History of Geo- and Space Sciences
History of Geo- and Space Sciences
History of Geo- and Space Sciences
Articles | Volume 17, issue 2
Articles | Volume 17, issue 2
https://doi.org/10.5194/hgss-17-83-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hgss-17-83-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 17, issue 2
Article
 | 
07 Sep 2026
Article |  | 07 Sep 2026

Classical antiquity origin of spatial data underlying portolan charts: how Pietro Vesconte might have assembled the Carta Riccardiana utilising maps in Marinus of Tyre's projection

Tome Marelić
Publisher's note: on 12 October 2026, Figure 14 was replaced to correct a typographical error. The letter “E” (East) in the figure was changed to “W” (West).

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Latest update: 18 Oct 2026
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Short summary
The manuscript pesents the first-ever empirical study supported by historcal records which strongly indicates that portolan charts are copies of maps from classical antiquity. Their sub-parts were likely derived from maps in the equidistant cylindrical projection that were graphically adjusted to partially resemble a map in conic projection. It also provides a detailed historical overview of the most significant cartometric studies on portolan charts conducted over the past century and a half.
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