[HOT] Task 1238 Canaan Important Deletion of existing objects

[Dale Kunce]

Pierre,
Because of the difficulty in keeping the Canaan area up to date, due to the
rapid urbanization. And a number of recent mapping incomplete efforts ARC
used imagery from September of this year to complete a full QA/QC of the
Canaan area, this included correcting spatial accuracy and updating
building footprints. We spent an entire month of staff time performing this
QA. The data is essential for a coordinated project we are doing with
multiple partners.

Can you confirm the date on the drone imagery? I was told that imagery
flown in 2015 was lost due to a malfunction on the OSM-FR servers. Is this
imagery available? Please be very mindful of the date flown as even a month
can show major changes in the area.

I highly suggest mapping the campeche or onaville areas for the mapathon.
Both projects have up to date high quality satellite imagery and are in
need of more love than central Canaan at the moment.

As always feel free to reach out to me directly if you have further issues
or questions?

Dale

On Fri, Nov 20, 2015, 1:32 PM Pierre Béland <pierzenh at yahoo.fr> wrote:

> Being in Port-au-Prince for a Training session of the Haiti OpenStreetMap
> community (Espace OSM francophone project), I collaborate this week with
> the Haiti OSM community who have monitored urbanisation progression in the
> Canaan sector, providing UAV imagery in 2013, 2014 and 2015 (60% of the
> zone covered so far).  They have also added to osm the building footprints
> in the area from precise and accurate imagery (4 cm precision).
>
> We organize a mapathon tomorrow to revise the Canaan zone using the
> November 2015 imagery available and monitor the progress of rapid House
> contruction in this sector.
>
> Planning the work, I see today that one contributor did most of Tak 1238
> for Canaan Haiti and it seems deleted systematically buildings before
> redrawing them.  In JOSM if I download buildings and search for newly
> created buildings (ie version:1), most of the buildings have version=1.
>
> If this is exact, we should note that this is contrary to the OSM
> philosophy. The rule that we generally follow at OSM to respect previous
> contributions and keep history, is to revise geometry and not delete /
> retrace.
>
> For these two changesets alone, I count 50 and 44 ways deleted.
> http://www.openstreetmap.org/changeset/35462043
> http://www.openstreetmap.org/changeset/35462424
>
> At the same time, many buildings are missing. Since I have no comparizon
> with the situation before this mapping, It is hard to say what was done
> exactly, if any building were erased and not replaced.
>
> Could somebody confirm that buildings were systematically deleted before
> retracing. What should we do to correct rapidly this situation before we
> start the mapathon tomorrow?
>
>
> Pierre
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