[mapserver-users] Mapcache - Howto provide additional high DPI tileset?

[Robert Sanson]

So we would need to prepare two complete tile sets.

Is there then a way in the Javascript code to switch the WMTS call from the 256x256 grid to the 512x512 grid if the client browser has a Retina display?

Thanks,
Robert

From: mapserver-users [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of thomas bonfort
Sent: Wednesday, 25 January 2017 4:49 a.m.
To: Michael Schulz <mandschulz at googlemail.com>; mapserver-users at lists.osgeo.org
Subject: Re: [mapserver-users] Mapcache - Howto provide additional high DPI tileset?

Should be doable, just define a new grid for it:

<grid name="g">
 <extent>-20037508.3427892480,-20037508.3427892480,20037508.3427892480,20037508.3427892480</extent>
<srs>EPSG:3857</srs>
<size>512 512</size>
<!-- level 0 of the original google grid is removed 156543.0339280410 -->
<resolutions>
78271.51696402048
39135.75848201023
19567.87924100512
9783.939620502561
4891.969810251280
2445.984905125640
1222.992452562820
611.4962262814100
305.7481131407048
152.8740565703525
76.43702828517624
38.21851414258813
19.10925707129406
9.554628535647032
4.777314267823516
2.388657133911758
1.194328566955879
0.5971642834779395
0.29858214173896975
</resolutions>
<!--.29858214173896975 is added-->
</grid>

--
thomas

On Tue, Jan 24, 2017 at 4:09 PM Michael Schulz <mandschulz at googlemail.com<mailto:mandschulz at googlemail.com>> wrote:
Dear MapCachers,
I would like to know if anybody had success in using mapcache to provide tiles for usage on retina displays? There seems not to be the one default strategy to do so, but IIUC the baseline is to provide a bigger tile (512x512 instead of 256x256) for the some extent.
Now the question is, how to generate with mapcache an additional cache with big tiles (512) but can be accessed using identical tile requests? By identical, I mean that the xyz numbers stay the same, but a different tileset name is used (e.g. basemaps.at<http://basemaps.at> does that) or using MapBox's "@2x" modifier.
Any ideas or solutions?
Thanks, Michael


--
-----------------------------------------------------------
Michael Schulz

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