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bgcolor="#FFFFFF" text="#000000"><div style="font-size:
12pt;font-family: Verdana;">It's a difficult call. I do a fair amount
of armchair mapping and in general I use the lowest classification of
highways that looks reasonable when I add a highway,if it should be
higher then I leave the change to the locals. In general I do not
delete or change tagging except when buildings have been duplicated when
I'll delete the duplicates if I'm feeling nice.<br><br>Having said that
when I see two small villages joined by what looks like an unconnected 2
km narrow dirt highway tagged as a motorway or primary highway I will
change the tag to unclassified.<br><br>Many of the problems come down to
training. HOT has some very reasonable training guides.<br><br>At the
end of the day the company commissioning the work want accurate maps so
the goals are the same. I'd suggest a team approach, simpler tasks are
given to new mappers, more complex tasks such as changing tags or
guessing if two highways are connected be given to ones with more
experience.<br><br>Occasionally I'll see something that looks odd. If
it was done three years ago by someone who hasn't mapped in three years
and only made four edits I'll probably correct it. If it was made by an
active mapper with a few thousand changesets to their name we'll have a
discussion. If it was mapped by Fredrick Ramm I might even leave it
untouched.<br><br>If it says "I love Elsie" with a heart shape I have
been known to delete it without reference to the mapper.<br><br>Cheerio
John<br><br><span>Mishari Muqbil wrote on 2019-01-07 9:23 AM:</span><br><blockquote
type="cite"
cite="mid:CAMEkuv9aWYcuhwhj6mVWksKvFgvqYH3FSCgi-HwQRV7-MD1ffA@mail.gmail.com"><div
dir="ltr"><div dir="auto"><div dir="ltr"><div><div dir="auto"><div
dir="ltr"><div dir="auto"><div dir="ltr"><div dir="ltr"><div><div>Hi
Everyone,</div><div><br></div><div>Some people from the Thai mapping
community are meeting Ajay, the mapping lead from Grab to discuss the
quality issues we've been having with their mappers but before we do
this I wanted input from the wider community. For those who are unaware,
Grab has commissioned another entity, Global Logic, to do the edits.<br></div><div><br></div><div>I've
made some example of quality issues here: <a
href="https://wiki.openstreetmap.org/wiki/Grab/Issues" rel="noreferrer
noreferrer noreferrer" target="_blank" moz-do-not-send="true">https://wiki.openstreetmap.org/wiki/Grab/Issues</a> I
think I need more help to categorize the problems and propose remedies
for them especially in the context of directed mapping teams. There were
also more issues documented in this thread <a
href="https://forum.openstreetmap.org/viewtopic.php?id=6407"
rel="noreferrer noreferrer noreferrer" target="_blank"
moz-do-not-send="true">https://forum.openstreetmap.org/viewtopic.php?id=6407</a>
but I haven't sorted through all of them. This process would at least
take the focus away from individual problems and allow us to come up
with a strategy for dealing with classes of problem instead.<br></div><div><br></div><div>From
what I can tell, these are the broad classes of issues:</div><div>1.
Connecting roads where no connection exists - ie. making guesses where
there are buildings or tree covers blocking satellite imagery.<br></div><div>2.
Incorrect Tagging - i.e. residential roads in areas marked as parks</div><div><span
style="font-family:sans-serif">3. Not using up to date satellite
imagery and overriding recent changes made by local mappers</span><br></div><div>4.
Changing existing tags - ie. secondary_link to primary etc. overriding
local mappers discretion.<br></div><div>5. Micro-alignment using
satellite imagery<br></div><div><br></div><div>What I would like help
with is this:<br></div><div><br></div><div>1. What's a fair expectation
from such a mapping team? On one hand there's the potential to add much
geometry to the project, on the other hand any bad data has an outsized
effect on utility and perceived quality. What's the sweet spot? Sadly
Bicycle routing in the Grab mapped areas in Bangkok using Brouter.de is
now unreliable because service roads have been added without
information about access permission or barrier and in other cases ways
have been connected where no connection exists.<br></div><div><br></div><div>2.
Thailand's mapping community is small and it would be impossible for us
to go through all 7,000 edits made and set it right. I've identified at
least one of the issues (1-3) in roughly 1 out of 4 changesets made by
Grab/Global Logic in my neighborhood in Central Bangkok and I would be
unable to give feedback on any issues outside of this zone, likely the
same with other mappers.</div><div>2.1 Should we just ignore the errors,
slowly fix the errors, or demand Grab fixes it somehow? Can we take
lessons from any other projects, say TIGER imports?<br></div><div>2.2
What would even constitute as a fix by Grab? Should we ask them to do
something like fixme=verify_on_ground on the new entries so that it can
be ignored by the routing until verified? At least it will make the map
usable again. Alternatively we identify the sweet spot in (1) and ask
Grab to redo their edits to comply.<br></div><div><br></div><div>3. It's
been difficult to agree with the mapping team on a standard. They did
make some statements in <a
href="https://forum.openstreetmap.org/viewtopic.php?pid=720203#p720203"
rel="noreferrer noreferrer noreferrer" target="_blank"
moz-do-not-send="true">this post</a> which seems to highlight a
difference of understanding between the community and the mapping team.</div><div>3.1
There doesn't seem to be a way in to enforce a commitment.
Hypothetically if they said "we do QC" then we continue to uncover
errors or “we don’t retag” when clearly this is happening, we can’t stop
them.</div><div>3.2 Maybe there needs to be a way of assessing mapping
activities so new organized mappers know what would qualify as a high
quality contribution.<br></div><div><br></div><div>4. The <a
href="https://wiki.osmfoundation.org/wiki/Directed_Editing_Policy"
moz-do-not-send="true">directed editing policy</a> page gives some good
guidance but I think some best practices are required, complete with
example workflow and KPIs. Maybe this can be related to scale, the
bigger the scale of edits the stricter the quality and the more
transparency required. There can also be a difference between mapped vs
unmapped areas. Has anyone published any such material for their own
mapping projects that we can propose to Grab?</div><div><br></div><div>5.
I brainstormed some ideas with varying levels of feasibility in case it
can be built upon by others:</div><ul><li>Local Grab mapping team
oversee remote work and are responsible for the remote mapper's edits. </li><li>Mappers
are put in small teams with team leaders being personally responsible
for quality.</li><li>Transparency about quality issues, affected
changesets, causes and remedies ie. everything on a public issue
tracker.</li><li>Global Logic brings experienced OSMers to their
production room</li><li>Global Logic makes their process open so that
the community can identify weaknesses and points of errors</li><li>Bounty:
Grab deducts US$5 from Global Logic's remuneration and gives it as ride
credit to local contributors who spot a bug. This would align
incentives :-)</li><li>Fork the map, copy it and make changes on their
own servers, allow the community to pull in whatever changes we want
into the main map.</li></ul></div></div></div></div></div></div></div><div><div
dir="auto"><div dir="ltr"><div dir="auto"><div dir="ltr"><div dir="ltr"><div
dir="ltr"><div>Thanks in advance.</div></div><div dir="ltr"><br></div><div
dir="ltr">Best regards<br><div><div dir="ltr"
class="m_-5911237269398198772m_8648432594156926571m_-4568797106315097347m_-7406155993592920543m_-458457239109952721m_-2198226317659155602m_7574646488197486171gmail_signature"><div
dir="ltr"><div><div>Mishari Muqbil<br></div></div></div></div></div></div></div></div></div>
</div></div>
</div>
</div></div>
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