[HOT] Is HOT planning to validate this 4 year old project?

[john whelan]

I've had a quick look at Tanzania.  A  roughly10% sample shows 2,385
duplicate buildings, or about ten times the number I would expect to see.
I can work my way through them but it is a much higher level than one might
like to see and my osteoarthritis in my mouse finger doesn't help.

Cheerio John

On Fri, 17 Dec 2021 at 14:57, Ralf Bernhardt <raabee at gmx.de> wrote:

> https://tasks.hotosm.org/projects/834 still active, validation and
> remapping is taking place now. Some mappers are mapping with outdated
> imagery, others are not capable to deal with existing data.
>
> https://tasks.hotosm.org/projects/1788 already archived, completely
> validated and mostly overlapping with
> https://tasks.hotosm.org/projects/834. How is this possible?
> Btw. the road network is absolutely unusable and it is not likely to get
> better.
> https://www.openstreetmap.org/#map=17/-1.86318/34.72184
>
> https://tasks.hotosm.org/projects/6182
> some destructive beginner edits recently. Who cares?
>
> #mapwithai #Tanzania
> https://www.openstreetmap.org/#map=18/-4.98441/32.99881
>
> Picking some changesets and looking into the data you'll learn more than
> with any statistic.
>
> ...
>
> Am 17.12.21 um 13:16 schrieb Benjamin Herfort:
>
> Hey,
>
> just adding a few thoughs on validation and OSM data quality implications.
> It's true that there are probably still to many projects in the Tasking
> Manager that have not been validated. On the other hand, it is also
> important to acknowledge that over the past years validation efforts have
> been improved. (Probably not to the level everyone would like to see it,
> but at least it goes into the right direction.) And there are many
> volunteer validators that work on that every day.
>
> The MapSwipe community and HeiGIT are currently working on a project
> funded by American Red Cross, which will allow MapSwipe users to validate
> OSM building footprints. I've briefly talked about this at this years HOT
> summit. It's clear that this will probably not help us to prevent low
> quality buildings edits in the first place. But maybe this new MapSwipe
> project type can help us to validate Tasking Manager projects quicker or at
> least provide a new way to find out which buildings need a validation /
> correction. (During the HOT summit talks there were also many other
> discussions around validation and how it can be supported by more
> analytics.)
>
> For some background information: You can check Tasking Manager stats on a
> HeiGIT's Humanitarian OSM Stats page:
> https://humstats.heigit.org/statistics.html If you scroll down to the
> "Recent Performance" section you get an overview on the share of Tasking
> Manager activity that went into mapping and validation. Ideally the dark
> blue bar would be even bigger than 50%, which would mean that more tasks
> get validated than are newly mapped. If you like you can check this also
> for a few organisations such as Crowd2Map (Tanzania Development Trust) or
> Doctors Without Borders (MSF), which are doing relatively well in regard to
> validation.
>
> Finally, we can also check which projects have been mapped, but not
> validated and are already rather old. E.g. download this file:
> https://humstats.heigit.org/api/export/all/project_progress_sessions_centroid.geojson
> and filter in QGIS:
>
> "progress_mapped" > 0.9 AND "progress_validated" < 0.1 AND
> "start_activity" <= '2017-01-01'
>
> This will give you a list of around 200 projects which are created before
> 2017, mapped to minimum 90% and validated to less than 10%. I'm pretty sure
> that there are other people here in the community that have similar
> approaches to identify these projects. Maybe there is something in the
> Tasking Manager already, I'm not aware of as well.
>
> Have a nice day,
>
> Benni
>
> PS: I've sent that message yesterday already containing some figures, but
> it seems that it didn't get through properly.
>
> disclaimer: I'm working at HeiGIT and are also heavily involved with
> MapSwipe.
>
> On 15.12.21 15:56, John Whelan wrote:
>
> I've run over the area and deleted a couple of hundred duplicate
> buildings.  The problem with validating buildings is it takes longer to
> validate them than map them using JOSM's buildings_tool plugin.  Given teh
> imagery is often fussy ad the buildings do not generally line up with all
> the imagery they are a pain in the neck to do.  So not formally validated
> but has been cleaned up.  My person view is the NGO are after building
> counts to get an estimated population so a simple rectangle would suffice
> for their purposes.
>
> One other thing I noticed was courtyards in the center of a building.
> Fairly common but how  do you may them and more importantly explain to a
> new mapper how to map them?
>
> Cheerio John
>
> Mateusz Konieczny via HOT wrote on 12/15/2021 3:24 AM:
>
> https://tasks.hotosm.org/projects/3431
>
> I encountered more garbage data added on instructions of HOT.
>
> This is not a problem by itself, as with new mappers it will occasionally
> happens.
>
> The problem is that after four years it is still not validated.
>
> I would strongly recommend that HOT would use more of its resources
> on validating already made edits rather on adding more things.
>
> Is there some plan to actually validate edits organized by HOT?
>
>
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