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Using Empirical Map Projections for Modeling Early Nautical Charts

  • Joaquim AlvesAlves GasparEmail author
Conference paper
Part of the Lecture Notes in Geoinformation and Cartography book series (LNGC, volume 6)

Abstract

A numerical model using the concept of multidimensional scaling, generalized to distances and directions measured on the surface of the Earth, is presented and tested, with the objective of simulating the main geometric features of early nautical charts. Starting with a sample of points defined by their latitudes and longitudes, the process consists in rearranging their positions in a plane so that the differences between the initial (spherical) and final (planar) distances and directions between them are minimized. The geometry of the Cantino planisphere (1502) is simulated and the output is compared with the geographic grid implicit to the original chart, with satisfactory results. The model proved to be an effective and easy-to-use research tool and may be used, not only for simulating and assessing the various factors affecting the geometry of early nautical charts, but also for educational purposes e.g. illustrating the properties of map projections.

Keywords

Indian Ocean Magnetic Declination Angular Distortion Show Line Great Circle Distance 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  1. 1.Centro Interuniversitário de História da Ciência e das Tecnologias (CIUHCT) University of Lisbon, Faculty of SciencesLisbonPortugal

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