Arctangent Bearing 1 Bivariate gaussian distributions 1 Cartesians 1 Cementing (shafts) 1 Close range 1 Electrolyte conduction 1 Electrolytes 1 Extended Kalman filters 1 Formation factor 1 Gaussian 1 Gaussian distribution 1 Gaussian noise (electronic) 1 Gaussians 1 Kalman filter 1 Mathematical transformations 1 Non-linear transformations 1 PDF 1 Percentage error 1 Polar transformations 1 Pore space 1 Probability density function 1 Reservoirs (water) 1 Sandstone 1 Shaly sandstone 1 State-variables 1 Surface conduction 1 Two-dimensional 1 Variable cementation factor 1 Water saturation 1