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  • 1 Károli Gáspár University of the Hungarian Reformed Church H-1088 Budapest, Reviczky u. 4.
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When seeking for the possible emendation of the errors in a map based on Ptolemy's co-ordinates, we have to understand the measuring process of his sources first. Ptolemy possibly used the official formulae provinciae, which were created with the help of gromatic surveys carried out with due precision, but the author had to deal with different formulae, in Pannonia possibly four, which were not consistent with one another. Carefully examining the actual deviations, we can restore the ways and the starting-points of the surveys, and so the methods of eliminating the inconsistencies can be identified.