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Re: [udig-devel] wmt distortion
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On Tue, Oct 5, 2010 at 8:35 AM, Jody Garnett <jody.garnett@xxxxxxxxx> wrote:
> We did update the renderer interface so that tiled data sources could
> indicate specific zoom levels; that is what the zoom level switch should be
> picking up on?
> I am not sure if this information is referenced by the default zoom in and
> zoom out buttons or not? (It may of just been done for a commercial project
> emily was working on).
> I remember there being a bit of a gap between switching zoom level based on
> scale; vs using the exact resolutions defined by the tile servers. So yes I
> imagine that testing would be very helpful as we take on more tile servers?
I'm wondering if this has anything to do with the many different ways to compute
a scale. The OGC defined a simplified expression to compute the scales in
SLD that is implemented by many WMS servers (but not all, some participants
to the shootout had to fix their way to compute the scale) and afaik uDig is
using an accurate scale computation instead of the OGC suggested one.
This might explain the differences you're seeing. Or it might be something else
entirely... not sure what exactly goes on there :-p
Cheers
Andrea
-----------------------------------------------------
Ing. Andrea Aime
Senior Software Engineer
GeoSolutions S.A.S.
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