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GSI Metadata Geotechnical Boreholes |
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1.Metadata Reference
Metadata Date (dd/mm/yyyy): 20th February 2007
Last Date (dd/mm/yyyy): 20th February 2007
2.Identification Information
Title: Geotech Map Viewer digital data
Description: This dataset contains borehole information obtained from the digital data from the National Geotechnical Borehole Database.
Keywords: Geotechnical reports, boreholes, trial pits, geotechnical, tests, Depth to bedrock, Bedrock met/not met, polygons, borehole.
Version: 1.0
Language: English
Data type: tabular (dbf), geodatabase feature.
3.Lineage Information
Originator org- The Geotechnical Section of the Geological Survey of Ireland.
Other contributors-
Technical contact details-
Contact Name: Silvia Caloca Casado
Organisation: Geological Survey of
Contact Address: Information Management,
Geological Survey of
Beggar's Bush,
Principle data capture Technique-
Output of records from the Geodatabase.
4.Lineage Records
4.1.Filename: National Geotechnical Borehole Database.
Date (dd/mm/yyyy): Databank assembled from the late 1960s/ early 1970s.
Originator.- The Geotechnical Section of the Geological Survey of
Nature of change/update to data
Ongoing addition of new data as more reports are received. Ongoing validation of data input. Ongoing digitising of borehole/trial pit locations. Updating every time a new record is entered into the Oracle database.
Methodology.-
Information entered in an Oracle database.
Sources Used as input Data for the change /update.-
Main data sources for the data input/ editing are the geotechnical reports.
Scripts/tools used.-
None
Contact details for further information on scripts/Tools.-
Ronnie Creighton, Geotechnical Section, Geological Survey of
4.2.Filename: Geotech MapViewer (All_boreholes.mdb)
Date (dd/mm/yyyy): January 2007
Originator.- The Geotechnical Section of the Geological Survey of
Nature of change/update to data
Data have been output from the Geodatabase and imported into ArcGIS as a XY’s file.
Methodology.-
Borehole data was exported from the Geodatabase into ArcGIS.
Sources Used as input Data for the change /update.-
One of the table form the geodatabase called “Borehole_Description”.
Scripts/tools used.-
None
Contact details for further information on scripts/Tools.-
Ronnie Creighton, Geotechnical Section, Geological Survey of
4.3.Filename: “boreholes_met. mdb” and “boreholes_not_met. mdb”
Date (dd/mm/yyyy): January 2007
Originator.- The Geotechnical Section of the Geological Survey of
Nature of change/update to data
Selected and output from All_boreholes.mdb.
Methodology.-
From the “Borehole_Description” table, a selection was done based on the DTB_CONFID so the boreholes were split in those with bedrock met and not met and exported as a Personal Geodatabase feature class.
Sources Used as input Data for the change /update.-
One of the table from the geodatabase called “Borehole_Description”.
Scripts/tools used.-
None
Contact details for further information on scripts/Tools.-
Ronnie Creighton, Geotechnical Section, Geological Survey of
4.4.Filename: “boreholes_met. shp” and “boreholes_not_met.shp”
Date (dd/mm/yyyy): January 2007
Originator.- The Geotechnical Section of the Geological Survey of
Nature of change/update to data
Boreholes_met. mdb” and “boreholes_not_met.mdb were converted into a shapefile
Methodology.-
Boreholes_met. mdb” and “boreholes_not_met.mdb were exported as shapefiles using the ArcGIS 9.1 conversion tools.
Sources Used as input Data for the change /update.-
Boreholes_met. mdb” and “boreholes_not_met.mdb previously used.
Scripts/tools used.-
None
Contact details for further information on scripts/Tools.-
Edel O’Regan, Information Management Section, Geological Survey of
5.File Structure and maintenance information
Authorised by: - Koen Verbruggen (IMP, Geological Survey of
Maintenance/ Update frequency- Not planned
6.Data dictionary: File Name/Field Description/ Field Type
REPORTID: Report identification number/ double.
EASTING. -Five-figure reference for the east-to-west grid coordinates/ Long integer.
NORTHING Five-figure reference for the north-to-south grid coordinates/ Long integer.
IVESTIGATION_ID.- Borehole identification number/Long integer
OD MALIN. Correct elevation in metres Malin /double
DTB_Bdk_m.- Depth from the ground surface to the top of the bedrock in metres/double.
DTB CONFID.- Grade of confidence for meeting bedrock/text.
DEPTH_HOLE.- Total depth of the borehole in metres/double.
DTB_text_field.-DTB greater than the DEPTH of the hole/ Text.
COMPANYHOLENAME.- Alternative borehole name given by the drilling company, e.g BH 5, TW 2/text.
INV TYPE DESCRIPTION.- Borehole investigation type of drilling used/Text.
7.Geographical information
Reference system: Irish National Grid
Spatial Extent: Whole of
Additional extent:
Scale: 1:5,000 maps using for digitizing boreholes.
8.Distribution Information
Filename: “boreholes_met. mdb” and “boreholes_not_met. mdb”
Holder: Geological Survey of
Distributor contract details:
Ray Scanlon
Geological Survey of
Beggar's Bush,
Storage Format: Personal Geodatabase feature class.
Supply Format: Personal Geodatabase feature class, ArcGIS shapefile.
Supply media: CD-Rom
File size: 0.97MB IN Access (boreholes_met) and 1.58 MB(boreholes_no_met)
Copyright: Use of the data are constrained only by the GSI GIS Data License Agreement
Other Restrictions: a cost maybe charged for the access to the data.
9.Quality Ratings
Spatial Accuracy: Site plans and borehole locations are digitised in Map Object software on 1:5,000 digital maps for main urban areas (accuracy field, mostly <10m) and elsewhere on 1:50,000 digital base maps. Grid References are six figure references for both northing and easting. This accuracy would also apply to these dataset for being a sub-dataset from the National Geotechnical Borehole Database.
Thematic Accuracy
Correct description and names of the fields have been given.
Currency
The information available is accurate and currently in use.
Logical Consistency
Fields were filled in correctly so that there are no inconsistencies.