this WFS layer in QGIS. And, at certain scale, QGIS show only the labels that i want to write out. So, QGIS display the data that i wish to write to some GIS file. But, QGIS not let me select elementos from WFS/WMS layers. Selection tools is deactivated. And i cannot found any way of convert to gis format. Only found a way to convert it to image. Using QGIS, with both WMS and WFS layers, the selection tool is deactivated. I can not select elements of these layers. With other layer formats, the tool is activated, and I can select elements. Is correct this behavior? If you want to try out a WFS: use this url: http://www.rijkswaterstaat.nl/services/geoservices/overzichtskaartnl?service=WFStypename=NL-provversion=1.0.0 you will be able to receive provinces, highways etc from the Netherlands. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] select elements from a wms layer
José María Michia wrote: Hi all I want to export a sub region of a WMS layer, but the selection tool is not enabled when a layer WMS is active. Is it not possible to select elements of a WMS layer? Hi José, what do you exactly mean by 'export a sub region'? A WMS-layer is a flat image. That is whenever you zoomin or pan, a new png/gif/jpeg image is requested from a WMS-server (http://en.wikipedia.org/wiki/Web_Map_Service) and shown in your map. But this means that the underlying data is NOT available for QGIS, while it off course is when you are showing shapefile or postgis data. So there is (besides exporting it to an image) not so much to export I think. It is however possible (if the WMS-layer is 'queryable'), to fire getFeatureInfo-requests to the WMS-server. Using the I-tool, you can click on the WMS-layer, an x,y is sent to the WMS-server and the server will then sent back the attributes of one or more features that are laying on that x,y. This is possible because the WMS-server DOES have the data with which it 'paints' the map images. Another option is to use a WFS-layer (mind the F). A webFEATUREserver (http://en.wikipedia.org/wiki/Web_Feature_Service) There is a plugin available for those. Sometimes a WMS is also configures as a WFS. A WFS will return 'features' (that is the geometric objects including attributes) as gml. Qgis is then able to generate a map based on this data, and the different objects are selectable. If you want to try out a WFS: use this url: http://www.rijkswaterstaat.nl/services/geoservices/overzichtskaartnl?service=WFStypename=NL-provversion=1.0.0 you will be able to receive provinces, highways etc from the Netherlands. Regards, Richard Duivenvoorde ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] select elements from a wms layer
Hi José On Thu, 2008-11-20 at 12:37 -0300, José María Michia wrote: Hi all I want to export a sub region of a WMS layer, but the selection tool is not enabled when a layer WMS is active. Is it not possible to select elements of a WMS layer? QGIS does not yet support selection of rasters (and there are no immediate plans for this). That said it would be quite interesting to be able to do a rectangular selection on a raster and then right click the image and say save selection as which would then save that area as a georeferenced imageone for you to add as an enhancement request to trac I guess :-) Regards Tim Thanks for any advice. José María ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user -- Tim Sutton - QGIS Project Steering Committee Member (Release Manager) == Visit http://linfiniti.com to find out about: * QGIS programming services * Mapserver and PostGIS based hosting plans * FOSS Consulting Support Services Skype: timlinux Irc: timlinux on #qgis at freenode.net == signature.asc Description: This is a digitally signed message part ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] select elements from a wms layer
2008/11/20 Richard Duivenvoorde [EMAIL PROTECTED]: José María Michia wrote: Hi all I want to export a sub region of a WMS layer, but the selection tool is not enabled when a layer WMS is active. Is it not possible to select elements of a WMS layer? Hi José, what do you exactly mean by 'export a sub region'? I mean export as GIS format, including geometry and attributes (at least, an ID or LABEL FIELD). A WMS-layer is a flat image. That is whenever you zoomin or pan, a new png/gif/jpeg image is requested from a WMS-server (http://en.wikipedia.org/wiki/Web_Map_Service) and shown in your map. But this means that the underlying data is NOT available for QGIS, while it off course is when you are showing shapefile or postgis data. So there is (besides exporting it to an image) not so much to export I think. Yes. I like the labeling offered by MapServer, and I've used MapServer for my work. But now, i'm exploring GMT for printed maps. GMT is great for map production, but no have implented a labeling algorithm. For the first attempts, I used the labels of MapServer exported in PDF format. By using Inkscape, I have combined these PDF files with PS files generated by GMT. Maybe this is the best way of making this. It is however possible (if the WMS-layer is 'queryable'), to fire getFeatureInfo-requests to the WMS-server. Using the I-tool, you can click on the WMS-layer, an x,y is sent to the WMS-server and the server will then sent back the attributes of one or more features that are laying on that x,y. This is possible because the WMS-server DOES have the data with which it 'paints' the map images. Another option is to use a WFS-layer (mind the F). A webFEATUREserver (http://en.wikipedia.org/wiki/Web_Feature_Service) There is a plugin available for those. Sometimes a WMS is also configures as a WFS. A WFS will return 'features' (that is the geometric objects including attributes) as gml. Qgis is then able to generate a map based on this data, and the different objects are selectable. Querying features, use all elements of the layer, even deleted items for the cartographic generalization made by MapServer. Therefore, it is not what I'm looking for. With WFS I've come close to what I need. The problem is that WFS does not work with layers of labels. I've changed the geometry type, to polygon, without style, and with label, and i can display this layer in QGIS. I've inserted this WFS layer in QGIS. And, at certain scale, QGIS show only the labels that i want to write out. So, QGIS display the data that i wish to write to some GIS file. But, QGIS not let me select elementos from WFS/WMS layers. Selection tools is deactivated. And i cannot found any way of convert to gis format. Only found a way to convert it to image. Using QGIS, with both WMS and WFS layers, the selection tool is deactivated. I can not select elements of these layers. With other layer formats, the tool is activated, and I can select elements. Is correct this behavior? If you want to try out a WFS: use this url: http://www.rijkswaterstaat.nl/services/geoservices/overzichtskaartnl?service=WFStypename=NL-provversion=1.0.0 you will be able to receive provinces, highways etc from the Netherlands. Yes, I've configured my ANNOTATION/LABEL layers as WFS and WMS layers. And is cool, but anyway, Yes, I have set my ANNOTATIONS/LABEL layers, as WFS/WMS layers, but still I could not take advantage of this to achieve the objective. Regards, Richard Duivenvoorde Thanks Richards, saludos para ti y todos los usuarios de QGIS. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
