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

[Kyle Hensel]

Hi Alwyn,

I agree that vegetation succession is a problem in OSM - I've seen bush mapped as natural=scrub 10 years ago which has grown so much that it should now be tagged as natural=wood.

In terms of landuse and vegetation, only the tree-row layer remains to be imported. All other landuse/vegetation layers are over 95% complete.
The other remaining layers are mostly human-made features (like masts, fences, quarries), and the big one: rivers.

There is still an issue that some of this data will be out of date in a few years time.
To mitigate this, one thing we are doing differently this time is adding an OSM tag called ref:linz:topo50_id to every imported feature.
This tag contains the ID used by LINZ to identify that node or area.

This will allow mappers in 5 or 10 years time to compare the data in OSM with LINZ's data, to identify which features have been removed, edited, or recently added.
We know it’s possible to efficiently compare LINZ and OSM’s data using the ref:linz:topo50_id tag beacuse we already do this monthly for street addresses.

I hope this will prevent the issue you described from occurring with these new layers.
Let me know if you’ve got questions

Kyle

From: Alan Jamieson<mailto:alwynwellington at gmail.com>
Sent: Friday, 10 September 2021 16:16
To: talk-nz<mailto:talk-nz at openstreetmap.org>
Subject: [Talk-nz] Continuing the import of LINZ data into OSM

My limited experience is to note elements typically dated to 2012 or earlier

For items that refer to the natural environment, such a rivers and
vegetation, I regulalry note recent aerial imagery has ''moved on'' from
what was imported .

With rivers the import might have included gravel banks. Typically these
change their position each wet season.

In my experience, vegetation, especially in places with little or no
human activity, openings and scrub had become, or was tending to natural
wood, or similar.  And many areas marked as ''managed forest'' tended to
be pine plantations that had now passed their use by date (were not in
fact managed).

My suggestion is imports be only for the built environment.

--
nga mihi

Alwyn


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