Airborne geophysical survey: Illiamna

Aeromagnetic data were collected along flight lines by instruments in an aircraft that recorded magnetic-field intensity values and location. In surveys such as this one where the data were originally collected in digital form and not digitized from contour maps, the information we provide typically includes latitude, longitude, magnetic anomaly in nanoTeslas, and intermediate values used to derive the magnetic anomaly such as total magnetic field.

航空磁测数据由搭载于航空器的探测仪器沿飞行航线采集，同步记录磁场强度数值与位置信息。在本次这类原始数据以数字形式直接采集、而非从等值线图数字化获取的调查中，本次提供的数据集通常包含纬度、经度、以纳特斯拉（nanoTeslas）为单位的磁异常值，以及用于推导磁异常的中间参数（如总磁场强度）。