[Tagging] [OSM-talk] OpenStreetMap Carto release v4.25.0

Joseph Eisenberg joseph.eisenberg at gmail.com
Sun Feb 9 02:28:29 UTC 2020


I don't understand why mappers in Zeeland are considered less reliable
than those in South Holland? Isn't all of the Netherlands below sea
level, consisting entirely of polders and dykes? ;-) (Just joking... I
know there are hills some tens of meters above sea level...)

http://overpass-turbo.eu/s/QyU - hedge ways in South Holland (1011)
http://overpass-turbo.eu/s/QyT - hedge closed ways in South Holland
(137) - <14% of ways
http://overpass-turbo.eu/s/QyS - hedge closed ways with area=yes in
South Holland (91)

So in this case there is a 2:1 ratio of those with area=yes vs
without, unlike in Zeeland - but the total numbers for ways and closed
ways are both slightly lower than those for Zeeland (where there are
1179 ways, 146 closed).

I checked The Haag and Rotterdam, since it has been suggested that we
should look at mapping in towns and cities.

There are 3 places with area=yes hedges in Rotterdam. One is here,
where several plantings of bushes(?) spell out "ROTTERDAM" next to a
highway: https://www.openstreetmap.org/way/325978680#map=19/51.91438/4.53259
- note that the multipolygon hedges like
https://www.openstreetmap.org/relation/4550190 do not have area=yes. I
think it is a stretch to use "barrier=hedge" for a purely ornamental,
low-height planting like this.

The other place with more than one hedge is in this cemetery.
https://www.openstreetmap.org/way/550331809#map=19/51.87471/4.50668

In The Haag the main place was these hedge areas by the Vredespaleis
("Peace Palace"?): eg http://www.openstreetmap.org/way/665101476

But they are tagged area=yes + barrier=hedge, even though they look like this:

https://www.alamy.com/stock-photo-beautiful-garden-of-the-peace-palace-or-vredespaleis-in-dutch-which-104165268.html

Those are short linear hedges, about 1/2 meter wide, around a garden
flower bed. It is not a solid area of hedge, so area=yes is
misleading.

There are also some thin, 1 to 2 meter wide linear hedges along some
roads to the north of this palace, eg:
http://www.openstreetmap.org/way/291963185

The current rendering looks the same as before for these at z16 to
z18, since they are too narrow to see any gap between the lines:
https://www.openstreetmap.org/way/291963185#map=18/52.10004/4.29410.

At z19 a small gap between the lines is just visible:
https://www.openstreetmap.org/#map=19/52.10017/4.29383 - So there is
little advantage from mapping this feature as an area for rendering
maps at most zoom levels, though it might make a visible difference at
z20 and higher. Using the `width=` tag would be a reasonable
alternative.

Overall, even in South Holland it is rare to map hedges as an area
instead of as a linear feature, and there are a number of hedges
mapped as areas which lack area=yes, and some hedges with `area=yes`
that are not actually area features.



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