Aeromagnetic data over Nigeria

Aeromag_Nigeria has been extracted from (EMAG2v3) which is a global Earth Magnetic Anomaly Grid compiled from satellite, ship, and airborne magnetic measurements. Aeromag_Nigeria Format File Time Period 1946-01-01 to 2014-02-20 Spatial Reference System urn:ogc:def:crs:EPSG::4326 Column 1: LAT(DEG) ; Geographic Latitude WGS84 (decimal degrees) Column 2: LON(DEG) ; Geographic Longitude WGS84 (decimal degrees) Column 3: MAG4(nT) ; Magnetic Anomaly Value at continuous 4km altitude (nT) Column 4: MAG_SEA ; Magnetic Anomaly Value at Sea Level(nT) Column 6: LON-I ; grid column/longitude index Column 5: LAT-I ; grid row/latitude index Column 7: CODE ; Data Source Code (see table below) Column 8: ERR ; Error estimate (nT) 104 Central Atlantic 888 Ambiguou