Updating Soil Depth Class Information in North Dakota with Ground-Penetrating Radar

Finding the Soil Surface in GPR Profiles: The Lift Test

“…Depths to subsurface interfaces could be misplaced by 30 cm or more without proper placement of the soil surface on the GPR profile. While relatively small, this error could be important for near‐surface investigations where accurate depth measurements are important, such as evaluating soil suitability for septic systems or determining soil depth (Doolittle et al, 2004) or depth to diagnostic soil horizons. In our case, we were using GPR surveys to determine whether and where drainage ditches may have penetrated thin (30‐cm‐thick) clay layers in a wetland restoration site (Szuch et al, 2006).…”