Airborne geophysical survey: Golden Trout, California

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（aeromagnetic data）由搭载于航空器的仪器沿飞行航线采集，同步记录磁场强度与位置信息。在早期航空磁测作业中，此类数据唯一的可视化方式为生成带等值线（contour lines）的模拟地图。本数据集为数字化等值线的重构结果，重构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对应的磁场强度数值。所提供的字段包含纬度、经度与航图磁场强度值。