2.10 Spatial analysis
Inverse distance weighted (IDW) interpolation is an efficient method to determines cell values using a linearly weighted combination of a set of sample locations in the study region (Jesudhas et al., 2017 and Johnny et al., 2018). The surface of the study region is interpolated using latitude and longitude of the sample locations (Rostami et al., 2019). The weight is a function of inverse distance and assigned to each location based on distance. The concentration of each water quality parameter is represented in spatial maps using Arc GIS 10.4.