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Quaternary Sediments 1:50,000 Ireland (ROI) ITM

Category: Environment
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In terms of time scale in geology, Quaternary is the present-day time and it began 2.6 million years ago. A lot of this time period relates to the Ice Age. Quaternary sediments are the soft material that has been deposited during this time. In Ireland much of this is related to the movement of glaciers and ice sheets. The main types of sediments shown on the map are tills (boulder clays), gravels, sands and peat. Over most parts of Ireland, these sediments cover the bedrock (solid rock at or below the land surface). Geologists map and record information from the shallow sediments which can be seen at or near the surface. This information along with boreholes (a deep narrow round hole drilled in the ground), geophysical data (information on the physical properties of the Earth's surface and subsurface e.g. magnetics, gravity and electromagnetics) and geochemical data (chemical properties) is used to create the map. Areas are drawn on a map to show where sediments are found. We collect new data to update our map and use data made available from other sources. This map is to the scale 1:50,000 (1cm on the map relates to a distance of 500m). It is a vector dataset. Vector data portray the world using points, lines, and polygons (areas). The sediments data is shown as polygons. Each polygon holds information on the sediment type, sediment code and its unique identifier.

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Theme Environment
Date released 2013-11-21
Date updated 2021-10-18
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)', '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.\n\nhttps://creativecommons.org/licenses/by/4.0/\n\nhttps://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.\n\nPlease use this specific attribution statement: "Contains Irish Public Sector Data (Geological Survey Ireland) licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence".\n\nIn cases where it is not practical to use the statement users may include a URI or hyperlink to a resource that contains the required attribution statement.', 'license']
Update frequency Other
Language English
Landing page https://dcenr.maps.arcgis.com/apps/webappviewer/index.html?id=de7012a99d2748ea9106e7ee1b6ab8d5&scale=0
Geographic coverage in GeoJSON format {"type":"Polygon","coordinates":[[[-11.0, 50.0],[-11.0, 56.0], [-5.0, 56.0], [-5.0, 50.0], [-11.0, 50.0]]]}
Spatial Reference Systems (SRS) Irish Transverse Mercator (ITM, EPSG:2157)
Vertical Extent {"verticalDomainName": "sea level", "minVerticalExtent": "0", "maxVerticalExtent": "1041"}
Provenance information Geologists map and record information from the shallow sediments which can be seen at or near the surface. This information along with boreholes (a deep narrow round hole drilled in the ground) and geophysics is used to create the map. Areas are drawn on a map to show where materials are found. Originally, the Quaternary sediments map for various parts of Ireland were hand drawn on paper maps. Phase 1: The paper maps were digitised. Each map was manually digitised using AutoCAD software. The data was clipped to the OSi coastline (high water mark). Water bodies such as lakes were also clipped. Irish National Grid (IG) projection. Phase 2: Data was converted to shapefiles IG AutoCAD layers were converted from .dxf format to shapefiles. New data was compiled, interpreted and added to these data to produce a map covering Ireland (2013) A stylefile was generated. A legend was generated. Shapefiles produced were: QuaternarySediments.shp - A polygon shapefile that contains Quaternary geological information on deposit type. Phase 3: Quaternary sediments 1:50,000 Map, 2013 to present, ITM Quaternary Sediments Map re-projected in ArcGIS from Irish National Grid (IG) to Irish transverse Mercator (ITM) projection. New data is compiled and interpreted from the following sources: field observation data, Tellus geophysics data (magnetic, electromagnetic, radiometric data), Tellus geochemistry data, borehole data and groundwater data. When this information changes the distribution of the areas of Quaternary deposit, we update this 1:50,000 map with the changes. New data has been added into this dataset from parts of Cavan, Galway, Leitrim, Longford Monaghan, Sligo, Roscommon, Westmeath and Wexford. The dataset comprises one Featureclass. In 2021, the data structure was reviewed and a new database was created in ArcGIS Enterprise. Using ArcGIS Pro 2.6.3, the dataset was renamed as part of a GSI data standardisation process. The sediment field was renamed and an alias added. The sediment code field was renamed and an alias added. Metadata was updated to the new GSI standard based on INSPIRE and ISO standards.