Airborne geophysical survey: Southwest Piedmont, Virginia

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.

本数据集的航空磁测数据由机载仪器沿飞行航线采集，同步记录磁场强度与地理位置信息。早期磁测勘探阶段，此类数据仅能通过绘制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复刻成果，可通过沿等值线轨迹采集点位，或选取等值线与飞行航线的交点生成对应磁场强度数值。数据集包含的参数包括纬度、经度与测点磁场强度值。