Visualizing the Planimetric Accuracy of Historical Maps with MapAnalyst

Bernhard Jenny · Lorenz Hurni

77 citations0/0 files storedCartographica The International Journal for Geographic Information and Geovisualization

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Historical Geography and Cartography Digital Humanities and Scholarship Geographic Information Systems Studies

Abstract

MapAnalyst is a new software application for the visualization and study of the planimetric accuracy of old maps. It illustrates local map distortion by generating distortion grids, displacement vectors, and new isolines of scale and rotation. MapAnalyst additionally computes the old map's scale and rotation, as well as statistical indicators summarizing the map's geometric accuracy. It offers a user-friendly interface and is freely available for all major computer platforms at . Map historians are invited to use MapAnalyst, and are encouraged to consult and improve the free Java source-code. This article describes the steps leading to visualizations of a map's planimetric accuracy. It provides basic algorithmic information that is necessary for the understanding and correct interpretation of displacement vectors and distortion grids. It also introduces isolines of equal scale and rotation, a new type of accuracy visualization. The last section interprets sample visualizations for an eighteenth century map.

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1994Bidimensional Regression 1977Five centuries of map printing

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2011Positional accuracy, positional uncertainty, and feature change detection in historical maps: Results of an experiment 2014Assessing the Planimetric Accuracy of Historical Maps (Sixteenth to Nineteenth Centuries): New Methods and Potential for Coastal Landscape Reconstruction 2008Cartographic Veracity in Medieval Mapping: Analyzing Geographical Variation in the Gough Map of Great Britain 2016Historical Maps for 3D Digital City's History 2011Georeferencing of Historical Maps Using Back Propagation Artificial Neural Network 2018Comparing historical and contemporary maps - a methodological framework for a cartographic map comparison applied to Swiss maps 2016Computation and visualisation of the accuracy of old maps using differential distortion analysis 2016Cartografia digital geo-histórica: mobilidade urbana de São Paulo de 1877 a 1930

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