Airborne Geophysics Magnetic Data Ireland (ROI/NI) ITM TIFF
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The survey data combines data from a number of different surveys into one merged Dataset. The individual surveys consist of; (1) Tellus Northern Ireland, 2005 @-@ 2006 (2) Cavan @-@ Monaghan, 2006 (3) Tellus Border, 2011 @-@ 2012 (4) Tellus North Midlands, 2014 @-@ 2015 (5) Block A1, 2015 (6) Block A2, 2016 (7) Waterford, 2016 (8) Block A3, 2017 (9) Block A4, 2017 (10) Block A5, 2018 @-@ 2019 (11) Block A6, 2018 @-@ 2019 (12) Block A7, 2019 Combined a total of 382.567 km of data were collected over a total area of approximately 70.438 km². The plane flew along survey lines 200 m apart at a height of about 60 m. The system measures the Earth’s Magnetic Field and how it changes due to different types of rock. This data shows the magnetic gradient (changes in the magnetic field). The magnetic gradient Allows us to map different types of rock close to the surface. This is a raster Dataset. Raster data stores information in a cell-based manner and consists of a matrix of cells (or Pixels) organised into rows and columns. The format of the raster is an image (TIFF). The image cell size is 50 m which means that each cell (pixel) represents an area on the ground that is 50 meters across. The image also contains location information (GEOTIFF). Each cell has a different colour representing the magnetic gradient of the rocks: black for low, grey for medium and white for high. The Tellus survey is a national Airborne Geophysical and ground geochemical mapping project managed by the Geological Survey Ireland.
本调研数据集将多项独立调研的数据整合为单一合并数据集。各独立调研详情如下: 1. 泰勒斯(Tellus)北爱尔兰调研,2005年至2006年 2. 卡万-莫纳汉(Cavan-Monaghan)调研,2006年 3. 泰勒斯边境(Tellus Border)调研,2011年至2012年 4. 泰勒斯北中部(Tellus North Midlands)调研,2014年至2015年 5. A1区块调研,2015年 6. A2区块调研,2016年 7. 沃特福德(Waterford)调研,2016年 8. A3区块调研,2017年 9. A4区块调研,2017年 10. A5区块调研,2018年至2019年 11. A6区块调研,2018年至2019年 12. A7区块调研,2019年 本次整合调研累计采集总长382.567千米的数据,覆盖总面积约70.438平方千米。调研飞行期间,飞机沿测线飞行,测线间距为200米,飞行高度约60米。 该系统可监测地球磁场及其因不同岩石类型产生的变化,所获数据可反映磁梯度(即磁场的变化量)。磁梯度数据可用于绘制地表附近不同岩石类型的分布图谱。 本数据集为栅格数据集(raster Dataset)。栅格数据以单元格为基础存储信息,由按行、列排布的单元格(或像素)矩阵组成。该栅格数据采用影像格式(TIFF)存储,影像单元格尺寸为50米,即每个单元格(像素)对应地面上50米见方的区域。该影像附带位置信息(GEOTIFF)。每个单元格以不同颜色表征岩石的磁梯度值:黑色代表低磁梯度,灰色代表中等磁梯度,白色代表高磁梯度。 泰勒斯(Tellus)调研是由爱尔兰地质调查局(Geological Survey Ireland)管理的国家级航空地球物理与地面地球化学填图项目。



