[OSGeo-Discuss] Proposal: OSGeo Cartographic Library

Bart van den Eijnden (OSGIS) bartvde at osgis.nl
Tue Apr 15 09:47:39 PDT 2008

One addition to what Chris points out, to complicate things :-), SVG 
vector symbols can also be used inside an SLD document (for a Mark).

To be even more precise, we are really talking about the Symbology 
Encoding (SE) spec here. SLD as of version 1.1 only deals with the 
integration of symbology encoding into WMS. Symbology (and the rules) 
was taken out of SLD since it is more generic than only WMS. But most 
current implementations still use SLD 1.0 where all is in one spec.


Best regards,

Christopher Schmidt wrote:
> On Tue, Apr 15, 2008 at 06:53:19PM +0300, Ari Jolma wrote:
>> Frank Warmerdam kirjoitti:
>>> In my opinion we would be better off starting with a widely accepted
>>> standard like SLD as a basis of a feature styling standard
>> I'm right now looking at SVG. It is a full graphics description 
>> language, but maybe the styling information could be somehow picked out 
>> an reused for our purposes. SVG is becoming more popular and for example 
>> many symbol sets (also mapping symbols) are already in SVG. Thus we'd 
>> also need tools for parsing SVG.
> SVG *isn't* a rule language: SVG is one possible output of taking a Rule
> language (SLD), combining it with geography and attributes (GML,
> Shapefile, what have you), and creating a final product.
> Other products could include raster images  (PNG, JPG), Other vector
> formats (VML, Canvas in the browser, PDF, PS, .ai), or encodings into
> things like KML.
>> If the stylings that are distributed with geodatasets are SVG, then 
>> producing SVG maps would be easier, wouldn't it?
> I'm not sure this really makes sense. 
> SVG is a style language. SLD is a Rule language. SLD is the source: SVG
> is the destination (one of many).
> Regards,

Bart van den Eijnden
OSGIS, Open Source GIS
bartvde at osgis.nl

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