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Publication Metadata only Effectiveness of different spatial interpolators in estimating heavy metal contamination in shallow groundwater: a case study of arsenic contamination in Hanoi, Vietnam(2011-04) Pham Quy Giang; Kanchana Nakhapakorn; กาญจนา นาคะภากร; Achara Ussawarujikulchai; Mahidol University. Faculty of Environment and Resource Studiesin shallow groundwater, (2) generate risk map and compare effectiveness of different spatial interpolation approaches including Kriging, IDW and Radial Basis Function of Geographic Information System (GIS) in estimating arsenic concentration... and the highest concentration was found in lower aquifer. IDW gave the best prediction with an average error (MAPE) of 32.82%. An arsenic risk map was created from the IDW method. The map showed groundwater arsenic contamination and high contaminated areas