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I want to display a vector layer in openlayers. Users can scale the map before they load the vector layer and I'd like to simplify the geometry with st_simplify before sending it to the client.

Does anyone have a simple formula I can use to calculate an appropriate st_simplify tolerance based on the map's properties (eg zoom, scale or extent?)?

(I don't think this is relevant but have a php middle layer and am passing the layer as kml)

I've googled around and maybe I'm looking the wrong way because I can't believe i'm the first one with this question!

thanks in advance!

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