Thanks for you feedback John and Blake,
I have tried to pull out some of the points raised here, for my
understanding and perhaps for others:
There are different standards of mapping and to some extent different
standards of validation needed, depending on the project.
In-country knowledge of the country can effect the quality of
mapping/validation.
A good mapper does not mean that their are a good validator, different
skill sets are needed.
The capacity to map/validate is also dependant to some degree on the the
quality of the video system and screen one is using.
There seems to be a difference of quality of mapping depending on the
software used: JOSM vs. iD. Is this an issue to be addressed?
Was it suggested that coaching is a good way for people to become good
validators?
Certain projects could do with a certified validator but naturally to
have a "badge" is not for everybody.
A link to validating guidelines
http://wiki.openstreetmap.org/wiki/OSM_Tasking_Manager/Validating_data
Please say if I missed and misrepresented your points.
Regards,
Graham
On 5/4/2016 21:49, john whelan wrote:
I think the point was that that there are different standards of
mapping and to some extent validation as well. In Nepal we had time
and resource constraints and I must confess I took some short cuts and
didn't do a through a job as could have been done. Sometimes it's a
judgement call and I think as you and I have discussed sometimes some
validators do an excellent job but check rather more than either of us
would when validating.
I've even heard a whisper of a validator taking one look at someone's
work and zapping it and just remapping as it was quicker but of course
that never happens in OSM and would never be documented.
Cheerio John
On 5 April 2016 at 09:36, Blake Girardot <bgirar...@gmail.com
<mailto:bgirar...@gmail.com>> wrote:
On 4/5/2016 3:15 PM, john whelan wrote:
Blake thought my methods of validation in Nepal left much to be
desired.
That sounds a little strong :) I forget the question I had or the
comment, but after talking with you I was good with it and agreed
is all I remember.
>I agreed but given that 70% of the mappers were new even the
basic validation I did improved the data quality quickly.
This I 100% agree with.
Cheers,
Blake
I also had a
couple of mappers who were visually checking tiles and finding
30% more
buildings sometimes. Which comes back to the quality of the video
system and screen you’re using. “Why does your laptop show
the image in
JOSM better than mine in iD?” The lap top I was using was an
old Dell
professional grade one and my desktop screen at home shows an even
clearer image. So the equipment the validator has available
might be an
important factor on the quality of the validation.
To me validation is a form of coaching being good at something
doesn’t
mean you make a good coach. To me Maperthons are a source of
a dozen
new mappers and really questionable data. The faster we can
get in and
give feedback the better. When you need to add 50 settlements
to a tile
it takes resources and to do this I’ve used sensible mappers
with a
month’s experience and delegated. If its just
highway=unclassified and
landuse=residential that’s fine. I’ve also seen mappers with
a thousand
edits to their name who don’t make good validators, the
project asks for
settlements and connecting highways, they like to map all the
tracks as
well. I’ve seen tiles invalidated for missing things that
were not
requested in the project instructions.
It also needs tact, a European mapper who has been mapping
locally will
almost certainly use the wrong tags in Africa for highways.
They’re
high quality mappers of the type Africa needs but invalidating
the tile
because the tags are wrong may not help with the retention rates.
http://wiki.openstreetmap.org/wiki/OSM_Tasking_Manager/Validating_data
is a start, I’m not certain I agree with every statement but
it’s a good
start.
There is a problem with iD mappers they tend to have more
crossing ways
and highways that almost meet than others. Probably because
there is no
easy way to check for these in iD. So whilst I would comment JOSM
validation detected six crossing ways normally, if I know
they’re an iD
editor I just correct and don’t comment.
If it’s a more complex project, map and tag everything in
sight I don’t
even bother validating these days. I’ll let someone else with
more
experience than I go and do it. I only have 8,000+ edits to
my name.
These projects certainly could do with a certified validator
and to be
honest I have no interest in getting a badge.
Cheerio John
On 5 April 2016 at 05:37, graham <gra...@klunky.co.uk
<mailto:gra...@klunky.co.uk>
<mailto:gra...@klunky.co.uk <mailto:gra...@klunky.co.uk>>> wrote:
Dear Hi,____
__ __
With the subject of validators in that last few emails,
and past emails thread discussing how to know when some one
can start validating or not. How much experience does one
need? One may think that they are good, but other may not etc..
____
__ __
So, I thought to just suggest an idea. I am not sure what
people might think about it, maybe it has already been
discussed before.
Maybe the issue has been solved already.____
__ __
The idea:____
I think that maybe if there was a process to become
officially recognised as an"Validator", then it would be a
"position" worth achieving, it would make it a challenge. For
now, I do not think that there is any solid pre-requisite to
be a validator?____
__ __
Below I am suggesting a potential avenue to become an
official validator:____
__ __
1) To complete a minimum number of tiles, as proof of
commitment to HOT and direct experience with HOT mapping
(regardless of one's professional career), then 2) to take a
short test of proficiency.____
__ __
Details:____
1) Can members the HOT team determine the number of tiles
each user has completed? I know that more that one user can
complete one tile, but perhaps if one user completes a high
percentage of a tile (of all the points, line, and polygons),
that would be considered a "complete tile" for this purpose.
As for another users then reworking the tile, this is another
discussion point.____
__ __
2)The test might be to review a number of tiles from
previous projects and they need to comment on the quality of
the digitalisation and complete any reworking that is needed.
A minimum number of tiles need to be correct, (to a certain
standard), in order to pass the test. In each test, a random
subset of tiles for a complete selection of tiles could be
used, so that not cheating could occur.____
__ __
__ __
Additionally, these official validators could have a
symbol next to their users names. This way, when a mapper asks
for advise regarding their mapping, the mapper would know if a
"validator" is responding or not.____
__ __
Just an idea...____
__ __
Regards,____
__ __
Graham____
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