Airborne geophysical survey: Linn-Augusta area, Missouri

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，记录磁场强度与位置坐标。在航空磁测的早期阶段，该数据仅能通过生成带等值线（contour lines）的模拟地图进行可视化呈现。本数据集为数字化等值线的表现形式，通过沿等值线采样或选取等值线与飞行航线的交点来获取磁场数值。本次收录的数值包含纬度、经度以及区域磁场强度值。