[openstreetmap/openstreetmap-website] Dashboard map under/overzooms map tiles at fractional zoom levels (Issue #6618)

[Christoph Hormann]

imagico left a comment (openstreetmap/openstreetmap-website#6618)

There seems to be a lot of fairly fundamental misunderstanding here of map design and map rendering, in particular a constant conflation of map scale and map rendering resolution.  I neither have the time nor energy to clear this up here fully.  But just to be clear: I said OSM-Carto is designed for a specific set of discrete scales, not for specific resolutions.  On the contrary: We have invested substantial efforts over the years to make sure the style can be rendered at higher resolutions.  The style can be rendered also at different scales than the ones it is designed for with decent results, i explained that already.  What you, however, should not do is render it for one scale and display it at a substantially different scale or render it at one resolution and then display it at a different resolution - or, as it is done on the dashboard map right now: Display it at a different scale *and* a different resolution compared to what it is designed and rendered for.

> If you can point me towards what features you are missing

No, i am not missing any concrete features since i am not looking at concrete products, i am observing the way matters of raster data processing are discussed and handled in the community in general across different projects.  I would be of no help in choosing an approach from within the box of methods and tools you are familiar with, my ability is the strategic look, identifying where methodological innovation is needed and developing such methods.

> I can't work with a flat "don't do it".

Frankly, my impression is that it is completely unclear what problem you are trying to solve on either the engineering or the design level by re-sampling OSM-Carto tiles.  But that is of course besides the point here.  I have given the recommendations from the perspective of OpenStreetMap Carto design.  I am open to arguments for changing/amending those recommendations, but so far i have seen nothing convincing.  The inability to follow the recommendations is not a valid argument.  I can't help with how to do that with the framework of your choosing, but - as said - thousands of websites demonstrate every day that it is definitely possible to do this in general.


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