[OSM-newbies] mapping islands of a salt flat

[Alexandros Papadopoulos]

I still do not understand how to do it properly, but the islands have
appeared on the map so perhaps someone else went ahead and fixed it. I
would also like to see a HOWTO or documentation on multi polygon
relationships, the rationale behind them etc so please keep me posted.

On 21 December 2011 21:36, Jim <jfulme1 at gmail.com> wrote:
> Was there a resolution for this?  I found that it works for me on some
> polygons, not on others.
>
> -----Original Message----- From: Alexandros Papadopoulos
> Sent: Friday, December 02, 2011 7:33 PM
> To: newbies at openstreetmap.org
> Subject: Re: [OSM-newbies] mapping islands of a salt flat
>
>
> On 24 November 2011 16:24, Alexandros Papadopoulos
> <alexandros.papadopoulos at gmail.com> wrote:
>>
>> On 24 November 2011 15:21, Richard Weait <richard at weait.com> wrote:
>>>
>>> On Thu, Nov 24, 2011 at 1:03 PM, Alexandros Papadopoulos
>>> <alexandros.papadopoulos at gmail.com> wrote:
>>>>
>>>> On 24 November 2011 13:38, Craig Wallace <craigw84 at fastmail.fm> wrote:
>>>>>
>>>>> On 24/11/2011 15:33, Alexandros Papadopoulos wrote:
>>>>>>
>>>>>>
>>>>>> Hello.
>>>>>>
>>>>>> I am mapping the islands of the Salar de Uyuni
>>>>>> (http://osm.org/go/NK_7Jv--) as I found it particularly annoying they
>>>>>> were not on the map when I needed this information.
>>>
>>>
>>> [ ... ]
>>>
>>>>> Islands in inland water need to mapped with multipolygon relations. ie
>>>>> map
>>>>> the island as an area, and add it to a multipolygon relation with role
>>>>> "inner", and add the outline of the lake to the relation with role
>>>>> "outer".
>>>>> I see that Isla Incahuasi is already mapped with a multipolygon
>>>>> relation, so
>>>>> you can add all of the other islands to the same relation, with role
>>>>> inner
>>>>> for each.
>>>>>
>>>>> There is no need to tag the islands with natural=land. It is more
>>>>> useful to
>>>>> tag what is actually there. eg if the island is covered with trees then
>>>>> tag
>>>>> it with natural=wood, or if its a beach tag it as natural=beach etc.
>>>>
>>>>
>>>> Thanks Craig.
>>>>
>>>> So to sum up:
>>>>
>>>> 1. Mark the island as an area.
>>>> 2. Add any useful designations (natural=beach etc)
>>>> 3. Add to multipolygon relation.
>>>>
>>>> I have attempted to do just that for the 20odd islands I can see on
>>>> Bing aerial photography, hope I did the right thing.
>>>
>>>
>>> Almost perfect, Alex.
>>>
>>> As Craig said, once these new polygon islands are added to the
>>> multipolygon relation for the salt flat, you must assign the island a
>>> "role" in the multipolygon relation.
>>>
>>> in potlatch, select the island way
>>> in the advanced tab, double click the relation number to open the
>>> relation dialogue box.
>>> select the members panel in the relations dialogue
>>> add "inner" for the role of the island ways.
>>> then save your changes as usual.
>>
>>
>> Ah, afraid you lost me with "add "inner" for the role of the island ways."
>>
>> From the long list of way IDs I get, how do I know which way is the
>> island I am editing;
>>
>> I see what is in the screenshot "for free", ie this is what comes up
>> without me doing anything more than assigning the island way to the
>> multipolygon relationship.
>>
>> Sorry for omission of special characters in email, Chilean computer I
>> use has funny keyboard layout.
>>
>> A step by step example for one island might hopefully help.
>>
>> Thanks
>>
>> Alex
>
>
> This is still pending and the islands of the Salar de Uyuni remain
> unmapped. Has my previous email with the screenshot from P2 made it to
> the list? Would appreciate some more help to get this over and done
> with.
>
> Cheers
>
> Alex
>
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