IE GSI GSNI Magnetic First Vertical Derivative 50m Ireland (ROI/NI) ITM GRID

From a plane, this survey measures the magnetic strength of rocks below. This allows us to map different types of rocks, even in areas were rocks are covered by soil. The findings tell us about the rocks in the ground. This is useful if you want to drill for water or to help find minerals (materials taken from the ground used for things we need from mobile phones to the stones used to build roads and houses).