Airborne geophysical survey: Bridgeport, Connecticut (Includes part of Brookhaven ARMS '58)

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）由飞行器搭载的探测仪器沿飞行航线采集，同步记录磁场强度数值与定位坐标。在早期航空磁测作业阶段，此类数据仅能通过绘制带有等值线的模拟地图实现可视化呈现。本数据集为数字化等值线的重构产物，其生成路径包含两种：一是沿原始等值线进行追踪采样，二是选取等值线与飞行航线的交点以获取对应磁场数值。本次发布的数据包含纬度、经度与制图用磁场强度数值。