Thanks to the suggestion made by Barend Köbben I found this post http://thematicmapping.org/playground/openlayers_propsymbols_geojson.phpwhich was showing what I need.
I've altered the example and it is now running at http://www.mapwindow.org/conference/2012/usermap.html But when I put the code (not that much) in the webpage with the participants I get horizontal transparent 'lines' in my OSM base map. Because my div has a gray background the lines are gray as well. This is probably some CSS issue, but I haven't figured it out. http://www.mapwindow.org/conference/2012/participants.php Thanks all for your help and if you have a suggestion of the fix the lines let me know. Paul -- Project manager Open Source GIS Conference 2012 2012/5/15 Barend Köbben <[email protected]> > Hi Paul, > > For such a relatively simple map I would probably not even use a WxS, just > a geojson file of a simple world map and javascript to read the attributes > of how many visitors per country. You could probably use OpenLayers for > that (which I did not try myself), but other solutions too, see e.g the > example of a simple thematic maps made with the D3 library at > http://kartoweb.itc.nl/kobben/test/buurten.html > > BTW, you should of course not use a map where you color countries if a > person comes from there (a so-called choropleth or chorochromatic map). > That would greatly misdirect the user into thinking many people come from > e.g. Russia, because he sees a huge red polygon, while none seem to come > from Luxemburg (which he won't see at al at that scale). In reality maybe > 20 are from Luxemburg and only 1 from Russia. Better use proportional > point symbols per country, see ge, the map "AANT_INW" in the example > mentioned above... > > Barend > > -- > Barend Köbben > Senior Lecturer, ITC - University of Twente, > Faculty of Geo-Information Science and Earth Observation > PO Box 217, 7500AE Enschede (The Netherlands) > +31-(0)53 4874 253 > > > > > On 14-05-12 22:34, "Paul Meems" <[email protected]> wrote: > > > > > > > > >Hi, > > > >I'm working on a kind of user map. > >It should be a map with all the countries of the world and the countries > >are colored if someone from that country is coming to the Open Source GIS > >conference. > >I also need a label with the name of the country and the number of people. > > > >I have some experience with OL together with GeoServer and PostGIS, but > >for this web page I can't use that. > > > >I think I need a WFS server that has the countries of the world and then > >use a GML file with my data to create the labels and color the countries, > >am I right? > > > >I'm already stuck at the first step. Is a public WFS server available > >that I can use to do this? > > > >I've already made a static image of what I want, but I would rather use > >OL. > >Can anybody advise me on this? > > > >Here are my static images: > >http://www.mapwindow.org/conference/2012/participants.php > ><http://www.mapwindow.org/conference/2012/participants.php> > > > >Thanks, > > > >Paul > >-- > >Project manager Open Source GIS Conference 2012 > > > Faculty of Geo-Information Science and Earth Observation (ITC) > University of Twente > Chamber of Commerce: 501305360000 > > E-mail disclaimer > The information in this e-mail, including any attachments, is intended for > the addressee only. If you are not the intended recipient, you are hereby > notified that any disclosure, copying, distribution or action in relation > to the content of this information is strictly prohibited. If you have > received this e-mail by mistake, please delete the message and any > attachment and inform the sender by return e-mail. ITC accepts no liability > for any error or omission in the message content or for damage of any kind > that may arise as a result of e-mail transmission. > _______________________________________________ > Users mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/openlayers-users >
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