Earth Resistance for Archaeologists
Earth Resistance for Archaeologists, written by the foremost expert in the field, provides archaeologists with the know-how required to exploit the significant potential of earth resistance methods. A wide variety of possible uses are presented, including cases where earth resistance surveys succeeded in mapping buried archaeological remains that magnetometer surveys were unable to detect. Examples include earth resistance data from many archaeological sites, including in England, Scotland, Nepal, Bangladesh, and more. The archaeological features that can be detected through earth resistance methods are varied, ranging from ditches, pits, and grave cuts to stone and brick foundations, and even include whole landscapes. Whereas area surveys were traditionally the most common earth resistance method, depth profiling and vertical imaging have become well-developed tools that allow electrical depth investigations in three dimensions. Both techniques are described in detail and archaeologists will be able to apply them in their work. Content is equally relevant for environmental investigations.
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Electrical Currents in the Ground
Results from the Homogeneous Ground
The Electrical Signature of Features in the Ground
Implications for Field Practice
apparent resistivity archaeological features archaeological geophysicist archaeological geophysics archaeological prospecting Aspinall basic ERI buried features buried sphere calculated changes conﬁguration contact resistance current density current electrodes current flow current lines data blocks data grids data values display distance earth resistance anomalies earth resistance data earth resistance measurements earth resistance meter earth resistance surveys electrical potential electrical resistivity electrical resistivity tomography electrode array electrode separation equation equipotential lines ERI data ERI proﬁles example ﬁgure ﬁlter ﬁrst ﬂow four electrodes hence High-pass filtering high—resistance anomaly homogeneous ground homogeneous halfspace images inﬂuence interpretation inversion investigation kernel low-pass filter magnetometer measured earth resistance mobile electrodes North Yorkshire parameters plot position possible potential difference processing pseudosection pseudoslices recorded relative electrode remote electrodes resistivity contrast resistivity values Schmidt shows soil sounding curve southern Thornborough henge spatial spike removal surface three—dimensional tion traverses twin-probe data twin-probe ERI twin—probe array variations Wenner array