Airborne geophysical survey: Columbus ARMS

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）由机载仪器沿飞行航线采集，同步记录磁场强度与位置信息。在航磁测量的早期阶段，此类数据唯一的可视化表达方式为绘制带有等值线的模拟地图。本数据集为数字化等值线的标准化呈现成果，可通过沿等值线追踪，或选取等值线与飞行航线的交点来获取对应的磁场强度数值。本次公开的数据包含纬度、经度与航磁场强度数值。