[Imports] Hydrographic data import from LINZ

[Mateusz Konieczny]

Oct 24, 2021, 03:45 by K.y.l.e at outlook.co.nz:

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> > How crevasses can be in rock outside glacier?
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> I think the extent of the glaciers from the ADD import don’t quite match the glaciers that LINZ has surveyed.
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> There seem to be only a few cases like this, right at the edge of the glacier, we can delete these if you like.
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The question is 
- is glacier area data incorrect?
- is remaining creevace data of the same low quality? Just not obviously detectable?
If this was missed - what else was not properly reviewed?

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> > How you plan to update this data?
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> Using the same system as the ongoing address update, you can try it yourself from > https://osm-nz.github.io/RapiD
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> It can handle the complex aspects like moving, editing, and deleting data.
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So OSM would be reduced to mirroring some official dataset? 
With the most glaring errors hidden but remaining data hidden?

> > Primary effect is to make this area uneditable.
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> Not sure what you mean by this. This area is just as editable as any other part of the world, bearing in mind the lack of good quality aerial imagery.
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Primary problems caused by low quality imports range from
- many mappers especially new are unaware that low quality data mismatching reality,
especially imported data, can be freely deleted
- even if they aware of this - it is often very tedious to do this, especially for new people
- in general people are often far more motivated by mapping something new
over repairing garbage

Obviously all of that applies only to bad imported data, imports of data that is as 
good as people would map are extremely helpful.

But I was editing in some places where for example people imported massive 
forest multipolygons (thousands of elements) or import of the same features was done
multiple times or import utterly mismatched reality or someone imported data that
actually no longer existed.

It was confusing and miserable experience and for someone new it would be 
likely enough to completely discourage them from contributing.

I also encountered many requests, even from long term mappers to
help with areas especially affected by imports that made editing nearly impossible
in a given area.

If you are unaware that bad import can heavily damage editability and
you are not taking this into account then I would strongly encourage
to avoid doing this Hydrographic data import from LINZ.

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> > Also, I want to repeat request for linking specific posting on mailing list that announced plan to import this features.
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> > Changesets that mass added this features miss links to relevant import documentation.
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> I think I answered all this in our other conversation, in addition, here is the link to talk-nz which I didn’t include > https://lists.openstreetmap.org/pipermail/talk-nz/2021/thread.html
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> All changesets made after 6/10/21 have source=> https://wiki.osm.org/LINZ> , in addition to attribution=> https://wiki.openstreetmap.org/wiki/Contributors#LINZ>  which they always had. I hope this addresses that problem.
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I am asking about announcement on imports mailing list. It is obligatory and gives
people to stop harmful imports. And as far as I know imports that failed this requirement
can be freely reverted.

(I understand that small local and uncontroversial imports are often not doing this,
and in such case such reverts would be unhelpful, but it is not one of such cases)
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