Airborne geophysical survey: Raft River '79

Aeromagnetic data were collected along flight lines by instruments in an aircraft that recorded magnetic-field values and locations. In the earlier days of surveying, the only way to represent this data was to generate an analog map with contour lines. This dataset is a representation of the digitized contour lines either by following the lines or by choosing the intersection of the contour and flight-line to create a value of the magnetic field. The values presented are latitude, longitude, and map magnetic-field values.航空磁测数据（Aeromagnetic data）由飞行器搭载的仪器沿飞行航线采集，同步记录磁场数值与位置信息。在航空磁测勘探的早期阶段，此类数据唯一的可视化方式是制作带有等值线的模拟地图。本数据集为数字化等值线的成果：可通过沿等值线追踪采样，或选取等值线与飞行航线的交点来获取对应的磁场数值。本次呈现的数值包含纬度、经度与实测磁场值。