Average variance in soil conductivity in the decade up to 2006. 

Original data source: Apps H.E., Cullen K., Halas L., Tan K.P., Pain C., Clarke J.D., Lawrie K.L., Gibson D., Brodie R.C., Wong V. (2009) River Murray Corridor Victorian AEM Mapping Project. Geoscience Australia, Canberra, ACT.

Georeferenced by Kevin Davies, UTS