Using TNT-NN to unlock the fast full spatial inversion of large magnetic microscopy data sets

Earth, Planets and Space

Table 4 Summary of the unidirectional speleothem inversion parameters and results

Method	P	Q	\(\theta\) (\(^\circ\))	\(\phi\) (\(^{\circ }\))	m (Am\(^2\))	Residual RMS (nT)
TNT-NN	90681	90681	0	0	\(2.16\times 10^{-8}\)	\(7.68\times 10^{-1}\)
Fourier	90681	90681	0	0	\(1.43\times 10^{-8}\)	\(9.54\times 10^{-1}\)
2G	–	–	90	270	\(1.33\times 10^{-8}\)	–

The first column shows the method used to obtain results: the numerical method or a 2G Enterprises Superconducting Rock Magnetometer (2G, shown in final row). The second column, P, is the number of sample points collected by the scanning SQUID microscope. The third column shows that we set the number of dipoles, Q, equal to the number of samples for this inversion. The fourth and fifth columns give the unidirectional orientation of the dipoles as used for NNLS analysis. The sixth column lists the moment, m. The final column provides the residual RMS of the NNLS fits with the B\(_z\) field