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GIS-Based Image Enhancement of Conductivity and Magnetic Susceptibility Data from Ureturituri Pa and Fort Resolution, New Zealand

Published online by Cambridge University Press:  20 January 2017

Thegn N. Ladefoged ,
Sheena M. McLachlan ,
Sarah C. L. Ross ,
Peter J. Sheppard  and
Douglas G. Sutton
Thegn N. Ladefoged
Affiliation:
Department of Anthropology, University of Auckland, Auckland, New Zealand
Sheena M. McLachlan
Affiliation:
Department of Anthropology, University of Auckland, Auckland, New Zealand
Sarah C. L. Ross
Affiliation:
Department of Anthropology, University of Auckland, Auckland, New Zealand
Peter J. Sheppard
Affiliation:
Department of Anthropology, University of Auckland, Auckland, New Zealand
Douglas G. Sutton
Affiliation:
Department of Anthropology, University of Auckland, Auckland, New Zealand
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Abstract

Two geographic information system (GIS) techniques for displaying, analyzing, and interpreting geophysical data were recently applied at two archaeological sites in northern New Zealand; a pre-European Maori pa (fortification), and a late nineteenth-century European fortification. A GIS was used to stretch and filter the conductivity data from the pa to accentuate subtle contrasts and clearly delineate boundaries between areas with contrasting conductivity readings. Magnetic susceptibility data and two different bands of conductivity data from the historic fort were used as input for a GIS-based unsupervised classification. The classification delineated five spatial entities, several of which corresponded to known archaeological features. The interpretability of the geophysical data in relation to conventional visual analysis of conductivity contour maps was enhanced through the use of the GIS procedures outlined.

Resumen

Resumen

Dos técnicas de sistema de información geográfica (GIS) para representor graficamente, analizar, e interpretar datos geofisicos fueron aplicadas recientemente a dos sitios arqueológicos en el norte de Nueva Zelandia; un pa (fortiflcación) Maori pre-europeo y una fortiflcación europea de final del siglo diez y nueve. GIS se utilizó para expandir y filtrar los datos de conductividad del pa con el propósito de acentuar los contrastes sutiles y delinear claramente los limites entre las áreas con lecturas de conductividad contrastantes. Los datos de susceptibilidad magnética y aquéllos de dos bandas distintas de conductividad del fuerte histórico fueron utilizados como base para una clasificación no supervisada basada en GIS. La clasificación delineó cinco entidades espaciales, algunas de las cuales corresponden a rasgos arqueológicos conocidos. El potencial interpretativo de los datos geofisicos en relación con análisis convencionales de mapas de contorno de conductividad fue mejorado a través del uso de estos procedimientos de GIS.

Type
Reports
Information
American Antiquity , Volume 60 , Issue 3 , July 1995 , pp. 471 - 481
Copyright
Copyright © The Society for American Archaeology 1995

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