Airborne geophysical survey: Western Virginia (Includes Appalachian Strip)

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）由搭载于飞行器的仪器沿飞行航线采集，可记录磁场强度值与位置信息。在早期磁测工作中，呈现该数据的唯一方式为制作带有等高线（contour lines）的模拟地图。本数据集为数字化等高线的表现形式，其生成方式包括沿等高线轨迹采样，或是通过求取等高线与飞行航线的交点来获取对应的磁场强度数值。本次数据集包含的参数为纬度、经度以及地图磁场强度值。