M. Járó - L. Költő szerk.: Archaeometrical research in Hungary (Budapest, 1988)

Prospecting - ERDÉLYI Balázs, PATTANGYUS-Á. Miklós: Computer image processing and soil resistivity survey of an archaeological site discovered by aerial photography

3. Geophysical measurements and their interpretation On the basis of the aerial photograph fitted onto the topographic map, an area of 50X 30 m was selected in the NE comer of the rectangular object for geophysical measurements (Fig. 2). Shallow depth, direct current resistivity measurement was chosen as the measuring method in the hope that the disturbances caused by an assumed earthwork and by the possible debris would result in a suitably interprétable anomaly. Since geoelectric measurements are direction dependent as far as the electrode array is concerned, bidirectional measurement was performed with certain overlapping, using the dipole-dipole array, for the better detection of the objects meeting almost orthogonally at the comer (Fig. 2). The position of the comer assumed from the airphoto, the site of the archaeological trench and the expectable place of the earthwork interpreted on the basis of the maps of Figs. 3,4 and 5 are also illustrated in Fig. 2. \ 0 5 10m . . , j Fig. 2 Location map of the geophysical measurements, a: boundary of the resistivity measurements and the layout direction; b: archaeological trench located in 1981 on the basis of the airphoto; c : magnified picture of the NE corner of the rectangle which can be seen on the airphoto. The characteristics of the airphoto with an original scale of 1:15,000 can be localized in the field with an accuracy of 15-20 m, à: the one-time road which can be seen on the airphoto and which can be marked out in the field relatively accurately by other landmarks; e: line of the earthwork interpreted from the geophysical measurements.