Airborne geophysical survey: Glasgow 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.

航空磁测数据由航空器搭载的测量仪器沿飞行航线采集，同步记录磁场强度与位置坐标。在早期航空勘测阶段，此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呈现形式，其数据生成方式包括沿等值线轨迹采样，或选取等值线与飞行航线的交点以获取磁场强度数值。本次收录的数据包含纬度、经度与航图磁场强度数值。