Skip to main content

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [List Home]
Re: [udig-devel] wmt distortion

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?

Jody

On 02/10/2010, at 2:38 AM, Craig Taverner wrote:

It is curious to see that in the first set of images, the labeling is dramatically offset (not just image distortion), so it seems they are different images from the server (different zoom levels), while in the latest screenshots the images are identical, except the uDig one appears to have been scaled a tiny fraction smaller, causing the text labeling to loose clarity.

I wonder if the final fix is to make sure that the images displayed on the screen are rendered at exactly the same resolution as the generated tiles really are, so no visual scaling occurs? Since you seem to to be using a zoom level switcher, it indicates (to me at least) that uDig is supposed to be choosing zoom levels that match the tile render resolution. Perhaps there is a small bug in that code?

On Fri, Oct 1, 2010 at 4:41 PM, andrea antonello <andrea.antonello@xxxxxxxxx> wrote:
:) Thanks Ian!
That made the trick of the stretching part. Anyways, even when
sticking to the predefined zoomlevels, the rendering is still not
perfect (see attached).
But at least much better.

Andrea



On Fri, Oct 1, 2010 at 4:34 PM, Ian Turton <ijturton@xxxxxxxxx> wrote:
> On Fri, Oct 1, 2010 at 8:42 AM, andrea antonello
> <andrea.antonello@xxxxxxxxx> wrote:
>> When loading the default mapnik maps, I see a distortion in the map.
>> If I overlay data, they seem ok, so I am guessing a distortion coming
>> from reprojection.
>> Anyone aware what crs is used? I am trying 4326 with the attached
>> result (in background the browser openstreetmap.
>
> I'm pretty sure that all the OSM maps from mapnik are in 900913 - a
> bad choice but these neo's know no better :-)
>
> Ian
>
> --
> Ian Turton
> _______________________________________________
> User-friendly Desktop Internet GIS (uDig)
> http://udig.refractions.net
> http://lists.refractions.net/mailman/listinfo/udig-devel
>

_______________________________________________
User-friendly Desktop Internet GIS (uDig)
http://udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel


_______________________________________________
User-friendly Desktop Internet GIS (uDig)
http://udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel


Back to the top