Changeset: 61293082
Unmaintainable giant MP splitted into smaller polygons
Closed by mapwitch
Tags
created_by | JOSM/1.5 (14066 de) |
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source | Bing Images |
Discussion
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Comment from imagico
Thanks. That's a very good deed.
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Comment from mapwitch
:-D
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Comment from BladeTC
Why? I had a lot of work cleaning up the mess around the Amazon's River, unified all the relations, so now you split it all again?
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Comment from imagico
Riverbank polygons should always be split into relatively small, easy to handle parts. Large riverbank polygons are difficult to edit and to properly verify for validity for the mapper and more difficult to handle for the data user, they break much more frequently than small polygons and with much more severe consequences.
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Comment from smaprs
It's said: if it's not wrong, don't fix it. Was it wrong?
Also, I suppose it should've been discussed, as usual in OSM, at local, brazilian, community, before undoing Blade's huge work, since he has shown us his results and found no opposition. Right? -
Comment from imagico
No one has undone any mapping work here, mapwitch has just split a non-maintainable giant multipolygon stretching over thousands of kilometers, without doubts the largest riverbank polygon in the database, into smaller, easy to handle parts. There is no loss in information and mapping work involved in that. This is completely in line with established mapping practice world wide and a very positive contribution making future edits in the area much easier.
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Comment from mapwitch
I*ve done this work because the original MP had a note saying "This unmaintainable giant MP has to be split".
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Comment from BladeTC
They should have discussed with our local community, leaving a comment in one of the changesets used to create this multipolygon.
We would find have a way to approach the problem, and worked together to fix it.
I take care to preserve past works, like the relation 4110, but it was deleted.
I know this river is huge, but it is unique, by its nature and size. It has a relevance in the OSM to remain as it was. -
Comment from imagico
This is only unique in the way that this is the only place on Earth where anyone attempted to aggregate such a huge extent of riverbank mapping into a single multipolygon. Most other places where this was tried elsewhere (which are very few) are all several orders of magnitude smaller and even there the multipolygon usually suffers from being constantly broken.
The fixme note for the Amazon riverbank multipolygon being too large and that it should be split was added half a year ago by me. The first split into two parts happened two months ago in:
https://www.openstreetmap.org/changeset/59875449
which was not ideal since it created two new relations instead of splitting off one from the existing one. But dealing with this kind of giant MP relations is difficult so this is an understandable mistake. mapwitch simply further split one of the parts (which was still extremely large on its own) into manageable chunks.
So this was not a surprising ad hoc edit, it was done in several steps over multiple months by several people based on mapping practice widely used also in this country.
And splitting large polygons for riverbanks or landuse into smaller ones is not something that usually requires advance discussion. This is a good faith edit intended to make future mapping easier.
I think it is great that you care about the Amazon river mapping but you should recognize i think that those who have edited the riverbank polygons from abroad have done so with good intentions and good reasons for making their edits.
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Comment from smaprs
Next time please communicate good intentions of huge changes previously to local community, if there is one, in common channels: talk, osm-forum. And to previous editor. That's good practice, as told in OSM.
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Comment from ファシズム
Don't care for smaprs. He is a typical self-opinionated person.
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