GSI National Draft Generalised Bedrock Map

Theme: Science
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This dataset contains bedrock units created by grouping bedrock formations and members based on their hydrogeological properties and other factors.

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Theme Science
Date dataset released 2006-01-23
Date dataset updated 2016-04-13
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 license conditions apply', 'https://creativecommons.org/licenses/by/4.0/', 'license', 'https://creativecommons.org/licenses/by/4.0/', 'license']
Update frequency Never
Language English
Landing Page http://spatial.dcenr.gov.ie/GeologicalSurvey/Groundwater/index.html
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) TM75 / Irish Grid (EPSG:29903)
Vertical Extent {"maxVerticalExtent": "1041", "verticalDomainName": "sea level", "minVerticalExtent": "0"}
Provenance information This dataset comprises 6 key shape files: Final100kunion.shp, Final100kstra.shp, Final100kstru.shp, Cross100ksection.shp, Final100kmin.shp and 100kpoly.shp. Date (dd/mm/yyyy) 19/11/2003 Originator Geological Survey of Ireland Nature of change/update to data All maps together into a seamless in Arc View. Each map sheet commenced in Arc Info generated new geological coverages representing Stratigraphy, Lithology, Igneous, Diagenetic, Dynamic, Thermal, and Geological Linework. All Arc Info coverages were converted to shapefile format. Methodology Bedrock AutoCAD layers were converted to .dxf format and imported into Arc Info 7.x. For each map sheet Arc Info aml, filtered out relevant Bedrock AutoCAD layers to generate new Arc Info coverages. Each map sheet commenced in Arc Info generated new geological coverages representing Stratigraphy, Lithology, Igneous, Diagenetic, Dynamic, Thermal, and Geological Linework. All Arc Info coverages were converted to shapefile format. In 2003 it was decided to join all the maps together into a seamless in Arc View, this involved Bedrock, Cartography and Information Technology and Groundwater Section. As the compilation of the series progressed over than a decade, some of the sheet boundaries inevitably did not match due to more recent interpretations as well as minor problems with the rasters not quiet matching. The geological interpretation was "fudged" in order to ensure that boundaries and polygons crossed sheet boundaries where appropriate and joined up. Cartography introduced Arc GIS 8.x in 2002 to undertake necessary seamless geoprocessing exercise on map sheet-by-sheet basis. The following layers were utilised from original Arc Info coverage map layers: Stratigraphy, Igneous, Lithology, Diagenetic and Geological Linework. The geological linework was divided into two separate shape files: Structural units and Stratigraphic units. The original Arc Info coverages had a limited number of fields and did not possess unique code identifier. A new coding system was introduced to establish unique code field called 'NEWCODE'. All Bedrock section's data from their main database at this time (Dataflex) was converted to Microsoft Access. A procedure was then used to join and populate additional records as map sheets were added and merged. Sheet joins and editing then commenced and quality control checks were introduced at interval and final stages. All relevant symbology was created and customized in Arc GIS. All relevant symbology was created and customized in Arc GIS. Sources Used as input Data for the Change /update Data capture & compilation from GSI Field Surveys in 1845 to 2003 performed by Bedrock Section. Data was collected both internally by GSI and also from external data sources. Data in the form of six inch and one inch maps deposited by exploration companies along with borehole logs and locations were also used in the 1:100,000 compilations (data useful in the midlands Carboniferous). The 1:100,000 series also used field surveys (mostly 6'' to the mile) carried out in MSc/PhD mapping made available to GSI by Universities in Ireland and further a field. Scripts/tools used Bedrock used AutoCad12 with their red book procedure on creation of geological layers. CU used cartographic' software ext. (A customised Arc Info module to facilitate map production process). CU imported Bedrock data in DXF format and filtered layers in geological thematic GIS 'coverages'. Customised aml code was transparent and could be accessed and edited by CU. Arc Scan ext. performed raster vector conversion preformed by heads up digitising. Marginalia was greated by aml scripts and generated by Cartography. Arc Info 7.x and AutoCAD tools. Final100union.shp, Final100kstra.shp and final100stru.shp were imported into a featured set in an ArcGis Arcinfo 8.3 geodatabase. A topology was created for the final100kunion feature class with rules of "Must Not Overlap" and "Must Not have Gaps" with a cluster tolerance of one metre. Most errors related to the coastline, lakes and river channels. All errors were checked and fixed using the topology toolbar and Editor toolbar leaving 3514 "Must not have gaps" errors. The feature classes were then exported as a shapefile. Contact details for further information on scripts/Tools Andy Sleeman and Markus Pracht from the Bedrock Section and Eddie McMonagle from the Cartography Section of the Geological Survey of Ireland, Beggars Bush, Haddington Road, Dublin 4. Rockunits.shp Date (dd/mm/yyyy).- 11/08/2003 Originator.- Groundwater Section of the Geological Survey of Ireland. Nature of change/update to data Twentyseven Rock Unit Groups were created by grouping over 1200 geological Formations and Members from the original bedrock geology file. Methodology.- Arc GIS 8.3 Merge and Dissolve options were used to group polygons. Sources Used as input Data for the Change /update.- Minor errors derived from original file have been detected and they are to be fixed in the future. Scripts/tools used.- Arc GIS 8.3 tools. Contact details for further information on scripts/Tools.- File created by Taly Hunter Williams, Groundwater Section, Geological Survey of Ireland, Beggars Bush, Haddington Road, Dublin 4.
Period of time covered (begin) 2000-01-01
Period of time covered (end) 2012-01-10