On 09/10/19 22:42, Peter Neale via Talk-GB wrote:
... and if you had 2 devices, how would you know which is right? You
would need at least 3 devices, so that you could take a majority vote.
Actually 5 would better
6 is general taken as a minimum number to get a good student's T
And they
On 09/10/19 22:57, Simon Ritchie wrote:
> You'll need a GPS receiver with the capability of outputting carrier
phase data (u-blox receivers will do this) and ideally a
well-characterised external antenna (these are quite expensive).
That's very useful. Thanks. I am indeed using a uBlox
On 09/10/19 21:21, Martin Wynne wrote:
On 09/10/2019 11:11, Dave F via Talk-GB wrote:
Not so fast... The current Company is still bust. The shops are closed.
"Sunderland-based Hays said it planned to reopen all the shops under
its own brand with immediate effect."
"planed' "are to be"
On 09/10/19 22:03, Dave F via Talk-GB wrote:
2cm? I'm intrigued, what model are you using?
What were the atmospheric conditions on the day you took your reading?
I'd think to get that level of accuracy you 'd need readings over some
considerable time... days?
Otherwise you get bias from, as
I've had the occasional limited discussions on social media. Arguments
against using OSM fall into
1. Claim of no cost to use OS data as it's via local authority
licensing. Unsure if it's all LAs
2. They "wanted to use mapping that had 100% reliable data for the users
benefit."
3. Mild
On 10/10/2019 00:11, Warin wrote:
On 09/10/19 21:21, Martin Wynne wrote:
On 09/10/2019 11:11, Dave F via Talk-GB wrote:
Not so fast... The current Company is still bust. The shops are closed.
"Sunderland-based Hays said it planned to reopen all the shops under
its own brand with immediate
The advantage of turning them all to disused: is that they are done.
The disadvantage is that there is no local confirmation. However .. I
think most will agree that even without a local survey .. the shop is
closed.
Not so fast -- see:
https://www.bbc.co.uk/news/business-49985369
Martin.
On 09/10/2019 11:11, Dave F via Talk-GB wrote:
Not so fast... The current Company is still bust. The shops are closed.
"Sunderland-based Hays said it planned to reopen all the shops under its
own brand with immediate effect."
Martin.
___
Talk-GB
Are you using trig points that are also OS Net station locations?
https://www.ordnancesurvey.co.uk/legacy/docs/gps/OSNet_GPSWebSite_Coordinates_File.txt
I don’t believe many traditional trig stations were ever properly co-ordinated
to OS Net.
Cheers
Andy
From: Simon Ritchie
On Wed, 9 Oct 2019 at 11:40, Andy Robinson wrote:
> Are you using trig points that are also OS Net station locations?
> https://www.ordnancesurvey.co.uk/legacy/docs/gps/OSNet_GPSWebSite_Coordinates_File.txt
Pretty sure that all those OS Net locations are actually fixed GPS
receivers rather than
A few minutes done in Penrhyn Bay
https://www.openstreetmap.org/#map=18/53.31715/-3.76346
Cheers
Andy
From: Rob Nickerson [mailto:rob.j.nicker...@gmail.com]
Sent: 09 October 2019 06:43
To: Talk-GB
Subject: [Talk-GB] 24 hour mapathon - Aberconwy
Today is the day of the Aberconwy
On Wed, Oct 09, 2019 at 11:49:35AM +0100, Russ Garrett wrote:
> On Wed, 9 Oct 2019 at 11:40, Andy Robinson wrote:
> > Are you using trig points that are also OS Net station locations?
> > https://www.ordnancesurvey.co.uk/legacy/docs/gps/OSNet_GPSWebSite_Coordinates_File.txt
>
> Pretty sure that
Not so fast... The current Company is still bust. The shops are closed.
On 09/10/2019 11:00, Martin Wynne wrote:
The advantage of turning them all to disused: is that they are done.
The disadvantage is that there is no local confirmation. However .. I
think most will agree that even without a
I believe that the original data from the OS is completetrigarchive.zip.
Ian Harris created the trigpointing .uk website from that. The map
references for the three trig points I used are from that website, and yes,
you can walk up to those trig points and plonk your GPS device onto them.
The
2cm? I'm intrigued, what model are you using?
What were the atmospheric conditions on the day you took your reading?
DaveF
On 09/10/2019 11:05, Simon Ritchie wrote:
I've been working with some GPS equipment that claims to be accurate to
2cm. To test it, I've been visiting local OS trig
You are entering an extremely deep rabbit hole here and there are
hundreds of extremely nerdy aspects you have to consider when aiming
for sub-metre precision.
