Airborne geophysical survey: Northern New Hampshire '66

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。 在早期航空磁测作业中，此类数据仅能通过绘制带等值线的模拟地图进行可视化呈现。 本数据集为数字化等值线的重构产物：既可以沿等值线轨迹采集数据，也可通过选取等值线与飞行航线的交点来获取对应磁场数值。 本次公开的数据包含纬度、经度与磁场强度三类数值。