[OSM-talk] Rendering issues with Carto 4.0

[Dave F]

Hi

Is there anybody with more skill than I able to put a overpass routine 
for this?
I prefer to check problems close to me than the randomness of roulette.

Ta
DaveF

On 20/06/2017 10:24, Jochen Topf wrote:
> Hi!
>
> In the last days the OpenStreetMap Carto Style 4.0 is being deployed on
> the OSMF tile servers. This new version of the style doesn't take old-style
> multipolygons (where the tags are on the outer ways instead of on the
> relation) into account any more. In a huge effort in the last months we
> have removed old-style multipolygons from the OSM database completely,
> so this is a good step!
>
> Unfortunately nobody really realized that as a side-effect of the update
> to Carto 4.0 many multipolygon relations would appear wrong on the map.
> This is the case for multipolygon relations that have the same tags on
> the relation as well as on (some of the) outer or inner ways. This is
> *wrong* tagging, and needs to be fixed. Note that this always was wrong
> tagging, even before we deprecated old-style multipolygons, but the way
> the software worked with old-style multipolygons, this problem was not
> visible on the map.
>
> Here is an example: http://www.openstreetmap.org/relation/1330741 . As
> you can see (unless somebody fixes this :-) the clearing in the forest
> that should just have grass, also has tree symbols on it. In many other
> cases it is not this obvious, there are just islands in a river missing
> or so.
>
> There are about 50,000 cases like this, forests, waterways, all sorts of
> areas. Worst offenders are about 15,000 relations from imports in Canada
> and 8,000 relations from imports in New Zealand.
>
> Please help fixing these. As part of the "area fixing effort" I have
> started to create Maproulette challenges for these. Go to
> http://area.jochentopf.com/fixing.html for more information and read
> the detailed news about this effort at
> https://github.com/osmlab/fixing-polygons-in-osm/issues/15 .
>
> Jochen