Geostatistical modelling of chemical residues on archaeological floors in the presence of barriers

Negre Joan, Munoz Facundo, Lancelotti Carla. 2016. Geostatistical modelling of chemical residues on archaeological floors in the presence of barriers. Journal of Archaeological Science, 70 : 91-101.

https://doi.org/10.1016/j.jas.2016.04.016

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Quartile : Q1, Sujet : ANTHROPOLOGY / Quartile : Q2, Sujet : GEOSCIENCES, MULTIDISCIPLINARY

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Histoire; Histoire, histoire de l'art, archéologie; Géographie-Aménagement-Urbanisme-Architecture

Résumé : Maps representing the distribution of chemical residues over anthropogenic floors are the main diagnostic tools used by archaeologists for addressing the identification of geochemical signatures of past actions. Geostatistics allows producing these maps from a sample of locations by modelling the spatial autocorrelation structure of these kind of phenomena. However, the homogeneity of the prediction regions is a strong assumption in the model. The presence of barriers, such as the inner walls of domestic units, introduces discontinuities in prediction areas. In this paper, we investigate how to incorporate information of a geographical nature into the process of geostatistical prediction. We propose the use of cost-based distances to quantify the correlation between locations, a solution which has proved to be a practical alternative approach for archaeological intrasite analysis. The cost-based approach produces more reliable results avoiding the unrealistic assumption of the homogeneity of the study area. As a working example, a case study of the distribution of two specific chemical signatures in domestic floors is presented within a controlled ethnographical context in Northern Gujarat (India). On a broad disciplinary scale, the benefits of using our approach include improved estimates in regions with complex geometry and lower uncertainty in the kriging predictions.

Mots-clés Agrovoc : résidu, distribution spatiale, modèle mathématique, géostatistiques

Mots-clés géographiques Agrovoc : Inde

Mots-clés complémentaires : résidu chimique, Archéologie, Modélisation mathématique

Mots-clés libres : Cost-based distances, Geostatistics, Spatial heterogeneity

Classification Agris : U10 - Informatique, mathématiques et statistiques

Champ stratégique Cirad : Hors axes (2014-2018)

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