On 2014-11-24 05:00, Martin Koppenhoefer wrote:
I wonder why US States are tagged as admin_level=4, wouldn't it be more consistent with the rest of the map to have them tagged as level 3?
IIRC mappers in many regions of the world started out using even-numbered admin_levels only, skipping the odd numbers, so that more obscure groupings of jurisdictions could be inserted in the future without going fractional. And indeed, if you look at [1], admin_level=3 has been used primarily for "regions": groups of provinces that have no separate administrative authority. Assuming this table reflects the actual state of the map, most countries have chosen 4 for their state equivalents.
This level-skipping scheme extends all the way down to the smallest jurisdictions. Because the TIGERcnl import chose admin_level=8 for municipalities, skipping 7, I was able to tag Ohio townships as 7 without demoting all the state's cities and villages. [2] Even though neighboring Kentucky and West Virginia lack a level of government between counties and municipalities, it makes sense to keep cities in most states at the same admin_level, because they're functionally equivalent. (Virginia is a notable exception.)
For context, there's an open pull request to have the Standard stylesheet render country and state labels based on administrative boundary polygons rather than place nodes. [3]
Martin, how would the U.S. would be affected by this change? As it stands, U.S. state boundaries and labels appear at z4 and above, regardless of the state's size. Of the smallest states, Rhode Island (RI) appears at z4 and z6+, Connecticut (CT) appears at z4+, and Maryland (MD) and Delaware (DE) are both obscured at z4 by the label for Washington, D.C.
At a glance, this change would seemingly omit most of the Northeastern states' labels at z4. It appears to set a minimum size of 750 "way pixels" at z4 and 3,000 at z5 for displaying a state's label. I don't really see those states' two-letter refs as being clutter. They're probably the most informative use of that space at z4 in a big country like the U.S. Unfortunately, they really clutter up the map in smaller countries, especially in Europe.
[1] http://wiki.osm.org/wiki/Tag:boundary%3Dadministrative [2] http://wiki.osm.org/wiki/United_States_admin_level [3] https://github.com/gravitystorm/openstreetmap-carto/pull/1134 -- m...@nguyen.cincinnati.oh.us _______________________________________________ Talk-us mailing list Talk-us@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-us
