[OSM-talk] OpenStreetMap Carto database schema change

[Dave F]

One improvement/correction?: The wooded area South of Greyfield Wood:
https://lua.osm-carto.paulnorman.ca/#15/51.3189/-2.5230

Last edited 2 years ago. OSMI doesn't flag it up as a problem & it 
appears to have just one shared start.end point.

Cycle/Transport/Human all render it.

DaveF .



On 31/01/2017 12:29, Christoph Hormann wrote:
> On Tuesday 31 January 2017, Dave F wrote:
>> What benefits does this bring to the end user zooming & panning
>> around? You've produced a demo so I presume there is one.
> I think there is currently no comprehensive list of practical direct
> effects this has.
>
> The most significant ones are likely various differences in the way
> polygons are interpreted and rendered.
>
> Of these differences the most prominent one is probably due to loading
> each multipolygon relation as a single feature into the rendering
> database (osm2pgsql -G option) rather than splitting it into separate
> components.  This makes a strong difference w.r.t. rendering of labels
> for administrative boundaries.  However this is not mainly what we are
> asking for feedback here since this is a change which is already well
> known and well tested in its effects.  We are also aware that this
> change will likely require tuning the style in terms of label placement
> in the long term - which is however not a point of concern right now.
>
> Where feedback is most useful are the more suptle changes which will
> only have a visible effect in a smaller number of situations.  See the
> PR Paul linked to for details.  In particular it would be important to
> know if there are situations where the new database schema leads to
> incorrect mapper feedback through the the way things are rendered.
>


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