Airborne geophysical survey: Pittsburgh ARMS, Pennsylvania, Ohio, West Virginia, and Maryland

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.

航空磁力数据（Aeromagnetic data）由搭载于航空器的仪器沿飞行航线采集，同步记录磁场强度与位置信息。
在航空磁测的早期阶段，此类数据的唯一展示方式为生成带等值线的模拟地图。
本数据集为数字化等值线的重构结果，其构建方式分为两种：一是沿原始等值线轨迹进行数字化，二是选取等值线与飞行航线的交点并获取对应磁场强度数值。
本次数据集中记录的参数包括纬度、经度与航磁场强度值。