Multi-method survey
Definition
The deployment of two or more independent geophysical methods over the same search area. Anomalies confirmed by multiple methods carry higher confidence because they are unlikely to share the same false-positive sources.
Related terms
- Dielectric permittivity
- A soil's capacity to store and transmit electric field energy. Higher water content raises permittivity and slows the radar wave. The contrast...
- Electrical resistivity
- The resistance of a volume of soil to electrical current flow. Wet, clay-rich, or decomposing organic material has low resistivity. Dry sand...
- Magnetic susceptibility
- A measure of how strongly a material is magnetised by an external field. Topsoil heated by fire or biological activity has elevated...
- Physical contrast
- The difference in a measurable soil property (density, susceptibility, resistivity, permittivity) between a target and its surrounding host material. No contrast means...
- Signal-to-noise ratio (SNR)
- The ratio of anomaly amplitude to background variation. Pipes, cables, rocks, roots, and instrument drift all add noise. A target is detectable...
Explained in
- Geophysical Survey Principles in Forensic ContextsThe deployment of two or more independent geophysical methods over the same search area. Anomalies confirmed by multiple methods carry higher confidence becaus...