3.3.1. Survey Index FileΒΆ
This file is input when forward modeling data. Using 4 columns, the observation file indexes the transmitters, receivers and time channels used for each measurement. Each row defines a unique field measurement. The general format is as follows:
Click here to see an example file for an airborne TEM survey.
Important
Due to the way the forward problem is solved, it is imperative that the user sort the observations:
First by transmitter
Then by receiver
Then by time channel
Parameter Descriptions
tx_ind: The index corresponding to the desired transmitter within the transmitter file.
rx_ind: The index corresponding to the desired receiver within the receiver file.
t_ind: The index corresponding to the desired time within the time channel file.
data_opt:
A flag value of 2 is entered if the datum is the magnetic field H in units A/m
A flag value of 1 is entered if the datum is the time-derivative dB/dt in units T/s