GSI National Landslide Susceptibility Map

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Following two major landslide incidences in Ireland in 2003 in Galway and Mayo the Geological Survey Ireland established the Irish Landslides Working Group (ILWG) in 2004. It was felt important that it should be a multi-disciplinary team, bringing together various types of expertise which are relevant to landslide studies. This point is often stressed in the international literature on the subject (Brunsden, 1993). The Group includes expertise on geology (Bedrock and Quaternary), geomorphology, geotechnical engineering, planning, and GIS. The participants were drawn from state and semi-state agencies, and also the universities.

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Theme Science
Date dataset released 2012-01-11
Date dataset updated 2020-02-17
Dataset conforms to these standards The INSPIRE Directive or INSPIRE lays down a general framework for a Spatial Data Infrastructure (SDI) for the purposes of European Community environmental policies and policies or activities which may have an impact on the environment.
Rights notes ['Creative Commons Attribution 4.0 International (CC BY 4.0) licence', 'Data that is produced directly by the Geological Survey Ireland (GSI) is free for use under the conditions of Creative Commons Attribution 4.0 International license. https://creativecommons.org/licenses/by/4.0/legalcode\n\nUnder the CC-BY Licence, users must acknowledge the source of the Information in their product or application. \nPlease use this specific attribution statement: "Contains Irish Public Sector Data (Geological Survey) licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence".', 'license', 'Data that is produced directly by the Geological Survey Ireland (GSI) is free for use under the conditions of Creative Commons Attribution 4.0 International license. https://creativecommons.org/licenses/by/4.0/legalcode\n\nUnder the CC-BY Licence, users must acknowledge the source of the Information in their product or application. \nPlease use this specific attribution statement: "Contains Irish Public Sector Data (Geological Survey) licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence".', 'license']
Update frequency Other
Language English
Landing Page https://dcenr.maps.arcgis.com/apps/webappviewer/index.html?id=b68cf1e4a9044a5981f950e9b9c5625c
Geographic coverage in GeoJSON format {"type":"Polygon","coordinates":[[[-10.47472, 51.44555],[-10.47472, 55.37999], [-6.01306, 55.37999], [-6.01306, 51.44555], [-10.47472, 51.44555]]]}
Spatial Reference Systems (SRS) Irish Transverse Mercator (ITM, EPSG:2157)
Vertical Extent {"maxVerticalExtent": "1041", "verticalDomainName": "sea level", "minVerticalExtent": "0"}
Provenance information The Landslides in Ireland publication featured two case studies of landslide susceptibility mapping for the Mayo and Breifne areas. In 2013 the Geological Survey of Ireland (GSI) completed a landslide susceptibility mapping project as part of the National Geoscience Programme 2007 - 2013. This project was one of the main recommendations made in the 2006 publication “Landslides in Ireland”. Engineering consultants Mouchel Ireland Ltd. were commissioned to carry out the susceptibility mapping on behalf of GSI. Further detailed information on this project can be found here The susceptibility model produced as a result of this project is currently being assessed for counties Mayo and Kerry. Trinity College Dublin (Earth & Planetary Surface Processes) have been contracted to carry out further inventory development for these counties which will be integrated into the model. It is envisaged that this will indicate the stability of the susceptibility model on which to develop National susceptibility coverage by 2014. The maps included in this volume are “susceptibility” landslide maps as they provide information on areas which are predisposed to this type of geohazard. The data presented in these maps indicate, based on susceptibility banding or slope stability classification, areas ranging from a high susceptibility to landslide events to areas generally devoid of landslide events within two defined study areas. The susceptibility classification is based on a Unique Condition Unit (UCU) approach. A UCU is a parcel of terrain where a set of attributes are combined in a unique way. Taken alone they do not provide any indication of the susceptibility of landslides. However, if the number of landslides falling into a particular UCU can be been determined and then divided by the area of the relevant UCU this gives a landslide density value (landslides / km2) which is taken as a measure of susceptibility. Susceptibility Maps The susceptibility maps produced cover both study areas and are published at a scale of 1:50,000. A total of 34 map sheets cover the East Coast area and 7 map sheets cover the Cork area. The base data of the secondary data produced in the maps is a 20m DEM. All data input into the model is therefore brought to a resolution of 20m. In order to remove spurious data and to assign average cell values to the DEM for the creation of slope and TFI layers, some additional processing was carried out to the bare 20m DEM. For this reason the maps should only be used at a local level or the scale at which the maps are published and not for an individual site or property assessment of landslide susceptibility. The maps were produced partially based on field study data which was captured prior to and during the early - mid stages of the project. They therefore do not account for changes in development, infrastructure or topography that occurred after the date of the final field study data used (2011). The national DEM was prepared on the basis of 37 Hydrometric Areas within the Republic of Ireland, and their neighbouring coastal islands. The dataset was developed within the Environmental Protection Agency (EPA) Environmental RTDI project (2000-LS-2-M2) "Eutrophication from Agricultural Sources". The DEMs were interpolated from a variety of sources including 1:50,000 digital data from the Ordnance Survey Ireland (OSI) and are currently available as hydrologically corrected grid surfaces with 20m grid cell resolution, and based on the Irish National Grid Coordinate system. Detailed explanations of the methods of derivation, survey data used and model applied are provided in the relevant reports produced for the project under which the maps were prepared. Users of the maps should familiarise themselves fully with the content of these reports in advance of the use of these maps.
Period of time covered (begin) 2009-04-21
Period of time covered (end) 2013-03-11