Airborne geophysical survey: Los Angeles 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.

航空磁测数据（aeromagnetic data）与航空放射性测量数据（aeroradiometric data）由航空器搭载的仪器沿飞行航线采集，同步记录磁场强度、放射性测量值与点位坐标。磁测数据集包含纬度、经度、海拔高度与磁场强度数据。同时附带地质符号或编码，该类地质符号源自表层地质图（surficial geologic maps）。放射性测量数据集则包含纬度、经度、海拔高度、地质符号或编码、视铀（apparent Uranium，以铋214（Bismuth 214）标定）、钍（Thorium，以铊208（Thallium 208）标定）、钾（K 40，Potassium (K 40)）、元素比值及辅助信息。