Abstract
Ground-penetrating radar (GPR) produces non-distinct regions of increased signal scatter when scanningperched water in a shallow sandy loam soil. This scatter phenomenon occurs due to the soils increased electricalconductivity, which exponentially increases with its water content, thereby increasing signal degradation. Radar signalscatter is presently being targeted as a perched water indicator for site-specific agricultural applications. This articlereports on a critical verification method developed to examine the effectiveness of using the traditional procedure inmanually interpreting GPR images for the detection of perched water. A blind test procedure found human perceptionclassification errors in the preliminary studies. Critical evaluation testing revealed that the image interpreters priorknowledge had unknowingly influenced image classifications. Rigorous blind testing of subjective manual interpretationof complex GPR images was determined essential prior to reporting successful GPR investigations. Project resultsillustrate that blind tests help insure against possible false interpretations and reporting when using this technology. Thiscritical evaluation procedure also demonstrated a need to develop automated classification procedures when analyzingcomplex GPR images, rather than relying solely on manual interpretations.
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