This article provides the algorithm for computing the values of the reference field from the IGRF model and secular variation values. Spatial and attribute information. Quinn et al. The resulting data set was converted to shapefile format. Lines showing equal intensity of the horizontal component of the total field intensity.
Magnetic intensity is the strength of the magnetic field.
The representation of the entity in the data. Internal sequence number of the left polygon. The length of the line in coverage units. Internal feature number. Isovalue of the horizontal component of the total magnetic field intensity.