Airborne geophysical survey: Northwest Illinois, Illinois

Aeromagnetic data were collected along flight lines by instruments in an
aircraft that recorded magnetic-field values and locations. This dataset
presents latitude, longitude, altitude, and magnetic-field values.

航空磁测数据由搭载于航空器的测量仪器沿飞行航线采集，仪器同步记录磁场强度值与位置信息。本数据集包含纬度、经度、海拔高度以及磁场强度值四类数据。