[mkgmap-dev] Problem with names of relations

Wed Sep 26 18:47:04 BST 2012

On 26/09/2012 15:42, Marko Mäkelä wrote:
> On Wed, Sep 26, 2012 at 12:04:59PM +0100, Roger Calvert wrote:
>> If a relation has the same name as one of its components (or perhaps
>> any name), the name of the component is lost.
>>
>> I identified this on way 4798060, a small lake called 'High Dam'.
>> Because there are islands in the lake, it is the outer component of
>> relation 1369084, which also had the name 'High Dam'. Following mkgmap
>> processing, the lake came out with its default name 'Reservoir'.
>> However, when I removed the name from the relation, it came out with
>> its correct name. (It appears correctly on OSM renderings such as
>> mapnik).
> I believe that the correct fix would have been to remove the name from
> the role=outer ways and keep the name in the relation. Similarly, remove
> any natural=water from the outer way(s) and add them to the relation.
> This would make the multipolygon unambiguous.
>
> 	Marko
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>
>
I'm sure this is correct, but it is not very intuitive to the mapper, 
particularly as the relation may be created by someone other than the 
original mapper. For example, mapper A puts in the lake, and some time 
later, mapper B puts in more detail, including the islands and the 
relation. I am sure there are many cases where this may happen or has 
happened - I found this one by chance as it is in my local area. It 
would be nice if all mappers were perfect, but .........

It would be helpful if some workround could be found in mkgmap. All the 
other renderings I have looked at seem able to handle it. If the 
relation name and the polygon name (or other tags) are different, I 
agree there is a problem. But if they are the same, I don't think the 
result should be that the polygon loses its name completely.

Roger
-- 
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Roger Calvert
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