Hi Pierre,

One of the problems we face is that some very inexperienced mappers have been 
inadvertently marking task squares as validated and, while we are able to see 
in the Tasking Manager 3 how many squares that person has validated there is no 
mechanism in the Tasking Manager to identify those specific validated squares. 
This problem is being addressed at the moment with some urgency but, as with 
the Project 4947 that you used in your building analysis, although all the 
squares are validated some have not actually been checked properly and 
corrected. 

Once the means is there to identify all the task squares in a project that have 
been validated by an individual we will be able to reduce the percentage of bad 
buildings even further.

I am glad to see that you are developing the means for us to identify the work 
done by an individual mapper as this will make it easier for validators to 
assess the standard of that mapper’s work overall and thus give them the 
appropriate helping hand and encouragement to improve their standard and become 
our more experienced mappers of the future.


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To: hot@openstreetmap.org
Subject: HOT Digest, Vol 102, Issue 9

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Today's Topics:

   1. weeklyOSM #420 2018-07-31-2018-08-06 (weeklyteam)
   2. Re: Ebola Outbreak Nord-Kivu Building Geometry analysis
      (Pierre Béland)


----------------------------------------------------------------------

Message: 1
Date: Fri, 10 Aug 2018 11:17:49 -0700 (PDT)
From: weeklyteam <theweekly....@gmail.com>
To: hot@openstreetmap.org
Subject: [HOT] weeklyOSM #420 2018-07-31-2018-08-06
Message-ID: <5b6dd6cd.1c69fb81.b291e.d...@mx.google.com>
Content-Type: text/plain; charset="utf-8"

The weekly round-up of OSM news, issue # 420,
is now available online in English, giving as always a summary of all things 
happening in the openstreetmap world:

http://www.weeklyosm.eu/en/archives/10586/

Enjoy!

weeklyOSM? 
who?: https://wiki.openstreetmap.org/wiki/WeeklyOSM#Available_Languages 
where?: 
https://umap.openstreetmap.fr/en/map/weeklyosm-is-currently-produced-in_56718#2/8.6/108.3

------------------------------

Message: 2
Date: Fri, 10 Aug 2018 22:04:16 +0000 (UTC)
From: Pierre Béland <pierz...@yahoo.fr>
To: HOT Openstreetmap <hot@openstreetmap.org>
Subject: Re: [HOT] Ebola Outbreak Nord-Kivu Building Geometry analysis
Message-ID: <671296033.8126802.1533938656...@mail.yahoo.com>
Content-Type: text/plain; charset="utf-8"

If you are tired on the Talk list discussion about the gender of post codes, 
What's about OSM data quality ;)
Building Data quality Evaluation after Tasks are completed and validated is 
possible by the analysis of the Geometry of buildings.
For 3 jobs completed for the Ebola Response, you will find below links to 
Achavi. This will let you evaluate rapidly if this seems to satisfy OSM data 
quality standards.  Even if the Task manager indicates jobs as 100% validated, 
this seems to confirm that validators are demotivated and do not want to 
correct anymore imprecise building tracing from successive waves of one day 
contributors. 
Task 4947 https://tasks.hotosm.org/project/4947
https://overpass-api.de/achavi/?changeset=61276742https://overpass-api.de/achavi/?changeset=61275198https://overpass-api.de/achavi/?changeset=61348809
 
Task 4953 https://tasks.hotosm.org/project/4953
https://overpass-api.de/achavi/?changeset=61328699https://overpass-api.de/achavi/?changeset=61326934https://overpass-api.de/achavi/?changeset=61328228https://overpass-api.de/achavi/?changeset=61329550
 
