[OSM-dev] OSM for Retina and high-pixel density devices

[André Riedel]

The german start-up LyrkGeodienste renders HD-Tiles (512x512).
https://geodienste.lyrk.de/pakete

2015-01-29 0:20 GMT+01:00 Christoph Hormann <chris_hormann at gmx.de>:
> On Wednesday 28 January 2015, Michael Meier wrote:
>> [...]
>>
>> However, in addition to the problem of limited resources, I don't
>> think the style is ready yet. Though there has been a lot of progress
>> lately, the openstreetmap-carto-style has many symbols, and many
>> still aren't SVG and thus are not "HD ready" - they look really ugly
>> in HD tiles.
>
> Non-scalable elements in the style are only part of the problem.  In
> general nearly all maps rely on the rasterization to perform necessary
> spatial frequency filtering or in other words: they cannot change
> output resolution independent from the level of detail.
>
> If you for example compare
>
> https://c.osm.rrze.fau.de/osmhd/6/35/18.png
> https://c.osm.rrze.fau.de/tiles/7/71/36.png
>
> or
>
> https://c.osm.rrze.fau.de/osmhd/8/133/85.png
> https://a.osm.rrze.fau.de/tiles/9/267/171.png
>
> or
>
> https://a.osm.rrze.fau.de/osmhd/8/132/75.png
> https://c.osm.rrze.fau.de/tiles/9/265/151.png
>
> You can see that apart from the styling differences between the zoom
> levels and the differences in label sizes these look identical.  But
> for good readability on high resolution devices you do not want the
> additional details which are too small to be properly read leading to
> mushy results, you want better acuity with the same amount of detail.
>
> --
> Christoph Hormann
> http://www.imagico.de/
>
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