[HOT] Ebola Outbreak Nord-Kivu Building Geometry analysis

Sat Aug 11 13:25:02 UTC 2018

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.

Sent from Mail for Windows 10

From: hot-request at openstreetmap.org
Sent: 11 August 2018 13:09
To: hot at openstreetmap.org
Subject: HOT Digest, Vol 102, Issue 9

Send HOT mailing list submissions to
	hot at openstreetmap.org

To subscribe or unsubscribe via the World Wide Web, visit
	https://lists.openstreetmap.org/listinfo/hot
or, via email, send a message with subject or body 'help' to
	hot-request at openstreetmap.org

You can reach the person managing the list at
	hot-owner at openstreetmap.org

When replying, please edit your Subject line so it is more specific
than "Re: Contents of HOT digest..."

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.osm at gmail.com>
To: hot at openstreetmap.org
Subject: [HOT] weeklyOSM #420 2018-07-31-2018-08-06
Message-ID: <5b6dd6cd.1c69fb81.b291e.dc27 at 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 <pierzenh at yahoo.fr>
To: HOT Openstreetmap <hot at openstreetmap.org>
Subject: Re: [HOT] Ebola Outbreak Nord-Kivu Building Geometry analysis
Message-ID: <671296033.8126802.1533938656904 at 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 <pierzenh at 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 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/hot/attachments/20180810/4f99d903/attachment-0001.html>

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

Subject: Digest Footer

_______________________________________________
HOT mailing list
HOT at openstreetmap.org
https://lists.openstreetmap.org/listinfo/hot

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

End of HOT Digest, Vol 102, Issue 9
***********************************

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/hot/attachments/20180811/909ec3b1/attachment.html>