I have a question regarding the DASurveyReadings layer for the Direct Assessment surveys. What would be the difference between the pson and the dcpotentialvolts fields? In our completed DCVG surveys, our survey contractors provide the signal shift (mv) and overline remote earth (mv) voltage readings. We are wondering if those values belong in any of the fields in the existing Esri data model, or whether we may need to extend it. Thanks in advance!