What do I need to do to perform a Linear Measured 3D Resistivity/IP/SP Survey? (a series of 2D lines with the correct 3D placement)

Follow the steps below to setup, run, and process the data of a Linear Measured 3D Resistivity/IP/SP survey.

IMPORTANT NOTE: Collect at least two parallel 2D survey lines for steps 1-9 below.

1. Stretch out a long tape measure in a straight line or mark with GPS to an accuracy of at least 10% of your deployed electrode spacing (scaling factor in Automatic Mode).

2. Install the stainless steel electrode stakes at the electrode spacing of your choosing.

3. Lay out the Electrode Cable and connect each takeout to each electrode stake.

4. Connect the SuperSting™ instrument and Switch Box to the Electrode Cable.

- NOTE: Depending on your switch box, use the following: (Dual-mode electrode cable users can connect anywhere)

- 28 electrode SwitchBox: Connect to electrode 1 or 28.

- 56 electrode SwitchBox: Connect between 28 (low-address connector) and 29 (high-address connector to male-to-male adaptor to electrode cable).

- 84 electrode SwitchBox: Connect between 42 (low-address connector) and 43 (high-address connector to male-to-male adaptor to electrode cable).

- 112 electrode SwitchBox: Connect between 56 (low-address connector) and 57 (high-address connector to male-to-male adaptor to electrode cable).

5. Connect the power source to the SuperSting™. The power source can be either a generator with power supply (preferred) or a 12 Volt deep cycle battery (One battery for normal or two for boost).

6. Perform the Contact Resistance Test as a last check that the system is connected correctly.

7. Gather the data (typically 5 min for 28 and more as SwitchBox size increases).

8. Transfer the data to a PC running Windows (NOTE: SuperStings prior to 2013 (non Wifi)). For SuperSting™ Wifi users, access the data using the SuperSting™ Manager Android App.

9. Process data using the AGI EarthImager™ 2D software:

- Read in data

- Set the defaults for a surface survey

- Press the Start Button (takes less than a second usually)

10. View and print the finished result.

NOTE: Assume that the first data scan in steps 1-10 was produced starting at the (0,0) coordinate along the X-axis.

11. Move the next 2D survey line one electrode spacing (ES) parallel to the first line and record the new starting coordinate.  This offset is in the Y direction.  Do not offset the Start X from zero.

Example: If the electrode spacing is 5 meters, then the new location for the second line is (x= 0 and y= 5).  Results will have artifacts if you do not maintain close enough spacing of the parallel 2D lines.  In this example, 5x5m is ideal.  You could run 5 x10m but run the risk of artifacts if there is very sharp contrast in the near surface.

12. Repeat steps 1-11.

14. Process the multiple parallel 2D lines using the AGI EarthImager™ 3D:

- Go to Tools -> Combine 2D Parallel Lines and save files to a new "combined" dataset.

- Read in the "combined" dataset.

- Set the defaults for a surface survey.

- Press the Start Button (takes less than a minute).

15. View and Print the finished result.

16.  NOTE: Filtering and optimization of inversion parameters may be needed if you see over smoothing of the 3D model vs 2D models.  Over smoothing is related to the sum of the noise for all the 2D lines loaded vs less noise in a singular 2D model.  The scope of these optimizations beyond this help article and may be site specific.  Please contact AGI for further assistance as needed.