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

(512 points in 512 rows) and 256 grey-tones (0 = black, 255 = white). Then the transformation of the digitized photograph was performed by means of some topographical fitting points after which the photograph was superposed on the digitized map (Photo 2). Since only a small part of the aerial photographs contains archaeological information, an appropriate picture-cut was taken. This means enlargement and image-correction, simultaneously. The picture-cuts can be selected on a monitor. During the tests the negatives were examined too. As a final step, the fitted photo-map (see Photo 1) and the corrected positive and negative of the best picture-cut were copied onto 15X24 cm Polaroid photo-paper, by means of a video printer (Photos 3 and 4). The next stage was the interpretation of the pictures (Fig. 1). Our knowledge about the discovered object was further extended by this interpretation. Fig.l Interpretation of the best picture-cut (Photos 3 and 4). The camp may be of two building periods judging from the interpretation. A: the geophysical test site; a: boundary of the polaroid picture; b: one-time road which can be seen on the photo. 1 : calcareous stains appearing sharply, presumably houses and fortress walls; 2: more dimly visible stains suggesting the presence of a building; 3: possible traces of roads. The magnification and fitting procedure described above ensures an accuracy of 15-20 m in the field, as was shown by the unsuccessful excavation performed in 1983 (Fig. 2). Thus, geophysical measurements were needed to localize the rectangle discovered on the airphoto.