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.
- Dull adnabod
- Rhychwant
- Dosbarthiad
- Ansawdd
- Allweddeiriau
- System Cyfeirio Gofodol
- Cynnwys
- Cyfyngiadau
- Cynnal a chadw
- Metadata
Dull adnabod
- Dynodydd
- NRW_DS109814
- Teitl Amgen
-
- LAT-revised.TAB
- CCW derived Lowest Astronomical Tide (approximate LAT)
- Terfyn Isaf Arolwg Cam 1 Rhynglanwol Morol
- Laith Metadata
- English
- Datganiad
-
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.
- Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
- 2005-10-31
Rhychwant
Rhychwant
- Hyd
- Wales (WLS)
))
Maint Fertigol
- Maint allweddair MEDIN
- benthic boundary layer
Dosbarthiad
- Fformat - Math a Disgrifiad
-
-
Geographic Information System
()
- Math
-
MapInfo.TAB
-
Geographic Information System
()
Ansawdd
Ansawdd Data
- Cwmpas Ansawdd
- Dataset
- Datganiad
-
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.
Allweddeiriau
Allweddair
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2008-06-01
Allweddair
- NRW Thesaurus
-
- 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
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2023-12-31
Allweddair
- Math
- Theme
Dyfyniad
- Dyddiad (Adolygu)
- 2021-01-06
System Cyfeirio Gofodol
Cynnwys
Gwybodaeth Cynnwys
Proffil CNC
Elfennau CNC
Cyfyngiadau
Cyfyngiadau
Cyfyngiadau ar Fynediad a Defnydd Cyhoeddus
- Math o Gyfyngiad
- Other restrictions
Cyfarwyddeb Cyfyngiadau Mynediad
- Cyfyngiadau
- no limitations
Testun cyfyngiadau mynediad
- Cyfyngiadau eraill
-
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.
Defnyddiwch gyfyngiadau
- Cyfyngiadau Defnyddio
- Other restrictions
- Cyfyngiadau eraill
-
© 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.
Datganiad Priodoli
- Cyfyngiadau eraill
-
NRW Conditional
Metadata
Metadata
- Dynodydd Ffeil
- 4f4c4942-4343-5764-6473-313039383134 XML
- Laith Metadata
- English
- Math o adnodd
- Dataset
- Dyddiad Metadata
- 2024-12-09T12:42:12.339Z
- Enw Safonol Metadata
- NRW
- Fersiwn Metadata
-
1.0