On 26/05/2020 13:26, Christoph Hormann wrote:
As Joseph has hinted when it comes to accurate rendering for precise
mapper feedback without unintentional incentives at the lower zoom
levels there are other options based on pre-rasterizing the data which
would still allow using the benefits of client side styling.  I have
demonstrated that in the past.

Rasterization is a data generalization technique too. Yes, in some cases it leaves no artifacts at all but that's not true in a general case and almost never true on mobile platforms. It is a viable solution but to make it work well the style should not use borders or bake in antialiasing (i.e. leave that to the client code).

I am concerned about something else - even with polygon generalization in place, the performance is not great. Zooming/panning is rather slow on my not so weak PC - the map would be unusable on a mobile device or at best it would be draining the battery quickly.

I've been looking into the code and I couldn't find anything related to polygon generalization. Where is it done? If it happens automatically in the Mapbox GL renderer that's too late - all the cost of preparing tiles, transmitting them, processing them in the client has already been incurred. Displaying data via WebGL is probably the cheapest part of the processing chain.


dev mailing list

Reply via email to