Airborne geophysical survey: Winkleman (Mammoth), Arizona

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，同步记录磁场强度与点位坐标。在航空磁测的早期勘测阶段，该类数据唯一的可视化方式为生成带等值线的模拟地图。本数据集为数字化等值线的成果，其数字化采样方式分为两类：一是沿等值线轨迹采集点位数据，二是选取等值线与飞行航线的交点作为采样点以获取对应磁场数值。本数据集包含的字段为纬度、经度与磁场强度数值。