Hi John,
In Overpass-turbo, with the following Query it is possible to select any bbox 
and extract.  The query will retain only buildings where duplicated tag on the 
chlid nodes. For this example in N'Djamena, other then the duplicate, we see 
that the OSM contributor added various unnecessary tags on the 
nodeshttp://overpass-turbo.eu/s/A9c
example  <node id="2690769234" lat="12.1258219" lon="15.0788203" version="1" 
timestamp="2014-02-26T07:23:11Z">
    <tag k="building" v="cle"/>
    <tag k="date" v="25/02/2014"/>
    <tag k="source" v="bING"/>
  </node>
 
Pierre 
 

    Le dimanche 8 juillet 2018 10 h 11 min 23 s HAE, john whelan 
<[email protected]> a écrit :  
 
 I'm seeing a fair number of these especially in CHAD.  Could someone do an 
overpass or whatever to see how big a problem it is? 

and they were done months ago by mappers who haven't mapped recently.

Thanks John
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