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Le deuxième colloque consacré à l'origine et au développement des cartes portulans, se tiendra à Lisbonne, les 7-8 juin 2018. Un appel à communication a été lancé:ON THE ORIGIN AND EVOLUTION OF PORTOLAN CHARTSLe colloque est organisé par The Interuniversity Centre for the History of Science and Technology (CIUHCT) – Faculty of Sciences, University of Lisbon.Le colloque se tiendra à l'Instituto hidrografico, à Lisbonne.Thèmes abordés :The main objective of the meeting is to bring together as many of the researchers interested in the history of portolan charts as possible. The proposed themes of the workshop are:​ The origin problem: when, where, how and why were the earliest portolan charts constructed? How did the portolan charts evolve over time? How were the medieval portolan charts used in navigation? The mutual influence between the medieval portolan charts and traditional maps of European and non-European origin. The role of multidisciplinary approaches to the research on portolan charts: cartometric methods of analysis, numerical modelling, multispectral analysis, analysis of inks, carbon dating, etc. Any other subject related to the study of the medieval portolan charts.​Calendrier : November 2017: call for papers issued December 31st 2017: deadline for the submission of abstracts January 2018: announcement of accepted papers March 2018: announcement of the programme​Toutes les informations sont disponibles ici.