Airborne geophysical survey: Ely, Nevada

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）由飞行器搭载的仪器沿飞行航线采集，记录了磁场强度与位置信息。在早期勘探阶段，这类数据仅能通过绘制带等值线的模拟地图进行呈现。本数据集为数字化等值线的重构成果，其生成方式包括沿等值线追踪采样，或是选取等值线与飞行航线的交点以获取对应磁场数值。数据集包含的参数为纬度、经度与航磁图场值。