[HOT] Matthew

Blake Girardot HOT/OSM blake.girardot at hotosm.org
Wed Feb 22 14:08:16 UTC 2017

Dear Fred,

Thank you for the feedback.

It would help if you provided an actual area and not just an generic
link to osmose.

I did review all of NW Haiti for duplicate buildings which is what
seems to be the biggest issue and out of 68,000 buildings over
approximately 1500 sq/km found 470 duplicate buildings. ( graphic
https://screenpresso.com/=2eYrd )

Which is pretty good in my view, less than 0.7% error rate. Still it
would be good to fix them, especially since it is pretty easy to fix.

For an experienced mapper, it should take about 1 hour to fix them all.

I fixed 100 of them in about 15 mins the slow way :)

I would be happy to share my work flow for fixing them if that would
help you at all.

My only other comment is that if you are really interested in getting
the errors corrected, being a bit more understanding and respectful of
the volunteer mapper's efforts might motive people to dive in and
help. Phrases like "clean up your mess" is not a good approach in my
experience. "Hey, I found a lot of duplicate buildings, could we find
a way to get them corrected?" would probably have generated a lot more
volunteers to jump in and help.


On Wed, Feb 22, 2017 at 6:39 AM, FredM <frmoine at gmail.com> wrote:
> We are in training with student from Universite Nouvelle Grande Anse
> http://universitynouvellegrandanse.org/ and we are using drone et OSM.
> However, it is a lot of mistake done after the cyclone
> Have a look on osmose and check all  to see all duplicate building and other
> http://osmose.openstreetmap.fr/fr/map/
> Not so funny to start cleaning an OSM database when you start the mapping.
> All the best FredM
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Blake Girardot
Humanitarian OpenStreetMap Team, TM3 Project Manager
skype: jblakegirardot
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