1

Hello,
in some countries admin_level=4 are on the coastline. This in my opinion would be the the right way to mark a subnational border.
In Somalia and Yemen (countries where I’m working on) admin_level=4 are on maritime borders, as the national borders.

As I’m checking the relations and add the int_name, could I change this without harming nobody’s vision?

2

Hi. The right way is to mark the subnational border where the laws of each territory specifies them.

Before changing them, I would contact both local communities asking about the issue.

3

Thanks.
In the wiki page https://wiki.openstreetmap.org/wiki/WikiProject_Yemen
there’s no indication about a community, so I sent messages to a couple Yemenite user I found.

Alessandro

4

Unfortunately some countries are having both: AL4 including the maritime area and AL4 following the coastline.

e.g. Ecuador

yellow: AL2
orange: AL4

Same in Chile and some other countries.

I think, most mappers adding AL4 to osm don’t know what is false or correct - had the same problem some years ago.

Regards
Walter/Germany

btw: Need to check what is wrong with El Piedrero(8). That should not be listed on this position of the tree.

5

Not Somalia and Yemen, but most countries, like Oman, UAE, Iran, Egypt, Turkey, Libia, Finland, Sweden, Norway, Russia, India, Thailand, Malysia, Indonesia, China, korea, Japan …

6

Why? in the wiki https://wiki.openstreetmap.org/wiki/Tag:boundary%3Dmaritime maritime border may be in Internal borders.

7

That section in wiki pages is related to
CIT: “In the United States of America, NOAA nautical charts specify in Note X:”

So, there’s not a worldwide rule, but we should follow the single countries rules. I’m italian and I know here the maritime borders are applied just to the national borders.

I will try to investigate in the UN geoportal, but as the subnational borders are usually not a political matters, I don’t know if I can find an answer there.
[EDIT: checking against the UN geoportal, all the administrative borders are cut to the coastline. So I can’t get any information whether a country apply maritime boundaries to the admin_level 4/6 or not]

So, I think the definitive answer is asking to the local communities