Maria Helena Dias, Maria Fernanda Alegria, Colette Cauvin
Information given in ancient maps give rise to interesting problems about methodology that are not always easy to solve.
Two-dimensional regression, which was developed in the 1970s by W. Tobler, is a methodology that allows a comparison to be drawn between cartographic configurations of different periods of time and permits them to be grouped or compared with current maps or even to detect any plagiarism. The example we present is an 18th-century nautical chart of the Lisbon area compared with a current chart and we examine the main methodological problems
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