On Fri, 31 May 2019 at 12:14, Andy Townsend <ajt1...@gmail.com> wrote:
> On 31/05/2019 11:26, Paul Allen wrote: > > > > Example of the horrors of using canal for a leat with current carto: > https://www.openstreetmap.org/way/609805692#map=16/52.0804/-4.6799 > At z=19 it's actually close to the true width of the leat. > > A bigger problem is the lack of granularity of rendering width at various > zoom levels (see for example > https://www.openstreetmap.org/#map=13/54.1856/-0.8334 , > https://www.openstreetmap.org/#map=14/54.1850/-0.8258 and compare with > https://map.atownsend.org.uk/maps/map/map.html#zoom=14&lat=54.18504&lon=-0.80956 > ). > That's the point, actually. Sub-types of canals are treated with far more importance than they deserve. Things like mill races/leats ought to disappear at lower zooms in the same way that ditches do. Not a perfect solution, and specialist carto styles may want to handle them differently, but your mapping of mill race and leat to ditch is a very good compromise. Ditches disappear at other than the highest zooms, streams disappear at even lower zooms. At the moment mill races are being treated like canals, which is as bad as if we treated ditches and streams like we do rivers. I'm aware of the discussions over on github. They're mainly focused on how to handle things if canal width is specified (as the wiki suggests), and that it's very hard and complex to make that work. The merit of your solution is that the difficult code to handle ditches is already there and the additional code to render a leat the same way as a ditch is trivial. It's clear (to me) that your solution would be acceptable to at least those people who have tagged for the renderer by tagging leats as ditches rather than canals. Even if others say it's not perfect, it's a LOT better than we have now by rendering leats the same way as navigation canals. It strikes me that it's a good interim solution pending something better, and if something better never happens I can live with that. -- Paul
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