Helicopter-borne data from the Kongsberg and surrounding area are presented in two directories namely 'Images' and 'XYZ_files'. Maps of the whole survey area are divided in three parts for presentation namely Area1, Area2 and Area3 because data were collected and processed separately. The 'Images' directory contains JPEG and GEOTIFF images of various grids of Magnetic, Radiometric and Electromagnetic data. The 'XYZ_files' contains processed numerical data for these surveys. The used name conventions are explined below.    

Magnetic data are presented as:
 Total magnetic field anomaly grid	(Kong_Map1_Maganom)
 Magnetic vertical derivative grid	(Kong_Map1_MagVDR)
 Magnetic tilt derivative grid 		(Kong_Map1_MagTDR)
 Geosoft XYZ-file 				(Kongsberg_MAG_Area1.XYZ)


Radiometric data are presented as:
 Total radiation counts grid 				(Kong_Map1_TC)
 in conts/sec	
 Ground concentration of Potassium grid 		(Kong_Map1_K)
 in percentage
 Ground concentaration of Equivalent Uranium 	(Kong_Map1_U)
 in parts per million
 Ground concentration of equivalent Thorium (Kong_Map1_Th)
 in parts per million
 Geosoft XYZ-file			(Kongsberg_RAD_Area1.XYZ)


ElectroMagnetic data are presented as grids of apparent resistivities calculated from In-phase and Quadrature components at various fequencies using a homogeneous half-space model.
 
 from quadrature of 880 Hz 			(Kong_Map1_Res880Q)
 from quadrature of 980 Hz 			(Kong_Map1_Res980Q)  
 from in-phase and quadrature of 6606 Hz 	(Kong_Map1_Res6kIQ)  
 from in-phase and quadrature of 7001 Hz 	(Kong_Map1_Res7kIQ)  
 from in-phase and quadrature of 34133 Hz 	(Kong_Map1											_Res34kIQ)  
 Geosoft XYZ-file			  (Kongsberg_EM_Area1.XYZ)


The coloum names in the XYZ-files are explained as: 

X_ and Y_ 		: X and Y coordinates in UTM zone 32
UTC_Time		: UTC time
ALT_R_M		: Height (of helicopter) in meters from ground
ALT_R_M_STP	: Height calculated at STP (of helicopter) in 			  meters from ground
ALT_R_EM		: Height (of EM bird) in meters from ground
Mag_Anom		: IGRF corrected Total magnetic field anomaly in 			  nT
R_TC_60m		: Total radiation count calculated at 60 m 				  height in counts/sec
R_K_perc		: Ground concentration of potassium in 				  percentage
R_U_ppm		: Ground concentration of equivalent uranium in 			  parts per million
R_Th_ppm		: Ground concentration of equivalent Thorium in 			  parts per million
...­_MICNGU 	: Microlevelled data using NGU's in-house 				  software 
E_0i_880_F_L	: Levelled(L) in-phase(i) Electromagnetic(E) 			  data in ppm  at frequency 880 Hz(880) from 			  coils in horizontal coplanar geometry(0) 
E_1q_980_F_L	: Levelled(L) quadrature(q) Electromagnetic(E) 			  data in ppm  at frequency 980 Hz(980) from 			  coils in vertical co-axial geometry(1) 
..._6k_...		: at frequency 6606 Hz(6k) 
..._7k_...		: at frequency 7001 Hz(7k) 
..._34k_...	: at frequency 34133 Hz(34k) 

E_RES_880_Q 	: Apparent resistivity (RES) in ohm.m 					  calculated from quadrature(Q) component at 			  frequency 880 Hz(880)
..._IQ  		: calculated from in-phase and quadrature(IQ)  

..._neg		: In-phase and quadrature values were 					  multiplied by -1 to correct it for sign 				  conversion to  calculate correct apparent 			  resistivity 







For more information, contact: vikas.baranwal@ngu.no