Airborne geophysical survey: Iditarod 1° x 3° 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.

本数据集涵盖航空磁测与航空放射性测量两类数据，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、放射性测量参数及测点空间位置。航空磁测数据集包含测点纬度、经度、海拔高度及磁场强度值，同时附带地质符号或编码，该类地质符号均取自地表地质图件。航空放射性测量数据集则包含测点纬度、经度、海拔高度、地质符号或编码、表观铀（铋214）、钍（铊208）、钾（K 40）含量、元素比值及辅助观测信息。