[OSM-dev] dropping segments

[Shaun McDonald]

On 27 Jul 2007, at 19:49, Nigel Magnay wrote:

> [..]
> Some questions:
> 1) Areas could just be a specific type, and/or they could have a  
> constraint such that first-node(area)==last-node(area). This seems  
> reasonable to me...
>

There is a problem with very large areas/ways. These cause major  
issues with the API/clients (editors). There was recently a large  
number of ways that were split due to them being to large. I can't  
remember the threshold for the number of segments per way that should  
be the maximum. There are some lakes that are multiple ways for example.

> 2) Areas with 'holes' could be stored as an area with 2 child  
> areas, and appropriate tags on those areas to control which was the  
> bit being added and which was the bit being subtracted (the hole) -  
> (I hope that makes sense)

Why can't layers be used for holes in an area?

Shaun

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