On 12/12/2016 09:42, Stuart Reynolds wrote:
sand is shown all the way out to the end of the pier
A practical solution to tidal beach areas is to map them as two areas
with a common bound, that being the MHW nominal coastline. The areas
above MHW can optionally carry the tag "tidal=no", but th
<mailto:talk-gb@openstreetmap.org>
Subject: Re: [Talk-GB] GB Coastline - PGS vs OS
Colin
I was more talking about the actual shape of the MHW rather than its position;
if that makes sense.
some examples of problems in the Isle of Wight
1) There's a section here
http://www.openstr
to cover is the islet and rocks which are above sea
> level even at high water level. (See the Looe link again)
>
> Jason (Unieagle)
>
> -
>
> FROM: David Groom
> SENT: 12 December 2016 00:51
> TO: talk-gb@openstreetmap.org
> SUBJECT: Re: [T
(Unieagle)
From: David Groom
Sent: 12 December 2016 00:51
To: talk-gb@openstreetmap.org
Subject: Re: [Talk-GB] GB Coastline - PGS vs OS
Colin
I was more talking about the actual shape of the MHW rather than its position;
if that makes sense.
some examples of problems in the Isle o
4) More inaccuracies here
http://www.openstreetmap.org/#map=19/50.76650/-1.30029
David
-- Original Message --
From: "Colin Smale"
To: talk-gb@openstreetmap.org
Sent: 11/12/2016 22:17:44
Subject: Re: [Talk-GB] GB Coastline - PGS vs OS
Hi David,
Looking at the spot y
This discusses the accuracy of the MHW/MLW data
http://eprints.hrwallingford.co.uk/554/1/HRPP523_Error_analysis_of_Ordnance_Survey_map_tidelines.pdf
//colin
On 2016-12-11 23:17, Colin Smale wrote:
> Hi David,
>
> Looking at the spot you indicate on Bing imagery does indeed look like MHW
>
Hi David,
Looking at the spot you indicate on Bing imagery does indeed look like
MHW should be above the salt-marsh areas. Looking at Google[1] it is
however possible that the grass doesn't quite get submerged, even at the
highest tides, so it might also be possible that it is strictly correct.
I suspect that even though much of the coastline is tagged "source=PGS"
is has been amended by reference to Yahoo and after that Bing imagery,
but the subsequent editors did not remove the "source=PGS" tag.
Certainly comparing your gpx file for the Isle of Wight with the
coastline currently in
Hi,
Most of the coastline is currently tagged as "source=PGS". As part of
the Boundary-Line open data set OS provide MHW lines which look to be
significantly better than the PGS data:
* Much newer - updated twice a year, although I am not sure how old
the actual underlying survey data i
9 matches
Mail list logo
