Airborne geophysical survey: Area E2, Central Washington

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，同步记录磁场强度值与位置坐标。在航空磁测的早期勘测阶段，此类数据唯一的可视化方式为绘制带等值线的模拟地图。本数据集为数字化等值线的重构成果，其生成途径包含两种：一是沿等值线轨迹进行采样，二是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。本次公开的数据包含纬度、经度与对应磁场强度数值。