Airborne geophysical survey: Gros Ventre, Wyoming

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.

航空磁测数据由搭载于飞行器的仪器沿飞行测线采集，同步记录磁场强度值与采样位置。在航空磁测勘测的早期阶段，此类数据唯一的可视化表达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成果呈现，其生成方式包括沿等值线轨迹采样，或选取等值线与飞行测线的交点以获取对应磁场强度数值。本数据集所包含的数值字段为纬度、经度与地图磁场强度值。