Airborne geophysical survey: Sugar Loaf, Maryland

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）由机载仪器沿飞行测线采集，同步记录磁场强度与位置信息。在早期磁测勘探阶段，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。本数据集是对数字化等值线的结构化呈现：既可以通过沿等值线追踪采样，也可以通过选取等值线与飞行测线的交点来获取对应磁场强度数值。所呈现的参数包含纬度、经度与图面磁场强度数值。