Table 2. Detection changes with buried depth and root size by GPR 250 MHz.

Depth(m) Model-root size(cm) Total capture rate(%)
1.5 2.2 3
0.2 0(0/9) 22.2(2/9) 33.3(3/9) 18.5
0.5 0(0/9) 11.1(1/9) 22.2(2/9) 11.1
0.8 0(0/9) 0(0/9) 22.2(2/9) 7.4
Total capture rate(%) 0(0/27) 11.1(3/27) 25.9(7/27) 12.3