[OpenLayers-Users] Proportional Symbol Mapping
Bjorn Sandvik
B.Sandvik at sms.ed.ac.uk
Sat Apr 5 15:01:37 EDT 2008
Hi David,
I will consider thematic mapping with WMS at a later stage.
"European Interactive Atlas Explorer" is a good example:
http://karlinapp.ethz.ch/wms_client/
The disadvantage is lack of interactivity on the client.
Bjorn
http://blog.thematicmapping.org
David Fawcett wrote:
> I can think of another option, but it is a fairly big change of course.
>
> Instead of sending RSS to OpenLayers and building the vector features,
> you could use MapServer to create a transparent WMS layer with your
> features in it. That way, you could use LAYER SYMBOLSCALE to scale
> your symbols.
>
> David.
>
> On Fri, Apr 4, 2008 at 5:57 AM, Christopher Schmidt
> <crschmidt at metacarta.com <mailto:crschmidt at metacarta.com>> wrote:
>
> On Fri, Apr 04, 2008 at 10:48:09AM +0200, Eric Lemoine wrote:
> > On Thu, Apr 3, 2008 at 11:05 PM, Bjorn Sandvik
> <B.Sandvik at sms.ed.ac.uk <mailto:B.Sandvik at sms.ed.ac.uk>> wrote:
> > > My question: Is there a way to keep the relative size of the
> symbols
> > > when the users zoom in/out?
> >
> > AFAICT there's no way to style features based on the current
> zoom level.
>
> I'm pretty sure that the StyleMap/Style/Rule system is designed
> exactly
> for that, but I have no idea how it's supposed to work.
>
> I would say "look at http://trac.openlayers.org/wiki/Styles", but
> I see
> that it's using Rules for styling, which I think was recently decided
> would be unsupported in OpenLayers 2.6, so I don't know what you're
> actually supposed to do.
>
> Andreas? Tim?
>
> Regards,
> --
> Christopher Schmidt
> MetaCarta
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