Airborne geophysical survey: Oxbow '57

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）由机载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，此类数据仅能通过绘制带有等值线的模拟地图进行展示。本数据集为数字化等值线的重构产物，其重构方式分为两类：一是沿等值线轨迹进行采样，二是选取等值线与飞行航线的交点以获取对应的磁场数值。数据集包含的字段为纬度、经度与航磁场数值。