Airborne geophysical survey: Phoenix '63, Arizona

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。在磁测作业的早期阶段，此类数据仅能通过生成带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，重构方式包含沿等值线追踪采样，或是选取等值线与飞行航线的交点以获取对应磁场数值。数据集所包含的数值项为纬度、经度与航图磁场值。