3.3.1. Survey Index FileΒΆ

This file is input when forward modeling data. Using 4 columns, the observation file indexes the frequencies, transmitters and receivers used for each measurement. Each row defines a unique field measurement. The general format is as follows:

tx_ind \(\;\) f_ind \(\;\) rx_ind \(\;\) data_opt
tx_ind \(\;\) f_ind \(\;\) rx_ind \(\;\) data_opt
tx_ind \(\;\) f_ind \(\;\) rx_ind \(\;\) data_opt
\(\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\; \vdots\)
tx_ind \(\;\) f_ind \(\;\) rx_ind \(\;\) data_opt


Important

Due to the way the forward problem is solved, it is imperative that the user sort the survey index file:
  • First by transmitter

  • Next by frequency

  • Then finally by receiver

Parameter Descriptions

  • tx_ind: The index corresponding to the desired transmitter within the transmitter file.

  • f_ind: The index corresponding to the desired frequency within the frequencies file.

  • rx_ind: The index corresponding to the desired receiver within the receiver file.

  • 1: As of May 2018, a flag value of 1 is entered here. In future iterations of the code, this entry may be related to additional functionality.