[Talk-GB] Admin Boundaries and OS OpenData BoundaryLine

[Colin Smale]

Having just taken a look at ogr2osm I think that is probably the best 
way of achieving OSM-data with a view to a bulk import. However there 
are lots of disadvantages and gotcha's on that route as several people 
have pointed out. If we were to take that route there would not be any 
point in going further with the GPX files.

I have prepared a set of GPX files (one per admin area) from the main OS 
shapefiles. What would be the best way to get these into OSM? I guess it 
will be a manual process to split the boundary, create a relation, 
transfer the tags from any existing data, and link everything up. Can 
someone who has experience with such things suggest a workflow? 
Personally I tend to work with Potlatch2, but please let us all know if 
there's a better way. I assume (as someone else already suggested) the 
OS is probably the best source available for this data. So any existing 
admin boundaries (counties/regions etc) will need to be adjusted by hand 
to connect up with the district boundaries from this OS dataset.

I am currently uploading the GPX files to the following (temporary) 
location:
http://csmale.home.xs4all.nl/os/boundaryline/

Please let me know if you find any anomalies in these files!

Colin

On 30/05/2012 00:06, Ed Loach wrote:
>> It should only be attempted by an experienced mapper who is
>> familiar with
>> revert and other advanced techniques and can follow the guidelines
>> on the
>> wiki. The potential to break something is very great, so I would
>> question
>> making converted data available. Any conversion needs to build the
>> relations
>> so use something like 'ogr2osm' to create .osm files - a
> conversion to
>> GPX
>> will not do this.
> I'll second this. I used to run a boundary validation routine daily
> on the British Isles extract from Geofabrik. I stopped it at the end
> of March when I was expecting there to be no new extracts until
> after the licence change completed, but this thread had me run it
> again today. Previously I was fixing broken boundaries if they
> remained broken more than a week (in case people were still working
> on them), but towards the end of March decided to wait until the
> licence change process was complete as that is likely to break some.
>
> Anyway, at the end of March there were 16 admin boundaries listed
> here:
> http://www.loach.me.uk/osm/boundaries/
> (includes false positives at admin levels 2 and 4 as not all
> required ways are in the extract). As you can see this has roughly
> tripled in the last two months. Whether this is remapping stuff that
> has caused it or not I don't know.
>
> Ed
>
> PS: Note in some cases the "break" might just be an inconsistent use
> of roles on member ways.
>
>
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