Airborne geophysical survey: Green Bay 1° x 2° Quadrangle

Aeromagnetic and aeroradiometric data were collected along flight lines by
instruments in an aircraft that recorded magnetic-field and radiometric
values and locations. The magnetic data set presents latitude, longitude,
altitude, and magnetic-field values. Geologic symbols or codes are also
included. The geologic symbols were picked from surficial geologic maps.
The radiometric data set presents latitude, longitude, altitude, geologic
symbols or codes, apparent Uranium (Bismuth 214), Thorium (Thallium 208),
and Potassium (K 40), the element ratios, and ancillary information.

本数据集包含航空磁测数据（aeromagnetic data）与航空放射性测量数据（aeroradiometric data），二者均由搭载于航空器的探测仪器沿飞行航线采集，该仪器可同步记录磁场参数、放射性测量值与采样位置信息。其中航空磁测数据集包含纬度、经度、海拔高度及磁场强度数据，同时附带地质符号或编码，所采用的地质符号源自表层地质图件。航空放射性测量数据集则涵盖纬度、经度、海拔高度、地质符号或编码、表观铀（以铋214表征）、钍（以铊208表征）、钾（K 40）含量、元素比值及辅助信息。