Exploring the effects of curvature and refraction in GIS-based visibility studies

KORMANN, Mariza and LOCK, Gary (2014). Exploring the effects of curvature and refraction in GIS-based visibility studies. In: EARL, Graeme, SLY, Tim, CHRYSANTHI, Angeliki, MURRIETA-FLORES, Patricia, PAPADOPOULOS, Constantinos, ROMANOWSKA, Iza and WHEATLEY, David, (eds.) Archaeology in the digital era : papers from the 40th Annual Conference of Computer Applications and Quantitative Methods in Archaeology (CAA), Southampton, 26-29 March 2012. Amsterdam, Amsterdam University Press, 428-437.

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Abstract

The curvature of the earth affects visibility studies when using a DEM (Digital Elevation Model) and needs to be taken into consideration as pointed out by Conolly and Lake in 2006, although little work has been done in archaeology to explore the implications of this warning. This paper addresses related methodological issues in visibility studies namely the issue of reality, of edge effects, and of significance. We use the long barrows of the Danebury region in England as a case study. New methods to calculate and assess the combined effects of curvature and atmospheric refraction on visibility studies are presented. It is shown that within a visibility range of 10km there is a decrease in visibility of approximately 20% for the Danebury landscape; the effect is larger at areas closer to the horizon.

Item Type: Book Section
Research Institute, Centre or Group: Cultural Communication and Computing Research Institute > Communication and Computing Research Centre
Depositing User: Mariza Kormann
Date Deposited: 15 Jan 2015 11:41
Last Modified: 24 Aug 2015 17:46
URI: http://shura.shu.ac.uk/id/eprint/9040

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