As you correctly point out, the position of trig points is no longer
accurate nor canonical. Errors of half a metre sound absolutely
On Wed, 9 Oct 2019 at 11:47, Gareth L wrote:
> Are you including the continental drift? That will make etrs89 gps coords be
> about 60-70cm off by now
That's the total net error since ETRS was established, but the ETRS
reference frame moves with the Eurasian plate and corrections are
issued, so
I've been working with some GPS equipment that claims to be accurate to
2cm. To test it, I've been visiting local OS trig points, taking position
measurements and checking if they are correct.
Unfortunately I've discovered that the data I'm getting from the OS is not
nearly as accurate as my
Are you including the continental drift? That will make etrs89 gps coords be
about 60-70cm off by now
On 9 Oct 2019, at 11:06, Simon Ritchie
mailto:simonritchie...@gmail.com>> wrote:
I've been working with some GPS equipment that claims to be accurate to 2cm.
To test it, I've been visiting
>From memory the bit of Penrhyn Bay close to the Little Orme is 60s or early
70s housing (Penrhyn Beach West etc), with a lot of semis with the first
floor rooms effectively in the roof space (a style I associate with Wimpey,
but other builders may have used it). Unfortunately, I last visited in
... and if you had 2 devices, how would you know which is right? You would need
at least 3 devices, so that you could take a majority vote.
Actually 5 would better
Or 7, or 9
Peter
Sent from Yahoo Mail on Android
On Wed, 9 Oct 2019 at 12:34, Simon Ritchie wrote:
> You're not going to find a (publically-accessible) physical location
which has better location error than 1m or so.
That was the kind of conclusion that I was coming to. There's the meridian
line at Greenwich, but that only gives one coordinate. It's a pity that
they don't have a crosshair
I went to check one which is a few hundred metres off my normal route to
the supermarket. For some reason I didn't take photos.
Apart from an A4 notice of closure (with few details) on the door, the
absence of staff, and unopened post on the floor, the shop looked as
normal. Deals still
On 09/10/2019 14:40, Simon Ritchie wrote:
They often leave objects in the ground to protect them, and then come
back a few years later to have another look using new techniques. It
would be nice if they knew precisely where their target is.
For that, you really need to record one or more
On Wed, 9 Oct 2019 at 12:57, Simon Ritchie wrote:
> However, that still leaves the fundamental problem: I can (and will)
> publish the kit of parts for making your own base station. You could use
> something similar to build a rover or you could buy one off the shelf.
> According to the
BTW if you have any details to add on the relevance of trig points to OSM
then please do add to
https://wiki.openstreetmap.org/wiki/Ordnance_Survey_triangulation_stations
On Wed, Oct 9, 2019 at 2:41 PM Simon Ritchie
wrote:
> The real question, really, is why you're aiming for that level of
> You'll need a GPS receiver with the capability of outputting carrier
phase data (u-blox receivers will do this) and ideally a well-characterised
external antenna (these are quite expensive).
That's very useful. Thanks. I am indeed using a uBlox device as my base
station. I ran it for 48
Heh, "...an A4 notice of closure (with few details) on the door, the
absence of staff, and unopened post on the floor,.." looks pretty
conclusive to me. I surveyed my local branch and found similar so have
changed it to disused.
I like the method of flipping shop, name, brand with a 'disused:'
The first Scottish Open Data Unconference takes place in Aberdeen on 14-15
March 2020. https://ti.to/code-the-city/SODU2020/
It would be good to see some OSM Alba-ns (is that the correct term?)
representing the map... David Noble? Chris Fleming?
I plan to make the trek northwards.
- Jez
On Wed, 9 Oct 2019 at 12:31, Simon Ritchie wrote:
> > You're not going to find a (publically-accessible) physical location which
> > has better location error than 1m or so.
> That was the kind of conclusion that I was coming to. There's the meridian
> line at Greenwich, but that only gives
I guess you could do that anyway. Most folks are only interested in relative
position and not whether one point on one side of the globe has the same
positional accuracy as a point on the opposite side. Surveyors have for
centuries been relying on a local arbitrary reference point and still do
>
> The real question, really, is why you're aiming for that level of precision
That's what the emerging equipment does. I'm just planning on showing how
it can be put together, but I'd like to be able to say with confidence that
it works properly.
As to who will use it, there's the readers of
Hi all
I'm meeting the local Sustrans office next week as they've asked me to
compile a 'map' of the NCN mileposts in my area (I think they really mean
an inventory with locator maps).
Obviously I'll be using OSM, and trying to get them to see the benefits of
doing the same. OSM seems to be
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