Magnetometry Method, 2

This is done as demonstrated in the following table, comments upon this follow. A flowchart illustrating the process of creating magnetic maps from raw measurements and corrections. This total field map can then be reduced to the pole, resulting in a total field map reduced to the pole. It can be further extended to another altitude, creating a map of the total reduced field extended to another altitude. Simultaneously, the total field map can be used to create a vertical gradient map. This vertical gradient map can also be extended to another altitude, resulting in a map of the vertical gradient extended to another altitude. https://www.w3.org/1999/xlink" xlink:href=" https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003761020/e10523ab-dbe3-4c4f-8f3e-863ae3683950/content/pg360_1.tif "/> The TOTAL FIELD MAP is the basic document. However, a structure gives, on this map, an anomaly of which the shape depends greatly upon latitude (1). In effect, the total field is due mainly to the non dipole field caused by the structure and dipole field. These fields add vectorially where the dipole field varies in direction from the equator to the pole. The magnetic inclination varies from 0 (at the magnetic equator) to 90 (at the magnetic poles). These considerations justify the following document : The TOTAL FIELD MAP REDUCED TO THE POLE, which gives the total field map which would be obtained, all things being equal, had the survey been carried out at the pole.