[talk-au] Errors in rendering names of administrative boundaries

[ajt1047 at gmail.com]

On 25/07/2016 08:14, cleary wrote:
> I have noticed errors in rendering names of administrative boundaries on
> the OSM website map.  It is not just Australian boundaries. For example
> http://www.openstreetmap.org/#map=19/48.99957/-110.00728    shows Canada
> and United States on the reverse sides of their shared boundary.
>

I suspect that what's happening is that it's not displaying the text on 
a particular side of the boundary, but instead just to one side or the 
other?  The setting is I guess the "text-dy" below here:

https://github.com/gravitystorm/openstreetmap-carto/blob/0c70682a69c91b833399c1dd74409eee79ce4af1/admin.mss#L168

If you go up a bit from your "wrong side" example to 
http://www.openstreetmap.org/query?lat=49.00370&lon=-110.00508#map=19/49.00368/-110.00487 
you can see a place where three relation memberships are all displayed 
on the same side of the line.

It might be fixable in the style (have a look through the issues at 
https://github.com/gravitystorm/openstreetmap-carto/issues ) or it might 
need something in mapnik itself (https://github.com/mapnik/mapnik/issues ).

Whilst looking at something completely different (how to use the road 
casing to indicate there's a sidewalk) I did come across a hack to 
display the road asymetrically over the casing - see 
http://www.openstreetmap.org/user/SomeoneElse/diary/38136#comment34110 
and 
http://gis.stackexchange.com/questions/128244/tilemill-inset-line-with-negative-line-offset-property-value-produces-strange-a 
- so something like that might be doable here.  Above my Mapnik pay 
grade though :)

Cheers,

Andy