4.1.3.1. Data Manipulation 4.1.3.1.1. Calculate: Transform between apparent resistivity and normalized voltage 4.1.3.1.2. Convert DC/IP 3D data to 2D 4.1.3.1.3. Convert DCdata to IPdata 4.1.3.1.4. Apply topography to DC/IP data 4.1.3.1.5. Remove Negative data value