Airborne geophysical survey: Austin, 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所得，同步记录磁场强度与位置信息。在航空磁测工作的早期阶段，该类数据仅能通过绘制带等值线的模拟地图进行呈现。本数据集通过两种方式对数字化等值线进行还原：一是沿等值线轨迹进行采样，二是选取等值线与飞行航线的交点以获取对应的磁场数值。数据集包含的字段为纬度、经度以及地图磁场数值。