When a multi-color colormap is applied to graphics display modules, subsurface anomalies really pop and can be easily detected. It needs to be imported as a point cloud, gridded, and then can be rendered using a VolRender or FaceRender module. More details about this workflow can be found on the group's YouTube page.Īfter the data has been transformed into an XYZC dataset, imaging it in Voxler is a simple endeavor. The group has developed a nifty technique that will parse the data taken from the meter and compile it into a single XYZC data file that is perfect for smooth importing into Voxler. Once the data for a survey area has been acquired, the Terra Exploration Group has simplified the process of compiling the data into a file format that is ready for use in Voxler. The ERT probes can be moved in a lateral direction to acquire data from multiple slices (on a grid), which can be then combined into a 3D point cloud and sent to Voxler for 3D imaging. The combined data from the different probe locations represent a slice of the subsurface, including any objects or anomalies. The resistivity differences aide in defining the location of target subsurface objects.ĭuring the survey, the probes are moved farther apart along a transect to take resistivity readings at different depths the farther apart the probes are located, the deeper the ERT survey goes. Subsurface objects or anomalies typically return higher (or lower) resistivity readings than that of the native soil and rock layers. The electrical current between the electrodes at the probe locations is then recorded. An ERT survey is a noninvasive data acquisition technique that uses electrodes attached to small probes that are pushed into the surface soil at a specified distance apart from one another. The EZ RES PRO resistance meter is used to perform Electrical Resistivity Tomography surveys, also known as ERTs.

This professional grade resistivity meter is deployed by geophysical surveyors who are trying to locate subsurface anomalies like water, mineral veins, caves, tunnels and even buried caches of treasure.

The Terra Exploration Group from Austin TX, who specializes in on-site geophysical surveys, is using Voxler to create 2D and 3D images based on data taken with the Terra EZ RES PRO earth resistance meter.

Import xyz to res2dinv