Boundary High Water Mark

• Published by: Ordnance Survey
• Last updated: 02 October 2023
• Topic: Not added
• Licence: Other Licence ; View licence information

Summary

In the OS NGD Boundaries Collection, the mean high water (springs) mark is shown to the normal tidal limit (NTL). Areas of salt marsh, mudflats and so on often have extremely complicated tide lines. For ease of digitising and to reduce data volumes, mean high water may be generalised in these areas (not Scotland). The mean high water (springs) mark is represented in the OS NGD Boundaries Collection by a polyline feature. The mean high water (springs) mark is subject to continuous change, but the captured alignment of a tide line is a snapshot on one day. It is not practical to revise tide lines frequently.

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Data links

Link to the data	Format	File added	Data preview
Product description	N/A	02 October 2023	Not available
OS DataHub	N/A	02 October 2023	Not available

Additional information

View additional metadata

• Added to data.gov.uk: 2023-10-02T14:14:28
• Access contraints: NGD data is available via OS Partners and to PSGA members
• Harvest GUID: EAID_18079BE0_6F4A_44ea_B0C2_7B714AF9FF9F
• Extent: Latitude: 60.85° to 49.90°
• Extent: Longitude: -8.66° to 1.79°
• Dataset reference date: 2022-09-29 (publication)
• Frequency of update: daily
• Responsible party: Ordnance Survey (publisher)
• ISO 19139 resource type: dataset
• Metadata language: eng
• Source Metadata: XML
• Source Metadata: HTML

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