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Bugs

Unpleasant artefact in Bristol Channel - Boundary-Line

[Deleted User]
  • Deleted user
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    • 27 February 2014 06:53PM
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    • Registered: 30 April 2008 11:24AM
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    Hi,

    There's a rather nasty looking artefact in the middle of the Bristol Channel in several .shp files in the Boundary Line data. e.g. district_borough_unitary_region.shp

    Here's a link to a screenshot from QGIS:
    http://geep999.blogspot.co.uk/2014/02/artefact-in-bristol-channel.html

    Cheers,
    Peter

    6 responses

    [Deleted User]
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      • 28 February 2014 09:58AM
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      • Registered: 17 November 2010 05:13PM
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      That will be because of Flat Holm and Steep Holm islands in the Bristol channel.

      [Deleted User]
      • Deleted user
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        • 28 February 2014 10:02AM
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        Saying that, I have wondered several times how they end up belonging to the Bristol City Council area. Having just looked at Wikipedia, it suggests one is part of Wales and belongs to Cardiff and the other comes under North Somerset...

        [Deleted User]
        • Deleted user
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          • 28 February 2014 12:46PM
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          I realise that the islands may belong to Bristol, or wherever, but surely that's no reason to have those nasty straight lines down the middle of the Bristol Channel. The Scottish islands don't have such artefacts that I've noticed.

          Cheers,
          Peter

          OS OpenSpace TeamOS OpenSpace Team
            • 4 March 2014 09:56AM
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            Hi geep999,

            This is a known ‘leg’ in the Bristol Channel to reflect the official seaward extension made by an Act of Parliament as stated on page 22 of the user guide.

            Kind regards,

            OS OpenSpace Team

            [Deleted User]
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            • Rating: 33 points Advanced
              • 4 March 2014 10:21PM
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              Aah...
              Thanks!
              Must break that bad habit of not reading user guides through to the bitter end.

              Cheers,
              Peter

              nhopton
                • 11 September 2018 06:25PM
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                • Registered: 11 September 2018 05:54PM
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                I use the Historic Counties data contained in the Boundary Line dataset. In this set the seaward extension mentioned above is also present but shown as being a part of Gloucestershire. I have actually read the guide, which mentions an act of Parliament, but with no date. Can I take it that the sea area in question was indeed a part of the historic county of Gloucestershire? It looks most odd on the maps I'm making.

                Best regards,
                Nick.





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