[OSM-talk-be] some thoughts and remarks about border mapping

[ivom]

Example from France
http://osm.schunterscouts.de/relation-browser.php?type=relation&id=7389


On Wed, 8 Oct 2008, ivom wrote:

> Hi,
>
> Just stumbled across a small webapp which allows to see interesting things 
> about relations.
>
> An example for a relation (type=border) in Berlin which is a collection of 
> ways with administrative boundaries of level 8. 
> http://osm.schunterscouts.de/relation-browser.php?type=relation&id=16347
>
> As far as I understand it, this is yet another way to tackle the problem. 
> Please note that the Karlsruhe example uses a relation of type=boundary.
>
> On Wed, 24 Sep 2008, Lennard wrote:
>
>> ivom wrote:
>> 
>>> I would like to second Ben's idea of starting to map borders with
>>> relations. A nice example which demonstrates borders mapped by relations I
>>> found near Karlsruhe:
>>> 
>>> http://www.openstreetmap.org/index.html?mlat=49.014750749784966&mlon=8.308414136442622&zoom=13
>>> 
>>> Check what hangs on the river Rhine in terms of relations. I think this is
>>> an interesting example what thing could start to look like with respect to
>>> borders.
>> 
>> To make it easy for all here:
>> 
>> The middle of the Rhine is a way, tagged:
>> 
>> name = KA Stadt BW
>> created_by = Potlatch 0.10b
>> boundary = administrative
>> admin_level = 4
>> source = pi x D. korr. nach: GADM
>> 
>> It is part of the following relations:
>> 
>> Relation 22027
>> name = Karlsruhe Regierungsbezirk
>> boundary = administrative
>> created_by = Potlatch 0.10b
>> type = boundary
>> 
>> Relation 22046
>> name = Baden-Würtemberg Bundesland
>> boundary = administrative
>> type = boundary
>> 
>> Relation 22049
>> name = Karlsruhe Stadt
>> created_by = Potlatch 0.10b
>> boundary = administrative
>> type = boundary
>> 
>> Relation 23140
>> name = Rheinland-Pfalz Bundesland
>> boundary = administrative
>> type = boundary
>> border_type = state
>> 
>> So the way is tagged with the highest admin_level, and it renders as the
>> highest level border that way. This is also what Ben suggested. And
>> thanks to the relations, you can still extract the correct and full
>> border for any admin_level, if you want to generate custom topographical
>> maps.
>> 
>> I would suggest keeping a list on the wiki of relations used for
>> boundaries in Belgium. This should ideally* keep people from generating
>> multiple relations for the same border.
>> 
>> 
>> 
>> * Right, Ivo? Since you made a new relation for LF30, while mine was
>> already on the map for a few weeks and in the wiki. I'll be connecting
>> yours and mine shortly, thanks to a trip to Puyenbroeck yesterday. :)
>> 
>> --
>> Lennard
>> 
>> 
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>