[HOT] How newer mappers can help a lot with the validation process

Nick Allen nick.allen.54 at gmail.com
Thu Feb 11 16:19:22 UTC 2016

There is a wiki article at

It needs updating.

Nick (OSM=Tallguy)
my phone is responsible for any spelling mistakes!
On 11 Feb 2016 15:49, "john whelan" <jwhelan0112 at gmail.com> wrote:

> In there somewhere in a wiki or some such where we can document
> validation, what works and why and what to look for?  Perhaps put down some
> sort of service level agreement ie after validation we are only looking for
> what is requested in the instructions and for a JOSM validotian to be run.
> We expect 97% of settlements to be mapped type thing? That way people who
> wish to validate have something to feel confident about.
> We need to get more people into validation.
> Thanks
> Cheerio John
> On 11 February 2016 at 09:56, Jo <winfixit at gmail.com> wrote:
>> If such a volunteer becomes more confident after a while, they shouldn't
>> hesitate to actually validate the task, if all was mapped well and they
>> didn't have to add/change much.
>> When I look at finished tiles, I start with the intention to validate it.
>> If I have to do too much work on it, I will sometimes simply unlock once
>> again, either leaving a note it's actually complete now.
>> If there is still more work than I have time for at that time, it's
>> better to "invalidate", so another mapper knows where more work is needed.
>> Polyglot
>> 2016-02-11 14:47 GMT+01:00 Blake Girardot <bgirardot at gmail.com>:
>>> That is a good point John, if anyone does a second look to map in
>>> missing buildings in a "completed" task square you should leave a comment
>>> on the task square that says you looked over the completed task square and
>>> filled in all the missing buildings you could find.
>>> For sure it is not a waste of time to review completed task squares, but
>>> I agree, it probably only needs one going over before validation.
>>> In addition, this is a very helpful way for new mappers to become better
>>> mappers and contribute to an urgent priority project to get done well and
>>> fast.
>>> Tiny task squares help, but stuff still gets missed and often we don't
>>> get the validation stage completed in time, no matter how important it is
>>> so an informal review makes a big difference if that is what a volunteer
>>> wants to do and can contribute.
>>> Cheers,
>>> Blake
>>> On 2/11/2016 2:33 PM, john whelan wrote:
>>>> I'm not sure this is the best use of our very limited number of
>>>> mappers.  Just scanning a tile takes time, so the optimum use of mapper
>>>> time is to have them scan once when they map and have a validator scan
>>>> once.
>>>> For a productivity point of view its better to have new mappers split
>>>> the tiles twice and map a tiny tile completely than have twenty of them
>>>> go over the same area.  From the same point of view its better to have
>>>> them map where we have good imagery than map where quote "You may have
>>>> to squint a bit".  Mapping whilst squinting takes more time to map the
>>>> same area than mapping where the imagery is good.  No matter where they
>>>> map it will be useful to someone if not a short term MSF or American Red
>>>> Cross project and to be honest if something like Ebola crops up having
>>>> fairly good mapping of existing highways and villages in place before
>>>> you start helps those projects in the field at least plan out what and
>>>> where.
>>>> Cheerio John
>>>> On 10 February 2016 at 10:28, Blake Girardot <bgirardot at gmail.com
>>>> <mailto:bgirardot at gmail.com>> wrote:
>>>>     Hi all,
>>>>     I just want to mention, that new mappers can really help with the
>>>>     validation process by doing what they typically do: Map in roads and
>>>>     buildings but into "Completed" task squares.
>>>>     You do not need to mark a task square "Validated", but just
>>>>     reviewing the completed squares and filling in missing things or
>>>>     fixing up buildings that might not be mapped very well (squaring up
>>>>     the rectangular buildings :) is immensely helpful.
>>>>     I wrote a short OSM Diary entry that says basically the same thing:
>>>>     http://www.openstreetmap.org/user/bgirardot/diary/36235
>>>>     I just thought I would mention it because if you see projects on the
>>>>     Tasking Manager that look "done" just know you can always help a bit
>>>>     more by reviewing "Completed" task squares just to double check
>>>>     nothing was missed even if you do not feel experienced enough to
>>>>     "Validate" a task square.
>>>>     This is especially true for projects where we have made a call for
>>>>     more mappers on the email list or via twitter. Double and triple
>>>>     checks to make sure the mapping in the instructions is actually
>>>>     complete really helps in the process and gets the people on the
>>>>     ground the best data we can possible generate for them.
>>>>     Cheers,
>>>>     Blake
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