In the longitudinal section, the top information of the anomalous body can be reflected very well at the beginning, and the subsequent inversion steps First Iteration (Horizontal Slice) 200 150 100 50 -50 -100 -150 -200 -250 -400 -200 x (m) Fifth Iteration (Horizontal Slice) 200 150 100 50 -50 -100 -150 -200 -250 -400 -200 x (m) 10th Iteration (Horizontal Slice) 200 150 100 50 -50 -100 -150 -200 -250 -400 -200 x (m) 15th Iteration (Horizontal Slice) 200 150 100 50 -50 -100 -150 -200 -250 -400 -200 x (m) 200 400 (Ω⋅m) 320 300 280 260 240 220 200 180 160 140 120 50 100 150 200 250 300 350 400 450 -400 -200 0 200 400 x (m) FIGURE 13. The prediction model used in the iterative process of ATEM 3D inversion. (Continued) 286 IEEE GEOSCIENCE AND REMOTE SENSING MAGAZINE MARCH 2022 200 400 (Ω⋅m) 340 320 300 280 260 240 220 200 180 50 100 150 200 250 300 350 400 450 -400 -200 0 200 400 x (m) 15th Iteration (Vertical Slice) (Ω⋅m) 350 300 250 200 150 100 50 200 400 300 290 280 270 260 250 240 (Ω⋅m) 50 100 150 200 250 300 350 400 450 -400 -200 0 200 400 x (m) 10th Iteration (Vertical Slice) (Ω⋅m) 350 300 250 200 150 100 50 200 400 (Ω⋅m) 298.5 298 297.5 297 296.5 296 continuously optimize the depth of the anomalous body's bottom interface and the value of the anomalous body's resistivity. 50 100 150 200 250 300 350 400 450 -400 -200 0 200 400 x (m) Fifth Iteration (Vertical Slice) (Ω⋅m) 320 300 280 260 240 220 200 First Iteration (Vertical Slice) (Ω⋅m) 301 300 299 298 297 296 295 y (m) y (m) y (m) y (m) Depth (m) Depth (m) Depth (m) Depth (m)