Conformal cylindrical properties of Adriatic Sea basin renderings on portolan charts
In: The Cartographic Journal. Maney Publishing: Leeds. ISSN 0008-7041; e-ISSN 1743-2774, more
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| Keywords |
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| Author keywords |
Portolan charts; mapping accuracy; conformal cylindrical projection; Mercator projection; Adriatic Sea |
| Abstract |
The geometry of Adriatic Sea basin renderings on 12 portolan charts made from the late thirteenth to the late sixteenth century was compared to a modern map by applying Helmert transformation in order to preserve their initial geometry and by using the same 40 identical points per chart. In the first stage of the research, the geometry of the portolan charts was compared to six selected map projections in order to determine the geometrical ‘best fit'. In the second stage, networks of lines plotted on charts were divided regionally and functionally and compared to the ‘best fit’ map projection to determine their geometric patterns in more detail. The research results showed that Adriatic Sea basin renderings on portolan charts were probably the result of a deliberately applied map projection which was geometrically most similar to the modern conformal cylindrical (Mercator) projection. |
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