3.3.2. Predicted Data File¶
Predicted data files are output by the code dcipoctree_fwd.exe. If DC data are being simulated, then a data_dc.txt file is output. If IP data are being simulated, 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
The [ ] brackets are used for columns are not always required. For example, the Z value for surface data with flat topography.
where
\(X_A(i) \;\;\; Y_A(i) \;\;\; [Z_A(i)]\) is the Easting, Northing and vertical (if needed) position of the A-electrode for source \(i\).
\(X_B(i) \;\;\; Y_B(i) \;\;\; [Z_B(i)]\) is the Easting, Northing and vertical (if needed) 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 (if needed) 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 (if needed) 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 1: Dipole-Dipole Surface Data¶
For electrodes defined only on the surface, the vertical location is determined by the topography. As a result, columns for the vertical position of each electrode are not required. Below, we see the format for data_dc.txt and data_ip.txt. In this case, there are two sources, each with a different number of receivers.
Predicted Surface DC Data
Predicted Surface IP Data
3.3.2.2. Example 2: Pole-Dipole Data with General Format¶
For the general data format (surface and/or borehole), the vertical locations of the electrodes are defined. 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.
General Format Predicted DC Data
General Format Predicted IP Data
