[talk-au] PSMA Administrative Boundaries

[Andrew Davidson]

On 07/10/18 18:32, Andrew Harvey wrote:
> 
> I see the next steps are to:
> 
> - discuss if this is the right format for upload or not,

One question would be should we be putting a place tag on admin 
boundaries? According to taginfo only 34% of admin_level=10 has a place 
tag.

> - how we'll manage that upload in terms of breaking it up into smaller pieces

I'd assumed that you'd be uploading them using an import account. How 
small to break them up into would depend on what's used to upload them. 
State-by-state does have the advantage that the existing state borders 
are going to have to be manual snapped to the imported boundaries anyway.

> - if there is any re-using of existing ways or not

As several others have pointed out if we import the boundaries 
completely then mappers can manually snap them to natural features, 
roads, other boundaries etc to their heart's content. This step is 
optional as the boundaries will still be valid even if no one does any 
follow up work.

As a minimum the boundaries would have to be matched to the existing 
state boundaries, otherwise there will be overlaps or slivers.

> - how to ensure we're retaining the existing LGA/Suburb data in OSM.

So I'm assuming here that we are not talking about NSW/SA/ACT. These 
have already been done from state data and if the PSMA data is different 
then we should be going back to the state data to check (at which point 
we're using the state data).

To keep history I thought we'd could keep record of the current relation 
numbers of the existing admin boundaries, scrub off the no longer needed 
ways, and once the new boundaries are imported swap the new for old. For 
boundaries that are currently closed ways we'd need to convert them to a 
one-member relation first.