Very interesting findings and recommendations, Pierre!
I find it very useful to have some numbers like that, not only vague
recommendations regarding education.
Best regards - Franz-Josef
Am 07.12.2018 um 06:02 schrieb Pierre Béland:
The media reported recently about the current Ebola outbreak in Nord
Kivu and the difficulty for the humanitarians to operate in a
difficult security context with rebels around towns plus population
displacements in response to various attacks.
After Beni, the efforts are now concentrated around Butembu. The
population of this town is increasing rapidly.The DR Congo health
department, the World Health Organization and MSF need good
evaluations of population for vaccination campaigns. In this context,
OSM-DRC has obtained recent imagery courtesy of USAID that shows many
new buildings.
We would like assure a quick response but are faced with quality
problems. This week, we started new a job for Bulembo, east of Butembo
with new imagery. https://tasks.hotosm.org/project/5585
With good imagery and a rural area, it seemed to us that this job
would fit for newbies. But we rapidly observed on the map more and
more overlaps and imprecise building tracing.
We then used the Irregular shapes indicator that we developped a few
months ago to quantify these problems. The indicator offers us a
measure of the problem and let us validate the individual buildings
reported as needing close evaluation of builidings quality problems
(shapes + overlaps).
https://opendatalabrdc.github.io/Blog/#!index.md
<https://opendatalabrdc.github.io/Blog/#%21index.md>
Looking at project 5585, we observe :
- on dec.5 with beginners, participation, 3,025 buildings were edited
but 40.2% with irregular shapes
- on dec.6 with beginners excluded, 3,471 buildings were edited with
only 0.9% with irregular shapes.
The OSM-DRC coordination team is also faced with a high ratio
builidngs bad quality + overlaps for the densely town of Butembu : TM
5485, 5487 and 5507.
This is caused by various factors, including dense urban area, dark
imagery, different offsets between imagery plus often very imprecise
building tracing from newbies. Observing the multiplication of
problems this week for Butembu, including a high ratio of building
overlaps with roads, we have decided to archive the current jobs for
Butembu. The option seems to start over with the new imagery and first
realign buildings and roads before adding new buildings. And the jobs
would be reserved to experienced mappers. The Tasking manager offers
options to select intermediate contributors. We should add jobs in the
next days to revise Butembu.
We also need to discuss how to better integrate the participation of
the newbies in disaster mapping and at the same time assure both a
quick answer and high quality. Solutions should be proposed to assure
that newbies receive an adequate training and how to better monitor
their participation. As coordinators of the response, we dont know
where from the newbies come from. Are they simply coming and select a
task or participate to a mapathon ? This is hard to say.
Mapathons might be the solution to better supervise newbies
participation. But this only if the mapathons organizers accept the
responsability to provide high quality data for their group, to offer
more training and assure more monitoring of their participants.
regard
Pierre
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