If you think that the data must be 100% accurate you will have a blank
map ... therebe dragons.
The world standard for 1 kilogram mass is an artefact (a physical
object) in Paris.
You might think that it is 100% accurate and you'd be wrong. The
surface corrodes, gets dust on it .. that adds weight .. so you polish
it .. how much do you polish it? Too much and you remove weight, not
enough and you leave weight behind.
Everything has some level of uncertainty.
The JOSM way simplifier is set for a maximum displacement of 3 meters.
Is that acceptable?
Remember that the original data has some level of uncertainty too.
Typically a GPS would be 10 meters. Average a few and you might get down
to 5 meters.
Personally I'd rather have an indication that something is there even
if 'inaccurate' ... compared to a blank bit of paper.
On 26-Nov-16 09:18 AM, Dave F wrote:
Good.
Bearing in mind that nothing* in OSM is 100% accurate (& the Somerset
Levels do exist), how accurate do you need the data to be for them to
be good enough for inclusion?
* No, honestly, it's not.
DaveF
On 25/11/2016 15:12, Jason Woollacott wrote:
in the description i remember it stated it was based on the 10ft and
25ft contours.
------------------------------------------------------------------------
*From:* Dave F <davefoxfa...@btinternet.com>
*Sent:* 25 November 2016 14:07
*To:* Jason Woollacott; talk-gb@openstreetmap.org
*Subject:* Re: [Talk-GB] Somerset Levels
Not 100% sure, but wasn't it based on contour levels?
On 24/11/2016 17:35, Jason Woollacott wrote:
HI,
Yes, I removed this as I felt that it was incorrect and did not
reflect the conditions on the ground. It was specifically
removed under one change back in September 2016, whilst I was
working on addressing some of the other mapping errors around that
area. The Change was deliberately done under one change set, so
that it should be easily restored if there was ever a need for it.
However the boundary was a guestimate at best and did not reflect
the actual area of the Somerset Levels, (going through Bridgwater &
Weston Super Mare).
An example of what is really defined as the Somerset Levels is here
http://www.bbc.co.uk/news/uk-england-somerset-26080597 but there
isn't an extract, that I've found, that we could use for tracing.
I'm not sure what benefit reinstating this change would give.
Jason (UniEagle)
------------------------------------------------------------------------
*From:* Dave F <davefoxfa...@btinternet.com>
*Sent:* 23 November 2016 12:55
*To:* talk-gb@openstreetmap.org
*Subject:* Re: [Talk-GB] Somerset Levels
It appears it was deleted by user UniEagle
http://www.openstreetmap.org/changeset/42348215
You may wish to contact him & ask to participate in this discussion.
FYI
Undeleting using Potlatch 1
If you know a location where the boundary was, zoom in as close as
possible, then amend the URL & open in P1. This is an example near
Bridgwater:
https://www.openstreetmap.org/edit?editor=potlatch&#map=16/51.1414/-2.9724
Hit the 'U' (for undelete)
Then wait... & wait some more.
Eventually some red lines should appear (the server can be
temperamental
& refuse to play)
Select the way of the relation.
In the preset list at the bottom of the screen there should be a red
box
with 'Click to Unlocked' written in it.
Click to unlock (again, this may take some time)
Save & close.
Open your preferred editor to check it was properly undeleted.
DaveF
On 23/11/2016 00:45, Nick Austin wrote:
> Does anyone know what happened to the Somerset Levels super-relation?
>
> I don't know how to search for deleted stuff so I can't look up it's
> history to see what happened.
>
> TIA.
> Nick.
>
> _______________________________________________
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> Talk-GB@openstreetmap.org
> https://lists.openstreetmap.org/listinfo/talk-gb
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