Thank you for making this, it looks like a lot of work! These client-side vector tiles at z8? ( https://pnorman.dev.openstreetmap.org/cartographic/mapbox-gl.html)
My laptop (2015 Macbook Pro, 16 GB RAM, 2.2 GHz Intel Core i7) appears to use some effort to show areas with a large amount of data, For example if I view England + Wales on z8 and then move over to the Netherlands and then to Germany, at z7 and z8, CPU usage goes up to >100% for a time, and there is a noticeable delay. Perhaps part of this is a delay in serving the tiles? It would be nice to see a demonstration of this applied server-side to produce raster tiles. Are there any samples of that yet? – Joseph Eisenberg On Sun, May 24, 2020 at 5:37 PM Paul Norman via dev <dev@openstreetmap.org> wrote: > I've been working on a new project, OpenStreetMap Cartographic. This is > a client-side rendering based on OpenStreetMap Carto. This is an > ambitious project, as OpenStreetMap Carto is an extremely complex style > which shows a large number of features. The technical choices I'm making > are designed so the style is capable of handling the load of osm.org > with minutely updates. > > I've put up a world-wide demo at > https://pnorman.dev.openstreetmap.org/cartographic/mapbox-gl.html, > using data from 2020-03-16, and you can view the code at > https://github.com/pnorman/openstreetmap-cartographic. > > Incomplete parts > ================ > > Only zoom 0 to 8 has been implemented so far. I started at zoom 0 and am > working my way down. > > Admin boundaries are not implemented. OpenStreetMap Carto uses > Mapnik-specific tricks to deduplicate the rendering of these. I know how > I can do this, but it requires the changes I intend to make with the flex > backend. > > Landuse, vegetation, and other natural features are not rendered until > zoom 7. This is the scale of OpenStreetMap Carto zoom 8, and these > features first appear at zoom 5. There are numerous problems with > unprocessed OpenStreetMap data at these scales. OpenStreetMap Carto gets > a result that looks acceptable but is poor at conveying information by > tweaking Mapnik image rasterizing options. I'm looking for better options > here involving preprocessed data, but haven't found any. > > I'm still investigating how to best distribute sprites. > > Technology > ========== > > The technology choices are designed to be suitable for a replacement for > tile.osm.org. This means minutely updates, high traffic, high reliability, > and multiple servers. Tilekiln, the vector tile generator, supports all > of these. It's designed to better share the rendering results among > multiple servers, a significant flaw with renderd + mod_tile and the > standard filesystem storage. It uses PostGIS' ST_AsMVT, which is very > fast with PostGIS 3.0. On my home system it generates z0-z8 in under > 40 minutes. > > Often forgotten is the development requirements. The style needs to > support multiple developers working on similar areas, git merge conflicts > while maintaining an easy development workflow. I'm still figuring this > out. Mapbox GL styles are written in JSON and most of the tools > overwrite any formatting. This means there's no way to add comments to > lines of codes. Comments are a requirement for a style like this, so > I'm investigating minimal pre-processing options. The downside to this > will make it harder to use with existing GUI editors like Fresco or > Maputnik. > > Cartography > =========== > > The goal of this project isn't to do big cartography changes yet, but > client-side rendering opens up new tools. The biggest immediate change > is zoom is continuous, no longer an integer or fixed value. This means > parameters like sizes can smoothly change as you zoom in and out, > specified by their start and end size instead of having to specify each > zoom. > > Want to help? > ============= > > Have a look at https://github.com/pnorman/openstreetmap-cartographic and > have a go at setting it up and generating your own map. If you have > issues, open an issue or pull request. Or, because OpenStreetMap > Cartographic uses Tilekiln have a look at > https://github.com/pnorman/tilekiln/issues. > > > _______________________________________________ > dev mailing list > dev@openstreetmap.org > https://lists.openstreetmap.org/listinfo/dev >
_______________________________________________ dev mailing list dev@openstreetmap.org https://lists.openstreetmap.org/listinfo/dev
