ScanTec have the most comprehensive range of equipment available for archaeological surveys in New Zealand. Typically a number of geophysical techniques are employed at an invesitgation site, as correlation of anomalies between different techniques is very important. We have experience in;
- Ground Penetrating Radar - GPR (2D, 3D, time/depth slices)
- Magnetic Surveys (fluxgate, overhauser, proton, cesium vapour)
- Resistivity imaging - multi electrode 2D/3D array
- Electromagnetic surveys (EM-31, EM-34, GEM-300, EM-61)
- Aerial photography. Low-level high resolution digital images. Vertical / oblique
- Sidescan sonar / marine magnetics for marine archaeological projects
- Forward Modeling and 2D-3D Inversion capability for magnetic, EM and resistivity This assists in the interpretation of anomalies. For example, we can determine the theoretical magnetic effect of any buried object in advance, to compare with the actual field observations
Sample output from GSM-19WG magnetic gradiometer
Sample output from GSM-19
Sample output from 3D GPR Survey, showing plan view of GPR grid. Numerous anomalies can be clearly seen which relate to historic draininage lines, foundations, paths and pits
Example of 3D GPR display
Sidescan sonar image of HMNZS Waikato, off the Tutukaka coast. October 2007
ScanTec have performed GPR surveys to assist structural engineers on a number of historic buildings in NZ and Australia. High resolution (1.5GHz) GPR scanning was carried out during restoration of St Patricks Cathedral, Auckland, to investigate the original construction of the arches. As a result of the GPR survey, strengthening of the arches was carried out.
Aerial photography at excavation of three prehistoric Maori sites, Puwewa - South of Whangarei
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Webmaster: M.Watson - matt@scantec.co.nz