On 03/01/13 14:30, lysgaard wrote:
> I'm working on the Open Aviation Map project.
> We're using Geoserver for styling via SDL.
> There are several places one wants the map to scale it's detail level based
> on the zoom level.
>
> Take elevation contour lines. When zoomed in it makes sense to show
> contour lines for maybe every 50th metres, but when zoomed out,
> maybe just for every 300-500 metres.
> I understand that it would be possible to hard code all this using
> max scale denominator but this would be extremely tedious and wery
> prone to error. Does there exist any smarter way. I guess I'm looking for
> some way to do basic calculations in the style based on the scale
> denominator
> and by that calculate the values i want height curves for. Maybe SLD is the
> wrong
> way to do this altogether?
>
>
actually, you have the scale denominator as an environment variable in
SLD, see:
http://docs.geoserver.org/stable/en/user/styling/sld-extensions/substitution.html
you can use it for example in the following way:
<ogc:Function name="env">
<ogc:Literal>wms_scale_denominator</ogc:Literal>
<ogc:Literal>500000</ogc:Literal>
</ogc:Function>
where the second value is a fallback / default value
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