3.3.2. Predicted Data File¶
Predicted data files are output by the code dcipoctree_fwd.exe , dcoctree_inv.exe and ipoctree_inv.exe . If DC data are being forward modeled, then a data_dc.txt file is output. If IP data are being forward modeled then both a data_dc.txt and data_ip.txt file are output. The format of these files are the same, except for the data columns.
The general format for predicted data files is shown below.
Note
Unlike for the survey file and observations file, the Z values are included in the predicted data file regardless of whether surface or general format is used .
where
\(X_A(i) \;\;\; Y_A(i) \;\;\; Z_A(i)\) is the Easting, Northing and vertical position of the A-electrode for source \(i\).
\(X_B(i) \;\;\; Y_B(i) \;\;\; Z_B(i)\) is the Easting, Northing and vertical position of the B-electrode for source \(i\).
\(X_M(i,j) \;\;\; Y_M(i,j) \;\;\; Z_M(i,j)\) is the Easting, Northing and vertical position of M-electrode associated with source \(i\) and receiver \(j\).
\(X_N(i,j) \;\;\; Y_N(i,j) \;\;\; Z_N(i,j)\) is the Easting, Northing and vertical position of N-electrode associated with source \(i\) and receiver \(j\).
\(DATA(i,j)\) is the datum associated with the \(i^{th}\) source and \(j^{th}\) receiver.
For DC data, \(DATA(i,j)\) represents a normalized voltage value followed by an apparent resistivity value.
For IP data, \(DATA(i,j)\) represents the IP data value defined in the input file (see line 1).
3.3.2.1. Example: Pole-Dipole Data¶
Below, we see the format for data_dc.txt and data_ip.txt. Since the sources are pole sources, we see that the locations of the A and B electrodes are identical. If the receivers were poles, the M and N locations of corresponding M and N electrodes would be identical.
Predicted DC Data
Predicted IP Data
