plotting geometry about gprmax

[craig-warren]

Hi Sajad, We have done testing with dielectric targets embedded in heterogeneous soils (using the #fractal_box command) and not observed this problem.

Firstly, can you check you are adding the anomaly after the #fractal_box? Secondly, please attach a copy of your input file to this issue, as it will make problem solving much easier.

[SajadJ]

Hello Craig,

Yes, I'm adding the anomaly command (#box) right after #fractal_box command. I was not able to attach the file here, so I'm copying the text below:

---

#title: B-scan from an object buried in a heterogeneous soil
#domain: 0.50 0.220 0.001
#dx_dy_dz: 0.001 0.001 0.001
#time_window: 8e-9
#time_step_limit_type: 2D
#pml_cells: 10 10 0 10 10 0

#material: 6 0 1 0 half_space
#soil_peplinski: 0.4 0.6 2.0 2.66 0.001 0.25 soil_pep
#material: 2.9 1.0 1.0 0.0 plastic

#waveform: ricker 1 1.5e9 my_ricker
#hertzian_dipole: z 0.100 0.170 0 my_ricker
#rx: 0.020 0.20 0
#src_steps: 0.01 0 0
#rx_steps: 0.01 0 0

#fractal_box: 0.0 0.0 0.0 0.50 0.200 0.001 2 1 1 1 10 soil_pep my_fractal_box 2
#box: 0.2 0.1 0.0 0.30 0.150 0.001 plastic

#geometry_view: 0 0 0 0.50 0.2 0.001 0.01 0.01 0.01 plastic f

[craig-warren]

Hi Sajad, There are a few issues with your input file:

• The main problem is with the #geometry_view command. You are using a spatial resolution of 1mm for the model and it is 2D (with 1 cell the z-direction). However, you have requested a 10mm spacing in your #geometry_view which is clearly not possible.
• You probably don't require per-cell-edge geometry information (f option), so use the per-cell (n option) instead.
• Be careful about the positioning of your sources and receivers
• Your plastic material has a conductivity of 1 S/m

When I run your model correcting the #geometry_view command, i.e. #geometry_view: 0 0 0 0.5 0.22 0.001 0.01 0.01 0.001 plastic n, I can see the plastic box in the soil.

[SajadJ]

You are absolutely right! Thank you so much.
Now, it works. The most effective change in this case is f --> n.
Thanks again