* Kevin Kenny <[email protected]> [2019-03-08 14:25 -0500]: > On Fri, Mar 8, 2019 at 11:37 AM Martijn van Exel <[email protected]> wrote: > > > > I agree that a local US OSM map with a *subtly* adapted rendering would be > > fantastic. Phil Gold did some interesting work years ago on rendering US > > style highway shields taking into account (sometimes crazy) route > > concurrency > > (http://elrond.aperiodic.net/shields/?zoom=13&lat=39.75926&lon=-86.02786&layers=B > > - note that this is based on years-old data and probably pre-carto-switch > > stylesheet). Lars Ahlzen created the beautiful TopOSM which is a lot more > > divergent from the main map style, but another great example of initiatives > > around custom map rendering coming out of the US community. > > I've borrowed ideas (and some limited amount of code) from both of > them in doing my experimental rendering [snip] > The chief roadblocks to scaleability are that the graphics are > generated in what amounts to a batch process, taking several minutes, [snip] > Then there's the issue that the graphics for individual shields are > being stored in PNG, which is rendered in a batch process that takes > typically several minutes (so could not cope with minutely updates).
I started work last year on a better system that generates SVGs on the fly from OSM data, so it doesn't need the pregeneration step. I got bogged down with other things before I quite finished, but it's mostly there. (There are just a few Canadian routes left to convert; I was having difficulty finding official specs for their signs.) I don't think this is really documented yet, but I now support four different sign styles, passed as the `style` parameter to the Python rendering functions: * "generic" uses a standard, generic style for every US state and county, disregarding their individual styles. * "guide" matches the styles used on highway guide signs. This is now the default, since it seems most fitting to map rendering. * "sign" looks like the roadside reassurance markers. * "cutout" is a modification of the "sign" style to remove dark background areas. This used to be the default with my old system. Anyway, the code is here: https://gitlab.com/asciiphil/osm-shields Hopefully at some point I'll find time to finish up my changes. (And, ideally, merge in all of the extra shields you and Minh have put together.) -- ...computer contrarian of the first order... / http://aperiodic.net/phil/ PGP: 026A27F2 print: D200 5BDB FC4B B24A 9248 9F7A 4322 2D22 026A 27F2 --- -- What computers do Daleks use? X-TERMINALS, X-TERMINALS! ---- --- -- _______________________________________________ Talk-us mailing list [email protected] https://lists.openstreetmap.org/listinfo/talk-us
