4f4c4942-4343-5764-6473-313039383134 English Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en 2024-12-09T12:42:12.339Z NRW 1.0 wel British National Grid (EPSG::27700) Lower Limit of Marine Intertidal Phase 1 Survey Lower Limit of Marine Intertidal Phase 1 Survey LAT-revised.TAB CCW derived Lowest Astronomical Tide (approximate LAT) Terfyn Isaf Arolwg Cam 1 Rhynglanwol Morol 2005-10-31 NRW_DS109814 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. 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. Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Countryside Council for Wales (CCW) Countryside Council for Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW enquiries@naturalresourceswales.gov.uk http://naturalresourceswales.gov.uk/splash?orig=/ Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Hydrography GEMET - INSPIRE themes, version 1.0 GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme 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 NRW Thesaurus NRW Thesaurus 2023-12-31 geonetwork.thesaurus.local.theme.converted_nrw-keywords Sea level SeaDataNet Parameter Discovery Vocabulary SeaDataNet Parameter Discovery Vocabulary 2021-01-06 geonetwork.thesaurus.external.theme.rdf+xml 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. no limitations © 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. NRW Conditional Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. Contains Ordnance Survey Data. Ordnance Survey Licence number AC0000849444. Crown Copyright and Database Right. English boundaries oceans biota SeaVoX Vertical Co-ordinate Coverages SeaVoX Vertical Co-ordinate Coverages 2021-01-06 benthic boundary layer Wales (WLS) -5.777741 -2.608865 51.240829 53.513067 1996-04-01 2005-10-31 Geographic Information System MapInfo.TAB Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 false 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. 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.