Chris Browet wrote:
Zoom levels are fine (as an alternative, IMHO) if they are very clearly
defined in a generic/projection agnostic manner AND if scales are defined
too.
The only generally "recognized" zoom levels are map scales (e.g. 1:5000)
which are clear and precise for everyone. When you buy a printed map, the
scale is not defined by a zoom level ;-)
Yep, but most web maps are delivered in a tiled format into a
resolution-dependent browser. In other words, the renderer has no idea
what scale the map will be shown at. If I serve a bunch of standard
900913 tiles at z15, I don't know whether the user will be looking at
them on a 72dpi monitor, a 96dpi monitor, or whatever - and that
affects the scale.
I'd suggest that we standardise on a choice of:
|z13 - means standard 900913 zoom level
|s2500 - means 1:2,500 scale
Renderers should support at a minimum the |s format; the |z format is
advisable if they are likely to be used in a web mapping context.
Renderers should make the best judgement as to scale/zoom mappings
based on the information available to them.
cheers
Richard
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