Lower Limit of Marine Intertidal Phase 1 Survey
This is a GIS dataset line dataset depicting an approximation of the Lowest Astronomical Tide, through digitising along a combination of the OS 1:50,000 intertidal boundary and the lowest survey points of the Countryside Council for Wales (CCW) marine intertidal phase 1 mapping survey. The purpose of this data capture was to define the lowest boundary of the intertidal zone, which has relevance when defining Site of Special Scientific Interest (SSSI) boundaries for intertidal features. All SSSI's designated after the CCW Phase 1 mapping survey use this as their lowest limit.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS109814
- Alternative Title
-
- LAT-revised.TAB
- CCW derived Lowest Astronomical Tide (approximate LAT)
- Terfyn Isaf Arolwg Cam 1 Rhynglanwol Morol
- Metadata Language
- English
- Lineage
-
Derived from the OS MasterMap intertidal lowest boundary and the CCW marine intertidal Phase 1 mapping survey. The CCW survey provides information on communities within the intertidal zone as a seamless layer. The lowest boundary of the survey, completed during spring tides, approximates to the lowest astronomic tide in most cases, although other factors influence the tide heights such as freshwater input in estuaries and storm surge. The intertidal habitat mapping began in 1996 and was completed in 2005. All work has been undertaken by CCW's in house intertidal survey team. Production of the Lowest Astronomical Tide (LAT) dataset was completed by CCW cartographic unit. The combination of OS features (dated pre year 2001) and CCW mapped features (between 1996 and 2005) does not give an actual boundary, but an indication of some of the possibilities of where the boundary may lie. In dynamic locations, such as estuaries and sedimentary embayments, changing sandbanks and channels makes for an unrealistic LAT. The lowest boundary of the CCW survey, completed during spring tides, approximates to the lowest astronomical tide in most cases, although other factores influence the tide height such as freshwater input in estuaries and storm surge.
- Dataset Reference Date (Publication)
- 2005-10-31
Extent
Extent
- Geographic Extent
- Wales (WLS)
))
Vertical Extent
- Medin Extent Keyword
- benthic boundary layer
Distribution
- Format Type and Description
-
-
Geographic Information System
()
- Specification
-
MapInfo.TAB
-
Geographic Information System
()
Quality
Data quality
- Quality Scope
- Dataset
- Lineage
-
Derived from the OS MasterMap intertidal lowest boundary and the CCW marine intertidal Phase 1 mapping survey. The CCW survey provides information on communities within the intertidal zone as a seamless layer. The lowest boundary of the survey, completed during spring tides, approximates to the lowest astronomic tide in most cases, although other factors influence the tide heights such as freshwater input in estuaries and storm surge. The intertidal habitat mapping began in 1996 and was completed in 2005. All work has been undertaken by CCW's in house intertidal survey team. Production of the Lowest Astronomical Tide (LAT) dataset was completed by CCW cartographic unit. The combination of OS features (dated pre year 2001) and CCW mapped features (between 1996 and 2005) does not give an actual boundary, but an indication of some of the possibilities of where the boundary may lie. In dynamic locations, such as estuaries and sedimentary embayments, changing sandbanks and channels makes for an unrealistic LAT. The lowest boundary of the CCW survey, completed during spring tides, approximates to the lowest astronomical tide in most cases, although other factores influence the tide height such as freshwater input in estuaries and storm surge.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
- NRW Thesaurus
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- marine biology (subtidal biology) (littoral biology) (sublittoral biology)(intertidal biology)(see also seashore)
- geographical information systems (GIS)
- mapping (map drawing) (cartography)(see also digital mapping)
- Lowest Astronomical Tide
- Type
- Theme
Citation
- Date (Publication)
- 2023-12-31
Keywords
- Type
- Theme
Citation
- Date (Revision)
- 2021-01-06
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
Constraints
Constraints
Limitations on Public Access and Use
- Restriction type
- Other restrictions
Access Constraints Directive
- Limitations
- no limitations
Access Constraints Text
- Other constraints
-
The following data is considered OS derived data and is therefore jointly owned by NRW and the Ordnance Survey. There are no access restrictions on this data. However there are third party use restrictions.
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
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© CNC/NRW and © Crown copyright. All rights reserved. Natural Resources Wales, AC0000849444 Data may be re-used under provision and in line with the terms of a NRW licence. Those seeking commercial re-use require a commercial licence available from the OS.
Attribution Statement
- Other constraints
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NRW Conditional
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313039383134 XML
- Metadata Language
- English
- Resource type
- Dataset
- Metadata Date
- 2024-12-09T12:42:12.339Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
-
1.0