Geographical variability of environmental parameters versus GPS precision: Toward a better sampling strategy

► A professional GNSS device is necessary to identify spatial environmental variations. ► The number and arrangement of replicates depend on the environment and the parameters concerned. ► The percent of fine fraction shows a high spatial variability over small distances. ► The multiplication of samples is needed to resolve the spatial variability of fine-fraction percent. ► Geochemical parameters show a low spatial variability over small distances.