A) Ortho-image of the study area showing drone measurements points. B) Histogram of dose rate data recorded by drone. C) Variogram. D) Ambient Equivalent Dose Rate H*(10) contours map. Red dots: H*(10) measurements recorded by RS200 ionisation chamber. Blue number: H*(10) values measured by RS200. Green number: Identification point at Table 1. E) Cross correlation between dose rate data measured and estimated by kriging spherical interpolation. F) Standard deviation map obtained from kriging spherical interpolation.