[Talk-nz] Continuing the import of LINZ data into OSM

[Andrew Douglas-Clifford]

Hi Kyle,

Thanks for putting together the details on this. I haven't been involved in
some of the older LINZ imports (only the recent building imports via
RapiD), but I have seen the results of various older imports.

I think it might be useful to classify datasets by *how* they should be
imported into OSM. Many of these seem simple enough via a bulk import,
while others will require varying degrees of review/modification as they
are imported (as some of your notes indicate). For these, that might mean
taking the approach of importing/reviewing manually via RapiD instead of
the previous methods used, to ensure it's done appropriately.

Some thoughts around specific datasets:

   - *Rivers*: I believe this may be quite complicated for a simple bulk
   import. I've seen somebody's previous messy import examples (e.g. Mackenzie
   District around the Tekapo area) that have taken some work to clean up,
   where the large multitudes of line segments have an incorrect
   direction, meaning the flow direction is topologically incorrect. Also,
   river lines do not always have a continuous path through wider bodies of
   water. Perhaps with the named rivers dataset imported pre-dissolved and
   with the correct direction will help with this - but this will need manual
   review, perhaps by catchment?
   - *Peaks/Height Points/Place Names: *There are quite a few peaks/place
   names added already, assume the import will only add those that are missing
   from OSM? I also made an effort to add the geographic LINZ place names
   (town through to locality) that weren't in OSM previously, so imports would
   obviously need to conflate with existing data. Don't see why all height
   points couldn't be imported though, given the use of OSM for many outdoor
   applications.


Cheers,

Andrew
andrew_dc



On Sat, Aug 21, 2021 at 9:20 PM Kyle Hensel <K.y.l.e at outlook.co.nz> wrote:

> Hi all, I hope everyone is safe during lockdown...
>
>
>
> I've noticed that the import of topographic data from LINZ was never
> completed. This took place between 2008 and 2014. During this time, the
> majority of topographic data from LINZ was imported into OSM. Since 2014,
> only addresses and building outlines have been/are being imported.
>
>
>
> I've put together a proposal to continue importing 41 of the remaining
> data layers from LINZ.
>
>
>
> I've updated the OSM Wiki page to provide an overview of what data is and
> isn't in OSM, and the OSM tags used for each layer.
>
> This is available here: https://wiki.osm.org/LINZ The proposed new layers
> are marked as "🔵 Ready to Import" in the table.
>
>
>
> I'd love to hear what everyone thinks about this proposal.
>
> In particular, the proposed OSM tags for the new layers are just a
> suggestion - some of the choices are not straightforward and definitely
> need discussion.
>
>
>
> Best regards,
>
> Kyle
>
>
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>
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