The canal dug by Xerxes across the Mount Athos peninsula in preparation for his invasion of Greece is an important but little-known monument. Geophysical and topographical investigations begun in 1991–2 now suggest that its central section across high ground ran along a deep trench. Its features elsewhere remain to be determined.
The paper describes the continuation in 1993–4 of the investigation into the Canal of Xerxes in the Chalkidiki, N. Greece. Effort was concentrated in the central sector of the isthmus, where geophysical survey using seismic methods revealed a channel-like structure some 14–15 m below the present ground level. Encouraging support for the hypothesis that this structure is a canal came from the analysis of cores from two boreholes in the central sector: there was a marked discontinuity in the sediments at a depth of c.14.6 m. Radiocarbon dates of some sediments from these boreholes provided useful ancillary information.
Several problems are encountered when collecting traffic information by conventional methods and which leave scope for the development of more comprehensive techniques. This paper reviews the potential of different types of photography as an effective means of obtaining comprehensive traffic information. Comparisons between conventional methods and photographic methods are made. The different types of available photography are discussed, together with their uses in the field of traffic data acquisition. Finally, the paper assesses the use of automatic and semiautomatic methods of photographic data analysis in this context.
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