Hi, perhaps these three examples may be helpful.
In the first and the second example I use a LayerSwitcher, where the user can choose the layers of an OpenLayers.Layer.WMS for display. The third example shows the use of SLD to color a layer for different attributes. [1]:http://gis.ibbeck.de/ginfo/apps/OLExamples/OL27/examples/GroundOverlay/G roundOverlay.asp [2]:http://gis.ibbeck.de/OLClient/OLClient.asp?WMC=data/WMC/!World.wmc.xml [3]:http://gis.ibbeck.de/ginfo/apps/OLExamples/OL210/MapServer_SLD_World/Map Server_SLD_World.asp Regards, Arnd _____ Von: [email protected] [mailto:[email protected]] Im Auftrag von Andreas Forø Tollefsen Gesendet: Freitag, 19. September 2014 20:02 An: Mark Prins Cc: openlayers-users Betreff: Re: [OpenLayers-Users] Too many layers? Thanks for all your input. Really, this seems to be an issue with how we can use OpenLayers to visualize a number of variables from the same layer. In fact, my data is all from just two shapefiles representing two different administrative units, with many variables for each layer. This should basically only require me to have two layers in the map. One for each administrative level. What I would like to have is just a simple "variable selector" for each of the layer, where the user can select the variable in each of the layers that should be symbolized, where each variable has a predefined SLD style. However, I have not seen an example showing this, or seen code examples. Is this possible in Openlayers without too much custom coding? It seems to me sometimes that Openlayers is not always easy to use to create thematic maps. My solution to reduce the load is to have a custom LayerSwitcher, where only one layer can be shown as overlay at the time. Andreas 2014-09-19 15:51 GMT+02:00 Mark Prins <[email protected]>: in this specific case I think you should really (re)think your user interaction design. Think about: - Do you really want a user to be able to switch on all these layers at the same time? - Does the map still make sense if there are more than 3 layers selected (especially if they overlap)? - Is there any way to reduce the options by combining several areas into one layer? We came up with a megamenu structure (basically a list selector) for mapping a few hundred statistical units in our project see: https://github.com/MinELenI/CBSviewer/blob/master/src/main/webapp/WEB-INF/js p/main_menu_theme_include.jsp 2014-09-18 7:51 GMT+02:00 Andreas Forø Tollefsen <[email protected]>: > Hi, > > I am working on a thematic mapping platform showing data at local > administrative levels. > I have many layers, so I run into problems (see screenshot: > http://gisintersect.com/many_layers.png). > > Is there any way I can collapse groups of layers within the layer switcher? > I have a high number of layers, as you can see in the switcher. Hence, I > need some way to collapse/group/categorize the layers, so that I do not need > to show all of them in the layerswitcher at once. > The result is that layers drop outside the map, so either, there is a > maximum number of layers, or there should be a better way to do it. > > Andreas > > _______________________________________________ > Users mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/openlayers-users -- Disclaimer; This message is just a reflection of what I thought at the time of sending. The message may contain information that is not intended for you or that you don't understand. _______________________________________________ Users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/openlayers-users --- Diese E-Mail ist frei von Viren und Malware, denn der avast! Antivirus Schutz ist aktiv. http://www.avast.com
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