[Tagging] Mapping deforestation

Christoph Hormann osm at imagico.de
Mon Mar 11 23:19:54 UTC 2019

On Monday 11 March 2019, Peter Elderson wrote:
> Sorry, 2000.

IIRC the saying is "two wrongs does not make a right".

Original use of tags with the landcover key, that is mappers creating a 
new geometry with a landcover tag, is as follows (based on data from 

72848 ways/relations (more of half of these created in organized mapping 
with tagging not being the free choice of the mapper)
1310 different users
494 of which have used the key exactly once (this, i.e. that about 1/3 
to half of the genuine active users of a tag have only used it once is 
pretty standard but still this has to be kept in mind when 
contemplating such numbers)

The reason why taginfo reports only the number of users who have last 
touched features with this key is not because this is particularly 
meaningful information but because this can be counted quite easily 
when processing a planet file (which is what taginfo does on a daily 
basis) while numbers on active users (i.e. who maps features with a tag 
or who adds a tag to features) can only be determined from the history.

I can highly recommend Frederik's talk on the matter of OSM statistics 
which discusses this in detail:


Christoph Hormann

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