Re: [Qlandkartegt-users] [QMapShack]Bad scaling of TMS tiles

[Oliver E. <oli...@gm...>]

Hi Rainer,

the problem is indeed the different scaling. In QLGT the one and only
map was defining the scale. Garmin maps had a logarithmic scale similar
to the one QMapShack is using. TMS had their power of 2 scale. And
raster maps had their basic scale multiplied by the zoom level. Thus
every map had it's own scale matching it's requirements perfectly.

QMapShack allows multiple maps with different scales and projections. It
uses a logarithmic scale. See IDrawContext::scales. And you can define
the projection. See View->Setup Map View. All maps have to be
reprojected to that. This leads sometimes to a bit blurry view. For TMS
maps you even have to finetune which level to use, as this influences
the details. This is done by an extra scale. See CMapTMS.cpp line 448.

So far I haven't found a scale to display all kind of maps perfectly. If
one map is looking good there is another one that becomes blurry. But
you are welcome to play with it.

Oliver



Am 27.03.2015 um 15:06 schrieb rainerU:
> Hello,
>
> When I use a TMS map layer, e.g. from opentopomap.org, the tiles are 
> scaled down which results in a blur map image. In addition, QMS zoom 
> levels do not correspond to the tile zoom levels. When zooming in, every 
> second zoom level is just the rescaled tiles from the previous level. 
> The same maps are displayed in the correct scale in QLGT.
>
> Did I miss some configuration option?
>
> Environment:
> Debian Jessie/Testing
> KDE or XFCE
> QMS 1.0.1
>
> Regards
> Rainer
>
>
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