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A Multivariate spatial interpolation of airborne γ-ray data using the geological constraints

Guastaldi, Enrico and Baldoncini, Marica and Bezzon, Giampietro and Broggini, Carlo and Buso, Giampaolo and Caciolli, Antonio and Carmignani, Luigi and Callegari, Ivan and Colonna, Tommaso and Dule, Kujtim and Fiorentini, Giovanni and Kaçeli Xhixha, Merita and Mantovani, Fabio and Massa, Giovanni and Menegazzo, Roberto and Mou, Liliana and Rossi Alvarez, Carlos and Strati, Virginia and Xhixha, Gerti and Zanon, Alessandro (2013) A Multivariate spatial interpolation of airborne γ-ray data using the geological constraints. Remote Sensing of Environment, Vol. 137 , p. 1-11. ISSN 0034-4257. eISSN 1879-0704. Article.

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DOI: 10.1016/j.rse.2013.05.027

Abstract

In this paper we present maps of K, eU, and eTh abundances of Elba Island (Italy) obtained with a multivariate spatial interpolation of airborne γ-ray data using the constraints of the geologic map. The radiometric measurements were performed by a module of four NaI(Tl) crystals of 16 L mounted on an autogyro. We applied the collocated cokriging (CCoK) as a multivariate estimation method for interpolating the primary under-sampled airborne γ-ray data considering the well-sampled geological information as ancillary variables. A random number has been assigned to each of 73 geological formations identified in the geological map at scale 1:10,000. The non-dependency of the estimated results from the random numbering process has been tested for three distinct models. The experimental cross-semivariograms constructed for radioelement-geology couples show well-defined co-variability structures for both direct and crossed variograms. The high statistical correlations among K, eU, and eTh measurements are confirmed also by the same maximum distance of spatial autocorrelation. Combining the smoothing effects of probabilistic interpolator and the abrupt discontinuities of the geological map, the results show a distinct correlation between the geological formation and radioactivity content. The contour of Mt. Capanne pluton can be distinguished by high K, eU and eTh abundances, while different degrees of radioactivity content identify the tectonic units. A clear anomaly of high K content in the Mt. Calamita promontory confirms the presence of felsic dykes and hydrothermal veins not reported in our geological map. Although we assign a unique number to each geological formation, the method shows that the internal variability of the radiometric data is not biased by the multivariate interpolation.

Item Type:Article
ID Code:9898
Status:Published
Refereed:Yes
Uncontrolled Keywords:Multivariate analysis, airborne γ-ray spectrometry, collocated cokriging interpolator, Elba Island, natural radioactivity, geological constraint
Subjects:Area 04 - Scienze della terra > GEO/02 Geologia stratigrafica e sedimentologica
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Scienze della Natura e del Territorio
Publisher:Elsevier
ISSN:0034-4257
eISSN:1879-0704
Deposited On:23 Jun 2014 11:53

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