[HOT] Task manager description/instructions #591

Blake Girardot bgirardot at gmail.com
Sun Jan 4 23:16:20 UTC 2015

Wow, great resources.

I was looking for something like these for a mapping party recently.

Thank you, thank you, thank you for sharing them!

Would you mind if we put a few in the wiki or on LearnOSM with reference 
back to the source?


On 1/4/2015 5:30 PM, Pete Masters wrote:
> Hi all, this is an interesting thread for me as we realised pretty
> quickly at the Missing Maps mapathons that we needed to work out how to
> improve quality, while keeping the number of new mappers attending high.
> I'd like to share some experiences, but apologies if you've heard them
> before. I've only been on the HOT list since June...
> Context talks and tutorials: We have short talks at the beginning to
> introduce mappers to the country they are to map. This is immediately
> followed by a tutorial from a HOTty for new mappers (using iD). These
> tutorials have been vital since the first Missing Maps mapathon we did
> in July and give the newbies a great place to start. However, it is not
> uncommon for newbies to forget fundemental things very quickly. The
> tutorial from November mapathon is here:
> https://docs.google.com/presentation/d/1Q2GqxWXyyOsP7t7GOrZAMttg4NbpK-xe5iB8v4iOeno/edit#slide=id.p
> Table top resources: The Maps Team at the British Red Cross have
> developed a load of different printable materials to go with the
> mapathons. There are various materials here and they help mappers
> overcome some of the more frequent problems they encounter. These are
> kept on google drive and anyone is more than welcome to take what they
> think might be useful.
> https://drive.google.com/open?id=0B_hW0KstPK1AenJDbDRFemtuMkU&authuser=0
> If you do develop any of these materials, please do make a new folder
> and share them back on the same drive.
> Images: We have also tried collecting images of the places being mapped
> to help mappers interpret what they are seeing on the satellite imagery.
> This has only recently been piloted, but some mappers have said it is
> useful, especially where traditional building techniques are used that
> make buildings hard to identify by someone from the UK! Pinterest boards
> can be found here: http://www.pinterest.com/MissingMaps/
> Validator tables: In the last couple of events, we have set aside a
> validator table and invited the more committed, regular Missing Maps
> attendees to learn validation (Laura who started this email chain is one
> of them!). They sit with one or two experienced validators and review
> the squares being done by people in the room. This has two benefits.
> Firstly, we are (hopefully) training up some more validators for HOT
> tasks (as they seem to be in short supply) and secondly, as these
> validators spot repeat errors, they can actually go and find the mapper
> in the room and help them put it right.
> Last thing (and apologies for the length of this), on John's thoughts on
> multiple passes for tasks... We have tried a two stage tasking process
> when tracing in the Bangassou region of CAR. Because the area has a lot
> of small villages spread over a wide area, we did one task (using large
> squares) to trace the road networks. Then in the second task, we
> identified residential areas and fed them into the tasking manager as a
> geojson and set up building tracing using small squares. The feedback we
> got suggested that this was an efficient way of handling an area of this
> size.
> Tasks
> Roads : http://tasks.hotosm.org/project/749
> Buildings : http://tasks.hotosm.org/project/748
> Right, sorry for going on for so long. Look forward to more chat on this
> subject...
> Pete
> *Pete Masters*
> Missing Maps Project Coordinator
> +44 7921 781 518
> _ at pedrito1414_ <https://twitter.com/TheMissingMaps>
> _ at theMissingMaps_ <https://twitter.com/TheMissingMaps>
> _facebook.com/MissingMapsProject _
> <https://www.facebook.com/MissingMapsProject>
> Although I check emails more frequently, I work two days a week on the
> Missing Ma ps Project – if you want to catch me, _see this calendar_
> <https://www.google.com/calendar/embed?src=ui161p5fak6u6h3oq23824cgj0%40group.calendar.google.com&ctz=Europe/London>.
> -----Pierre Béland <pierzenh at yahoo.fr> wrote: -----
> To: "bgirardot at gmail.com" <bgirardot at gmail.com>, john whelan
> <jwhelan0112 at gmail.com>
> From: Pierre Béland <pierzenh at yahoo.fr>
> Date: 02/01/2015 07:03PM
> Cc: "hot at openstreetmap.org" <hot at openstreetmap.org>
> Subject: Re: [HOT] Task manager description/instructions #591
> It certainly simplifies to first trace the major roads. We did sometimes
