Material εr v Air Ice Fresh water Salt water Dry sand Wet sand Shale and clay Silts Limestone Granite Dry salt 1 3-4 80 80 3-5 20-30 5-20 5-30 4-8 4-6 5-6 0.30 0.16 0.033 0.01 0.15 0.06 0.08 0.07 0.12 0.13 0.13

Table 1: Typical values of some radar parameters for some materials [4].