[Mapcss] MapCSS 0.2 finalization - zoom levels

Richard Fairhurst richard at systemeD.net
Tue May 1 14:59:37 BST 2012

On 01/05/2012 14:47, Paul Hartmann wrote:
> In my opinion, it should be the same in MapCSS and the definition of the
> zoom selector should be based on map scale rather than on the projected
> coordinates in the Mercator projection.

My long-term intention for the zoom selector was that "z" would not be 
the only way of specifying a zoom level, but that we could also have "s" 
for a standard ratio scale.


|z14-18        # "900913" zooms 14-18
|s25000-50000  # 1:25k to 1:50k

I think we absolutely need to keep the z selector as it is. Otherwise, 
there is no way to work out what features to include in a simplified 
database for small-scale rendering, bearing in mind that 900913 maps 
represent 90% of the webmaps in use today. But offering an alternative 
for those who want it makes sense to me.


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