On 2015-01-14 01:29, Paul Norman wrote:
On 1/13/2015 5:34 AM, Minh Nguyen wrote:
It looks like most of the place=city/town/village/hamlet POIs from
GNIS are tagged with 2000 Census populations in the population tag.
These population tags allow renderers to label places with font sizes
corresponding to population, which is a pretty common use case.
I had done a PR which would have added population sorting for place
names, but as a style maintainer I'm interested in what styles use
population for sizes.
Here are a couple that use it:
https://github.com/Citytracking/Terrain
as seen at: http://maps.stamen.com/terrain/
https://github.com/migurski/OSM-Solar
I do see quite a few instances of population-based sorting on GitHub:
https://github.com/search?q=planet_osm_point+population&type=Code
But the difference between 2006 and 2010 populations is unlikely to be
large enough to matter much for this use case.
Still, weighting city labels by population is a common enough practice
dating back to the days of paper maps. Someone trying to emulate it with
OSM data would find the `population` tag much more convenient than
conflating with an external source, since precision would be less
important than accuracy.
I think we should consider a mechanical edit to update these tags to
the 2010 Census figures en masse. I've been updating individual places
as I edit them for other reasons, but this tag is most useful when its
vintage is consistent across the board.
Although I somewhat like the idea of updating the population tags, I
think we should give higher priority to fixing their tagging. When I did
some cleanup of Washington place=city POIs I found that I ended up
retagging most, deleting many, and only a few were place=city.
In Ohio and surrounding states, I've seen lots of incorrect `place=city`
on boundary relations, but all the `place=city` POIs were correct. I
think the `place` tags on those relations were set to whatever the TIGER
classification happened to be. On the other hand, there are plenty of
`place=hamlet`s on POIs that should either be deleted or turned into
named landuse areas (mostly trailer parks).
--
[email protected]
_______________________________________________
Talk-us mailing list
[email protected]
https://lists.openstreetmap.org/listinfo/talk-us
