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Accurately Estimating Vessel Volume from Profile Illustrations

Published online by Cambridge University Press:  20 January 2017

Louise M. Senior
Affiliation:
Department of Anthropology, University of Arizona, Tucson, AZ 85721
Dunbar P. Birnie III III
Affiliation:
Department of Materials Science and Engineering, University of Arizona, Tucson, AZ 85721

Abstract

The highly fragmented nature of most archaeological ceramic assemblages makes whole or reconstructible vessels valuable and rare finds. Vessel volume has rarely been systematically quantified because convenient reconstruction methods dealing with sherds and partial vessels have been lacking. Now, with the method presented in this paper, highly accurate volumetric capacities of fragmented vessels can be calculated from carefully prepared vessel profile illustrations. The profile is digitized using a small number of points per vessel (20 to 30 points are usually sufficient). These data are then converted to a volumetric measure using a computerized algorithm based on the geometry of stacked bevel-walled cylinders. This method of determining vessel volumes was tested and shown to be highly repeatable and accurate. Quantifiable sources of error are generally limited to less than one percent per vessel, with the final accuracy limited chiefly by the quality of illustration. With this computerized technique, fragmented vessels no longer need to be fully reconstructed in order to obtain volumetric information.

Resumen

Resumen

Los hallazgos de vasijas completas o reconstruibles son muy raros debido a la gran fragmentación de la mayorίa de los conjuntos cerámicos arqueológicos. El volumen de las vasijas no ha sido cuantificado sistemáticamente debido a la falta de máetodos adecuados que utilicen vasijas parciales o fragmentos de éstas mismas. Ahora, con el método presentado en este reporte, capacidades volumétricas exactas pueden ser calculadas para vasijas parciales o fragmentadas utilizando ilustraciones cuidadosas de los perfiles de las vasijas. El perfil es digitalizado usando pocos puntos para cada perfil (20 o 30 puntos son usualmente suficientes). Los datos son convertidos a un estimado de capacidad volumétrica usando un algoritmo computarizado que se basa en la geometrίa de cilindros con paredes inclinadas, montados uno encima de otro. Este método de determinación de volúmenes de vasijas ha sido puesto a prueba; el método es preciso y exacto. Fuentes de error cuantificable son limitadas a menos del uno por ciento por vasija, con la exactitud final dependiente, en su mayor parte, de la calidad de la ilustración del perfil de la vasija. Con esta técnica computarizada, la vasijas fragmentadas no necesitan ser completamente reconstruidas con el propósito de obtener información volumétrica.

Information

Type
Reports
Copyright
Copyright © The Society for American Archaeology 1995

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