> trace in priority these roads, then landuse before mapping more in
> detail. But this is Crisis management and we seldom have time to proceed
> this way. We sometimes try to have the more experienced mappers to take
> care of such tasks.
> One area were I see that we can make progress controlling the mapping
> qality is with the Mapathons. There were many Mapathons this fall,
> either for the Ebola outbreak or for the Missing Maps project. This
> brings a lot of new contributors learning how to map, making a lot of
> mistakes that need later to be corrected.
> A Mapathon Guide would help to provide tools for the organizers to take
> care of the quality of the data and exchange with the participants to
> realize the various mistakes and the good practices (ie. Imagery
> interpretation, geometry, tags, etc.).  This would be also more
> stimulating for these new contributors and help to keep more of them on
> the long term.
> A tool like http://overpass-api.de/achavi/ could help. Some Overpass
> queries would also let monitor various layers such as buildings,
> landuse, roads.  This would both show the progress made and highlight
> what should be corrected.
> Pierre
> ------------------------------------------------------------------------
> *De :* Blake Girardot <bgirardot at gmail.com>
> *À :* john whelan <jwhelan0112 at gmail.com>
> *Cc :* "hot at openstreetmap.org" <hot at openstreetmap.org>
> *Envoyé le :* Vendredi 2 janvier 2015 10h57
> *Objet :* Re: [HOT] Task manager description/instructions #591
> On 1/2/2015 3:41 PM, john whelan wrote:
>  > How can we make the best use of what we have?  I wonder if some sort of
>  > work flow might be better.  Pass 1, do the major roads and towns /
>  > larger villages, Pass 2 rivers, pass 3 tracks, pass 4 forests etc.
>  > Perhaps rivers should come first?
> Yes, this is for sure a good idea. Difficult to do in practice, but a
> good idea.
>  >Certify the mappers, self
>  > certification would be fine but a small training course this is how to
>  > map a road, this is how to map a village, this is how to map a river,
>  > this is how to map a building (JOSM building tool?).
> Again, a very good idea, and the Training WG is considering something
> like this.
> None of the typical mapping tasks are difficult to do, but a little bit
> of specific training, like 30 mins worth, can make a huge difference
> between something that is mapped and something that is well mapped.
> It would really be great if we had a small training programing of some
> sort, I think it could all be done on line with text and images. Again,
> the Training WG is working on this idea so if anyone is interested in
> helping with it please let us (training wg) know.
> Or we could run online workshops for an hour or so to do mapping
> training. At this point I have done 8 or 9 online training sessions and
> they work out pretty well (I think :). I have also been very lucky and
> received online training from Andrew Buck and Pierre Béland which was
> immensely helpful.
>  > At the moment we seem to have a number of different people going over
>  > the same ground mapping the same things which to me is a waste of
>  > resources and no real agreement as to when a tile is complete, ie no
>  > service level agreement.  I've even seen a building mapped over a
> building.
> Yes and no about the waste of resources. The system is designed so that
> multiple eyes will look at the mapping. The obvious version of that is
> the validation process, but even that needs multiple passes to make sure
> things are validated correctly.
> Project managers can "validate the validations" and experienced mappers,
> currently self-selected, can also "validate validations".
> But multiple projects over the same area for either updates to imagery
> or different mapping focuses (roads, waterways, etc) will lead to
> validation of previous validations as well so there is a real benefit to
> what seems like a waste of resources.
> Just 2 passes over an area (initial mapping + validation) is not enough
> to generate the highest quality data possible. In my experience so far a
> minimum of 3 passes is needed to be sure you are getting high quality
> data and the 2nd and 3rd passes are almost as much work as the first pass.
> Project managers or local OSM groups often give the mapping 3rd and 4th
> passes to correct and refine the initial mapping data as well.
> With a simple and short training program for different types of mapping
> things would improve some.
> Thanks for the thoughts John.
> cheers
> blake
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