Airborne geophysical survey: Winnemucca, 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）由机载仪器沿飞行航线采集，记录了磁场强度值与位置信息。在早期勘测阶段，此类数据仅能通过绘制带有等值线的模拟地图进行展示。本数据集是对数字化等值线的重构：既可以通过沿等值线追踪采样，也可以通过选取等值线与飞行航线的交点来获取对应的磁场数值。所收录的数据包含纬度、经度与地图磁场值。