[OSM-talk] Mali

John Whelan jwhelan0112 at gmail.com
Sat Jun 29 22:49:51 UTC 2019

I've been going over Mali adding in missing villages and hamlets working 
in the southern and eastern part of Mali and cleaning up as I go. Adding 
nodes to highways that cross but have no nodes, adding tags to untagged 
ways etc.  I even try to make sure each village has one highway at least 
leading to it.

However as I work west I'm coming across areas that have lots of 
buildings and lots of errors.  I've zapped more than a few hundred 
duplicate buildings.  I confess I have not put a comment on every 
changeset especially when the mapper has less than 30 edits.  I'm seeing 
three buildings mapped on top of each other by the same mapper.  One is 
untagged and its not just once.  Interestingly some of the changesets 
are tagged "untangling the spaghetti" and I have sympathy with that mapper.

In particular I'm seeing whole villages marked as a single building=yes, 
villages with highways that don't meet in the middle.  Villages 
connected by tracks which doesn't match up with the African Highway wiki 

Most errors are mapped by mappers with not that much experience.  The 
buildings in some ways are a nuisance as they both seem to be mapped 
from different imagery so often have been mapped crossing highways etc 
but the other problem is they fill the map so much so other features are 
difficult to spot like highways that don't quite meet.

Are there any local Mali mappers around to chat with to see if we can 
get something organised?  In particular we need the highway 
classification sorting out.  The African highway wiki is fine as far as 
it goes but something connecting a village to a highway comes out as 
unclassified especially if there are square roofs in the village.  In 
order to differentiate the highways that these connect to that connect a 
number of villages probably should be tertiary and the ones that connect 
towns and major villages probably something else.

However I'd be much more comfortable with some local mappers making 
these calls.

I'm not sure quite what to do.  It needs a more organized approach.  An 
Apple mapper has been in demoting highway=tertiary to unclassified and 
yes we did have a conversation however I'm fairly certain they are 
working remotely from imagery.


Thanks John

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