Archaeology

- localisation of old cemeteries, hearths, crypts;
- establishing the geometry of old buildings;
- inspection walls and sides;
- establishing the routes of underground corridors;
 

The usage of GPR allows for quick and very precise archaeological surveys. Owing to the application of three-dimensional technology, it is possible to create time slices, that is horizontal sections from any depths.


The GPR is a very sensitive apparatus - using the phenomenon of pulse reflection on physical boundaries differentiated by values of the constant dielectric and electric conductivity. The higher the contrast between the velocity of wave propagation in the surrounding centre, the clearer readout we will obtain. Thus, it is possible to find not only metal objects, but also wooden, stone or clay objects in the ground.

The following examples show some of the applications of the GPR in archaeology.

 

Works carried out in the Church of Blessed Virgin Mary in Poznań brought results in the form of former building plans.

 

Articles in newspaper on the surveying 1, 2

The GPR survey of a desert area surrounding the temple complex of Pachacamac (Lima, Peru). The GPR method proves ideal in the imaging of foundation remains in dry sand.

 

A single 2D profile representing a II World War soldier burial place. It was concluded from the shape of area that it was located in the place marked red on the profile. However, the survey showed that the existing grave is located approximately 2 metres from the anticipated spot. It is visible in the profile as a yellow shape on the left. The depth of the grave is approximately 60 cm.

The example beside presents the survey showing a fragment of an old wall. Owing to the three-dimensional technology, it was possible to obtain horizontal projections showing the shape of the found wall. The survey consists of 16 parallel profiles performed with the 350 MHz frequency antenna.

 

The following example shows an attempt to find a fourteenth century church destroyed in the seventeenth century.


The survey objective was to determine regular shapes or spots indicating the existing church floor. The information obtained from the archaeologist team indicated that church foundations were also taken apart. Thus, it was unnecessary to profile deeper than 2 metres. The survey consists of 30 profiles made with a 200 MHz antenna.


The presented result shows a forest path – the dark line – running vertically and two areas: one at the top – marked with a lighter line and the second on the left side of the path showing a regular shape resembling of a foundation contour. Considering that the distance between profile amounted to as much as 2 m, therefore it is necessary to carry out another more precise survey in to order to determine the geometry of the detected object and to verify the previous survey.


The object at the top – a regular cubicoid - overlaps the excavation, in which the archaeologist team encountered traces of a floor (the white rectangular at the top left side of the profile).