Task 4958 https://tasks.hotosm.org/project/4958


https://overpass-api.de/achavi/?changeset=61443529
https://overpass-api.de/achavi/?changeset=61444639https://overpass-api.de/achavi/?changeset=61444931https://overpass-api.de/achavi/?changeset=61442032https://overpass-api.de/achavi/?changeset=61430587https://overpass-api.de/achavi/?changeset=61430407https://overpass-api.de/achavi/?changeset=61445212https://overpass-api.de/achavi/?changeset=61444521https://overpass-api.de/achavi/?changeset=26850026https://overpass-api.de/achavi/?changeset=61424772https://overpass-api.de/achavi/?changeset=61475962https://overpass-api.de/achavi/?changeset=61430375https://overpass-api.de/achavi/?changeset=61443320https://overpass-api.de/achavi/?changeset=61475863https://overpass-api.de/achavi/?changeset=61457626https://overpass-api.de/achavi/?changeset=61457938https://overpass-api.de/achavi/?changeset=61441962https://overpass-api.de/achavi/?changeset=26836962https://overpass-api.de/achavi/?changeset=61400757https://overpass-api.de/achavi/?changeset=61445511https://overpass-api.de/achavi/?changeset=61382566https://overpass-api.de/achavi/?changeset=61459080https://overpass-api.de/achavi/?changeset=61413766https://overpass-api.de/achavi/?changeset=61459214https://overpass-api.de/achavi/?changeset=61387946https://overpass-api.de/achavi/?changeset=61458807https://overpass-api.de/achavi/?changeset=61457301https://overpass-api.de/achavi/?changeset=61478282https://overpass-api.de/achavi/?changeset=61458243https://overpass-api.de/achavi/?changeset=61438842https://overpass-api.de/achavi/?changeset=61414264https://overpass-api.de/achavi/?changeset=61445007https://overpass-api.de/achavi/?changeset=61430147https://overpass-api.de/achavi/?changeset=61384777https://overpass-api.de/achavi/?changeset=61475989https://overpass-api.de/achavi/?changeset=61421482https://overpass-api.de/achavi/?changeset=61458523https://overpass-api.de/achavi/?changeset=61441754https://overpass-api.de/achavi/?changeset=61425864https://overpass-api.de/achavi/?changeset=61389859https://overpass-api.de/achavi/?changeset=26848029https://overpass-api.de/achavi/?changeset=61443898https://overpass-api.de/achavi/?changeset=61444362
regard 
Pierre 
 

    Le jeudi 9 août 2018 16 h 14 min 25 s HAE, Pierre Béland 
<pierz...@yahoo.fr> a écrit :  
 
 I published a Blog post about a tool that Potentiel 3.0 develops with OSM-RDC 
to classify Building geometry and  to spot the more problematic contributions. 
Topological analysis is made from a PostgreSQL - PostGIS database.See 
https://opendatalabrdc.github.io/Blog/index.html#!Bulding_Geometry_Analysis_to_Support_OpenStreetMap_Quality_Analysis.md
I have looked at task 4947 that was completed august 6. I From the 18312 
buildings in the area covered by this task, only 3.5% have irregular form 
(other then 90 degres or regular angles like huts).  There exist buildings with 
irregular form but they are the exceptions. 
The objective with the focus on the analysis of these irregular buildings, is 
one more angle to validate the OSM mapping. First, we can have rapidly a 
quantitative measure of irregular polygons to look at more closely. This also 
let's validate the more problematic contributions. 
The Overpass query links provide a list of buildings that are still reported as 
irregular today for the contributors with significant buildings flagged as 
irregular. Each query concern one contributor and a rapid look at each shows 
imprecise mapping. I would like the validators to look at this data and comment 
about how the focus on such data can help in the process of validation / 
correction of the mapping done for this Ebola response.
http://overpass-turbo.eu/s/AWchttp://overpass-turbo.eu/s/AWdhttp://overpass-turbo.eu/s/AWehttp://overpass-turbo.eu/s/AWfhttp://overpass-turbo.eu/s/AWghttp://overpass-turbo.eu/s/AWhhttp://overpass-turbo.eu/s/AWihttp://overpass-turbo.eu/s/AWjhttp://overpass-turbo.eu/s/AWk

regard 
Pierre 

  
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