Tellus Airborne Geophysics — Magnetic Intensity

The latest merged airborne magnetic Intensity 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. The data is recorded at 10 Hz and measured in nano-Tesla, along survey lines orientated 165 degrees and a spacing line of 200 m. 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 Magnetic Intensity data has been collected on a seasonal basis and quality controlled before being merged. All seasonal survey block are available to download on an individual basis and are available at tellus.ie. 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).本数据集为爱尔兰地质调查局（Geological Survey Ireland）管理的Tellus项目（Tellus project）最新合并航空磁强度数据（airborne magnetic intensity data）。本次测量由飞行高度59米的调查飞机搭载相关设备完成，数据采样率为10赫兹，单位为纳特斯拉（nano-Tesla），测线方位角为165度，测线间距为200米。数据采用最小曲率算法（minimum curvature algorithm）进行网格化处理，经过日变校正与国际地磁参考场（IGRF）校正，并完成控制测线平差。不同数据集的网格通过Geosoft缝合法（Geosoft suture method）进行拼接，随后重采样至主数据库。数据采用爱尔兰横轴墨卡托投影（ITM）与经纬度坐标系存储。 该最新合并的航空磁强度数据按季度采集，并在合并前经过严格质量控制。所有季度调查区块均可单独下载，下载地址为tellus.ie。各调查区块的名称、覆盖年份及范围如下： 1. 查尔斯敦调查区块（2006年，覆盖卡文郡、莫纳亨郡查尔斯敦周边区域）（行业资助项目） 2. Tellus边境调查区块（2001-2013年，覆盖多尼戈尔郡、斯莱戈郡、利特里姆郡、卡文郡、莫纳亨郡、劳斯郡） 3. Tellus中北部地区调查区块（2014年，覆盖罗斯康芒郡、朗福德郡与韦斯特米斯郡部分区域） 4. Tellus A1调查区块（2015年，覆盖米斯郡、基尔代尔郡、奥法利郡、都柏林乡村地区以及莱伊什郡、威克洛郡部分区域） 5. Tellus A2调查区块（2016年，覆盖戈尔韦郡，包含梅奥郡、蒂珀雷里郡与奥法利郡部分区域） 6. Tellus沃特福德调查区块（2016年，覆盖沃特福德郡东部、蒂珀雷里郡南部、基尔肯尼郡以及韦克斯福德郡西部部分区域） 7. Tellus A3调查区块（2017年，覆盖梅奥郡，包含戈尔韦郡部分区域） 8. Tellus A4调查区块（2017年，覆盖多尼戈尔郡） 此外可获取的数据集还包括： - 矿山场址航空测量数据（2006年，查尔斯敦区块、蒂珀雷里郡西尔弗迈恩斯地区以及凯里郡卡斯尔岛地区），该数据已于2016年完成重新处理并发布技术报告。 - 亨廷顿地质与地球物理有限公司（Hunting Geology and Geophysics Ltd）开展的低分辨率航空磁强度测量（1979-1981年，覆盖爱尔兰中部地区）。