3 Collection and Verification of Field Data
In addition to quadripoles collected, it is highly advisable to collect (1) electrode contact resistance measurements, (2) stacked or repeated measurements, and (3) reciprocal measurements. As described below, these measurements allow the user to evaluate the quality of the data both in the field and later during analysis back in the office. Accurate assessment of measurement errors is often critical for obtaining an optimal image from the inversion procedure.