Resumo

LONDONO-CIRO, Libardo Antonio  e  CANON-BARRIGA, Julio Eduardo. Imputation of spatial air quality data using gis-spline and the index of agreement in sparse urban monitoring networks. Rev.fac.ing.univ. Antioquia [online]. 2015, n.76, pp.73-81. ISSN 0120-6230.  https://doi.org/10.17533/udea.redin.n76a09.

This paper presents a procedure to address the lack of spatial air quality data in urban areas, based on the use of Geographic Information Systems (GIS) and spatial interpolation techniques as an alternative to conventional methods of statistical imputation. Two spatial interpolation algorithms are compared: IDW and spline. The procedure considers the spatial interpolation process, the cross validation with the index of agreement (IOA), and the analysis of the effect of sampling density and the coefficient of variation (CVO_i), using different error statistics. The interpolation maps are complemented with gradient and directional gradient maps that may serve as complementary aides in the definition of critical sampling points. The procedure is applied to data imputation of three pollutants NO₂, PM10 (particulate matter of diameter 10 microns) and TSP (total suspended solids) from observed data samples in the city of Medellín (Colombia).

Palavras-chave : Small area estimation and handling missing spatial data; spatial interpolation spline; index of agreement; spatial models; air pollution.

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