Airborne geophysical survey: Black Mountains (Death Valley), 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.

航空磁力数据（Aeromagnetic data）由机载采集仪器沿飞行航线获取，同步记录磁场强度与空间位置信息。早期航空磁测勘探时期，此类数据唯一的可视化呈现方式为制作带等值线（contour lines）的模拟地图。本数据集通过两种方式实现数字化等值线的还原与呈现：一是沿等值线轨迹进行数据采样，二是选取等值线与飞行航线的交点以生成对应磁场强度数值。本次收录的数据包含纬度、经度以及测点磁场强度数值。