> While realigning the coastline is possible, they will be surveying for a
decade or so just to figure out everything that moved.
No, not a decade.
While it will take some amount of time for changes to propagate to
cartographic products according to their update cycle, the 'figuring out
what move
It was over 5 meters in some places along the coast, but only a very small
part. Under the ocean, it was 25m.
Most of japan stayed put, but the northern section along the coast was
stretched a bit wider, but the coast sank about 1m, so with coastal flooding,
japan didn't get that much bigger.
According to
http://www.dw.de/quake-shifted-japan-by-over-two-meters/a-14909967 it was
2,4 m.
2014-12-30 22:22 GMT+01:00 Rainer Fügenstein :
>
> W> Ultimate 'accuracy'? You do realise that the tectonic plates are moving?
>
> btw: as a result of the Mar.2011 earthquake, japan has moved by at
> lea
2014-12-24 0:21 GMT+01:00 Friedrich Volkmann :
> I used estimated_accuracy=* or gps_accuracy=* a couple of times, but I
> doubt
> that it prevents other mappers from moving or even deleting them. Some use
> editors like Potlatch, so they are not aware of tags. Some do thousands of
> edits, all of
W> Ultimate 'accuracy'? You do realise that the tectonic plates are moving?
btw: as a result of the Mar.2011 earthquake, japan has moved by at
least 5m. how did OSM react?
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ng-requ...@openstreetmap.org wrote:
>
> Date: Mon, 29 Dec 2014 15:27:23 +0100
> From: Kotya Karapetyan
> To: Rainer Fügenstein , "Tag discussion,
> strategy and
> related tools"
> Subject: Re: [Tagging] Accuracy of survey
> Message-ID:
>
>
On 30/12/2014 6:41 AM, tagging-requ...@openstreetmap.org wrote:
Date: Mon, 29 Dec 2014 15:27:23 +0100
From: Kotya Karapetyan
To: Rainer Fügenstein , "Tag discussion, strategy and
related tools"
Subject: Re: [Tagging] Accuracy of survey
Message-ID:
Content-Type:
Kotya Karapetyan wrote on 2014-12-29 15:27:
Just recently I discovered that something in this direction already exists:
https://wiki.openstreetmap.org/wiki/WikiProject_France/Rep%C3%A8res_G%C3%A9od%C3%A9siques#Permanence_des_rep.C3.A8res
Example: https://www.openstreetmap.org/edit#map=23/43.4227
Happy holidays and 2015 everyone!
> what is needed here is some tag, saying "don't touch these
> coordinates, they've been surveyed with high(est) accuracy".
I second this idea.
Just recently I discovered that something in this direction already exists:
https://wiki.openstreetmap.org/wiki/WikiPr
On 2014-12-23 20:01, christian.pietz...@googlemail.com wrote :
> the problem with nodes is, that they are easily overssen.
> It would be nice to have the possibility to show a warning when moving
> an opject with high accuracy. The best examples are GPS reference
> points like this: https://www.ope
TP> It was not clear if the OP indeed wants to map pipelines,
TP> or was just quoting the pipeline expert for his opinion about
TP> surveying methods.
the latter. I'm referring to all nodes, not just pipelines & marker.
Just used the conversation I had some time ago as an example.
W> Terms !!
W>
the problem with nodes is, that they are easily overssen.
It would be nice to have the possibility to show a warning when moving an
opject with high accuracy. The best examples are GPS reference points like
this: https://www.openstreetmap.org/node/2977364293
Since they have fixed coordinates it wou
Friedrich Volkmann wrote on 2014-12-23 23:59:
There are no GPS traces for pipeline markes. There are traces for roads and
paths only.
It was not clear if the OP indeed wants to map pipelines,
or was just quoting the pipeline expert for his opinion about
surveying methods. And if you walk/drive
Oops, I forgot to finish a phrase...
I just checked a place where I had spotted a Bing offset before
and that disappeared. National aerial photos 2009 and 2012 are
offset by 2.8m. Bing is almost in the middle. But that's because
of a perspective effect. The natio
Accuracy is indeed a problem.
An early OSM update I made was moving a borderline by 250m and put
a devotion site from an arrondissement to another.
Since then many corrections of more that 5 m, mainly due to user
being unaware of Bing's offset (at close zoom of co
On 2014-12-23 21:39, Rainer wrote :
MK> maybe just add a note to the pipeline (note = "maped mit GPS with
MK> guaranteed accuracy of ").
I'm rather thinking of something machine-readable, enabling the editor
to warn the user in case he/she is about to change high pr
On 24/12/2014 11:29 AM, tagging-requ...@openstreetmap.org wrote:
Date: Tue, 23 Dec 2014 17:37:34 +0100
From: Rainer Fügenstein
To: "Tag discussion, strategy and related tools"
Subject: [Tagging] Accuracy of survey
Message-ID: <811143140.20141223173...@oudeis.org>
Co
On 23.12.2014 17:37, Rainer Fügenstein wrote:
> mapper A, by means of DGPS, MilStd GPS, crystal ball etc., is able to
> achieve an accuracy of, say, a few centimeters and uses it to add new
> nodes (POIs) to OSM.
>
> some time later, mapper B with his/her ancestors mechanical GPS device
> (*), ach
On 23.12.2014 17:57, Tom Pfeifer wrote:
> I would consider that a non-issue as you said, for those reasons:
>
> - When it comes to GPS traces on objects that don't move (*), the
> beauty of crowdsourcing is on our side. The collection of
> traces over a longer time creates a cloud of traces wh
On 23.12.2014 21:39, Rainer Fügenstein wrote:
> I'm rather thinking of something machine-readable, enabling the editor
> to warn the user in case he/she is about to change high precision
> data.
There are quite a couple of editors. Most certainly, some of them will not
implement the feature.
Also
MK> maybe just add a note to the pipeline (note = "maped mit GPS with
MK> guaranteed accuracy of ").
I'm rather thinking of something machine-readable, enabling the editor
to warn the user in case he/she is about to change high precision
data.
___
Tag
Am 23.12.2014 um 17:37 schrieb Rainer Fügenstein:
what is needed here is some tag, saying "don't touch these
coordinates, they've been surveyed with high(est) accuracy".
maybe just add a note to the pipeline (note = "maped mit GPS with
guaranteed accuracy of ").
Cheers,
Michael.
___
On 23/12/2014 16:57, Tom Pfeifer wrote:
The collection of
traces over a longer time creates a cloud of traces which
form a Gaussian bell curve, in density, over the ground truth.
Except that the position of a node in the DB is the last edited value,
not the mean position of all historica
I would consider that a non-issue as you said, for those reasons:
- When it comes to GPS traces on objects that don't move (*), the
beauty of crowdsourcing is on our side. The collection of
traces over a longer time creates a cloud of traces which
form a Gaussian bell curve, in density, ove
while we are at it, imagine the following situation:
mapper A, by means of DGPS, MilStd GPS, crystal ball etc., is able to
achieve an accuracy of, say, a few centimeters and uses it to add new
nodes (POIs) to OSM.
some time later, mapper B with his/her ancestors mechanical GPS device
(*), achiev
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