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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