GPR Post Processing
Three levels of GPR data processing:
Onsite GPR data processing: Data is processed and interpreted on the fly. Little or no processing QA/QC. Lowest level of horizontal and vertical accuracy.
Basic GPR data processing: A preset pathway with limited parameter selection and QA/QC; Moderate level of horizontal and vertical accuracy.
Post or advanced GPR data processing: Numerous tools to attenuate coherent and incoherent noise; Strong QA/QC; Highest confidence of interpretation with exceptional vertical and horizontal location accuracy.
Why Post Processing?
The quality of the collected GPR data is based on the acquisition parameters, the nature of the ground conditions and the complexity of the subsurface features. With post processing, the image can be significantly enhanced using relevant QC tools and parameter selections.
If the preset processing steps are insufficient in suppressing organized and random noise, any interpretation may lead to confusing and erroneous conclusions.
The Basic processing (left image) shows remnant incoherent noise, unsuccessfully removed with spatial filtering. The GPR data was acquired over a cultivated field which produced time invariant lateral banding. Advanced filtering techniques prior to spatial filtering, significantly improves the signal to noise ratio, as shown in the post processed display (right image).