[OSM-talk] Fixing broken multipolygons, some notes

Andreas Vilén andreas.vilen at gmail.com
Mon Mar 20 05:27:05 UTC 2017

There is a difference between data errors that the osmi will detect and bad quality map data. Corine is the latter.

It's not up to me to decide if this data is to be deleted or not. If you want to do that, raise the question with each respective country's mailing list.


Skickat från min iPhone

> 19 mars 2017 kl. 19:32 skrev Christoph Hormann <osm at imagico.de>:
>> On Sunday 19 March 2017, Andreas Vilén wrote:
>> Also, as has been pointed out earlier, Corine data might be bad, but
>> does not contain that many pure data errors as we define them.
> That is not quite accurate in my experience.  As i explained in
> https://lists.openstreetmap.org/pipermail/talk/2017-February/077553.html
> landcover mappings like corine are based on selecting the least unlikely 
> of a fixed set of landcover classes at a certain scale based on certain 
> criteria and reference areas and this frequently produces completely 
> bogus results.
> In areas like here:
> http://www.openstreetmap.org/#map=13/56.7935/16.0168
> http://www.openstreetmap.org/#map=13/62.7015/25.6678
> the Corine based landcover data in my eyes has not connection to reality 
> at all, it is factually simply wrong.
> I understand that the perspective to loose all the data and to be 
> without any forest mapping until manual mapping has filled the gaps 
> seems not so pleasant but i am pretty sure there are a lot of people 
> from abroad who would be glad to help you with either manual forest 
> mapping or importing better quality data in a way that is better 
> maintainable and more compatible with manual mapping activity.
> However as long as the bad quality Corine data is there and meant to 
> stay few people are interested in editing this mostly meaningless data.
> -- 
> Christoph Hormann
> http://www.imagico.de/
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