[OSM-newbies] sharing ways between areas

[Thomas Wood]

2008/12/24 Joe Richards <tenzin at penski.net>:
> So can I summarize on how to fix this so you can check my understanding...:
>  * I need to create some new nodes and ways which represent the area of the
> national park, in some areas following the coast but a few metres "inside"
> it's borders

No
The coastline way should be a linear feature
The national park way should be a complete loop
The two should overlap each other along the coastline, using the same nodes.

>  * the coastline will look better when I don't try to have
> leisure=national_park for some of the nodes/edges

The coastline will look better when it isn't wrapped all the way
around the edge of the national park.

>  * I need to split the national park into more areas because the current
> ones are too big for osmarender

Not sure yet about this, should be fine. It may even work if it was
all a single area - it's fairly small (compared to others that were
causing issues)

>
> Is that right?
>

I've also realised that leisure=natural_reserve is a typo of
leisure=nature_reserve
It may also be worthwhile using boundary=national_park

>
>
> On 24 Dec 2008, at 12:42, "Thomas Wood" <grand.edgemaster at gmail.com> wrote:
>
>> 2008/12/23 Joe Richards <joefish75 at yahoo.com>:
>>>
>>> I am trying to put a large national park into the map here:
>>> Permalink to NZ map of Abel Tasman national park
>>>
>>> with the intention of making the area green and labelled as a national
>>> park.  It's a very big area so I've split it into about three areas.
>>>
>>> The problem is that the edges of the national park go (in some places)
>>> right up to the coastline, and so I've shared the coast as an edge.
>>>
>>> There are several problems now:
>>> 1. the coastline appears to have 'bled' back into the main land area,
>>> creating big pools of water in the middle of the land
>>> 2. the national park doesn't appear green, which was the main intention
>>> in the first place.  It's genuinely sectioned-off, ie no building in this
>>> national park, and only walking tracks etc.  I think the areas around this
>>> part of the map would look better with the national parks marked off (and
>>> ideally the rivers too).
>>>
>>> What should I be doing to fix these problems?
>>>
>>
>> 1 Coastline is always awkward to edit, you can usually break things in
>> unexpected ways from slight changes - the renderers are quite picky
>> about data correctness here.
>> 2 Osmarender has some size issues when it comes to large areas.
>>
>> Your permalink didn't come through the email properly, but from a
>> quick glance at the data, you've made the coastline around this region
>> into closed areas.
>> The correct method would be to overlap the national park boundary with
>> the coastline by reusing the nodes, rather than giving the coastline
>> tag to the whole area.
>>
>> For others interested:
>>
>> http://www.openstreetmap.org/?lat=-40.8892&lon=172.9639&zoom=12&layers=B000FTF
>> The error with the coastline is clearly visible in osmarender.
>>
>> --
>> Regards,
>> Thomas Wood
>> (Edgemaster)
>



-- 
Regards,
Thomas Wood
(Edgemaster)