Tellus Airborne Geophysics - Electromagnetics

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The latest merged airborne Electromagnetic data from the Tellus project, managed by the Geological Survey Ireland. The survey was conducted using an from a survey aircraft flying at an altitude of 59 meters.
Electromagnetic map is delivered in milli-Siemens per metre (mS/m). The merged data is delivered in both 3KHz and 12 KHz. The survey lines were orientated 165 degrees and line spacing of 200m. Data is gridded using a minimum curvature algorithm. Data is diurnally and IGRF corrected and control line levelled. Different datasets grids were stitched together using the Geosoft suture method and then re-sampled to a master database. Data is recorded in Irish Transverse Mercator (ITM) and latitude and longitude. The latest merged Electromagnetic data has been collected on a seasonal basis and quality controlled before being merged. Each seasonal survey block are available to download on an individual basis and are available at The survey block names, year and area they cover is as follows: Charlestown survey block (2006 – Area surrounding Charlestown, Co Cavan, Monaghan) (Industry funded) Tellus Border survey block (2001-2013, Co Donegal, Sligo, Leitrim, Cavan, Monaghan, Louth) Tellus North Midlands survey block (2014, Parts of Co Roscommon, Longford and Westmeath) Tellus A1 survey block (2015, covering parts of Co Meath, Kildare, Offaly rural Dublin and parts of Laois, Wicklow) Tellus A2 block (2016, Co Galway. Including parts of Mayo, Tipperary and Offaly) Tellus Waterford survey block (2016,Eastern Waterford, parts of southern Tipperary, Kilkenny and western Wexford) Tellus A3 block (2017, Co Mayo, including parts of Galway) Tellus A4 block (2017, Co Donegal) Also available: Mine site airborne surveys (2006, Charlestown block, Silvermines (Co Tipperary) and Castleisland(Co Kerry)) this data was reprocessed and technical report available in 2016.Hunting Geology and Geophysics Ltd, low resolution Magnetic Intensity survey (1979-1981, across central Ireland).

Data Resources (9)

available as xyz(zipped)
available as rest service, arcgis
available as json
available as rest service, arcgis
available as json
available as zip
available as PDF
available as webapp
available as website

Data Resource Preview - Download Latest Factsheet pdf

Theme Environment
Date dataset released 2012-07-09
Date dataset updated 2018-03-08
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 licence conditions apply', '', 'license', '', 'license']
Update frequency Other
Language English
Landing Page
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) TM75 / Irish Grid (EPSG:29903)
Vertical Extent {"maxVerticalExtent": "375.342", "verticalDomainName": "sea level", "minVerticalExtent": "-43.3419"}
Provenance information Data quality control reports available in the publications section of the Geological Survey Ireland Website
Period of time covered (begin) 2011-01-10