[OpenLayers-Users] blurry tiles

[Toni Hernandez Valles]

Yes thet look exactly the same.

Although I am using de OL default resolutions, is it possible that my
OL map is not using the same zoom resolutions than mapbox?

Toni


On Tue, 2020-05-05 at 11:30 +0200, Andreas Hocevar wrote:
> Using `zDirection: -1` is not always a good idea. Especially not if
> the tiles are already upscaled on the server.
> 
> You can look at the two maps below. Both use the Mapbox Satellite
> tileset. The first rendered in mapbox-gl, the second inOpenLayers
> (without a zDirection set). For me, they look and behave exactly the
> same:
> 
> 
https://api.mapbox.com/styles/v1/mapbox/satellite-v9.html?title=true&access_token=pk.eyJ1IjoibWFwYm94IiwiYSI6ImNpejY4M29iazA2Z2gycXA4N2pmbDZmangifQ.-g_vE53SD2WrJ6tFX7QHmA#17.4/47.078636/15.426918
> 
> https://r55zn.csb.app/#/center/15.42692,47.07864/zoom/17.4
> 
> Andreas.
> 
> 
> On Tue, May 5, 2020 at 9:21 AM Toni Hernandez Valles <
> toni.hernandez at udg.edu> wrote:
> > Hello,
> > 
> > Me too. I added the zDirection:-1 to the layer source, and the
> > issue
> > still persists. :-(
> > 
> > 
> > 
> > 
> > On Mon, 2020-05-04 at 15:48 -0600, Richard Greenwood wrote:
> > > I'm seeing something similar with Mapbox satellite tiles. I
> > > added zDirection: -1 to my source definition but it didn't have
> > any
> > > effect.
> > > 
> > > resolution 0.6237836388319881
> > > 
> > > resolution 0.5518893502310329
> > > 
> > > 
> > > On Mon, May 4, 2020 at 2:14 PM Andreas Hocevar <
> > > andreas.hocevar at gmail.com> wrote:
> > > > By default, OpenLayers applies up- and downscaling to the
> > tiles. To
> > > > avoid upscaling, configure the source with
> > > > 
> > > >     zDirection: -1
> > > > 
> > > > Andreas.
> > > > 
> > > > On Mon, May 4, 2020 at 8:47 PM Toni Hernandez Valles <
> > > > toni.hernandez at udg.edu> wrote:
> > > > > Helo everyone,
> > > > > 
> > > > > I am using a vector tile from mapbox and I am getting bluring
> > > > > tiles
> > > > > with no apparent reason. Not for me, at least
> > > > > 
> > > > > I have checked tiles directly to mapbox and the quality is
> > > > > perfect,
> > > > > but, when using tiles with OpenLayers the map quality gets
> > lower.
> > > > > 
> > > > > In this link (https://mapscloud.udg.edu/blurry_tiles.png) you
> > can
> > > > > see
> > > > > the quality of the map image (on the left) and the quality of
> > a
> > > > > single
> > > > > tile. Check the costline and the name "Roses" to see the
> > > > > difference.
> > > > > 
> > > > > 
> > > > > I have tried both tile sizes (256 and 512) with the same
> > result.
> > > > > 
> > > > > This is the code for the layer for size 256.
> > > > > 
> > > > > var mapbox =  new TileLayer({
> > > > >     source: new SourceXYZ({
> > > > >       url: '
> > > > > 
> > 
https://api.mapbox.com/styles/v1/mapesbasesigte/ck9olcn8017xc1it6mhv6myje/tiles/256/{z}/{x}/{y}?access_token=mytoken'
> > > > > ,
> > > > >     })
> > > > >   })
> > > > > 
> > > > > And the code for the map.
> > > > > 
> > > > > map = new Map({
> > > > >   layers: [ mapbox ],
> > > > >   target: 'map',
> > > > >   view: new View({
> > > > >     center: [0, 0],
> > > > >     zoom: 2,
> > > > >     projection: 'EPSG:3857',
> > > > >   }),
> > > > >   controls: defaultControls({attribution:
> > > > > false}).extend([attribution]),
> > > > > });
> > > > > 
> > > > > Am I doing something wrong?
> > > > > 
> > > > > Thanks you!!!
> > > > > _______________________________________________
> > > > > Users mailing list
> > > > > Users at lists.osgeo.org
> > > > > https://lists.osgeo.org/mailman/listinfo/openlayers-users
> > > > 
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> > > 
> > >