gprMax/community

General space for discussing all things gprMax, GPR, FDTD...

Antonis Giannopoulos

@agianno

@alishir

gorMax will not do this

Ali Shirvani

@alishir

Thanks for your guidance

better1002

@better1002

Could not find conda environment: gprMax
You can list all discoverable environments with conda info --envs.

I have a problem with runninig gprMax

John Hartley

@jasminium

Hello. gprMax has some dependencies. These are installed into a local environment called gprMax using the conda command line tool. First you should install conda then run

Install the environment from the .yml file. The process ocumented here http://docs.gprmax.com/en/latest/include_readme.html. If you have an error please post it here.

better1002

@better1002

I have followed the instructions in the documents, and when I used the "conda activate gprMax", I got the error:

gprMax 3.1.4 is already the active version in easy-install.pth
Installed /home/tony/miniconda3/lib/python3.7/site-packages/gprMax-3.1.4-py3.7-linux-x86_64.egg
Processing dependencies for gprMax==3.1.4
Finished processing dependencies for gprMax==3.1.4
(base) tony@ubuntu:~/gprMax$ conda activate gprMax
Could not find conda environment: gprMax
You can list all discoverable environments with conda info --envs.

(base) tony@ubuntu:~/gprMax$ conda info --envs

conda environments:

#
base * /home/tony/miniconda3

(base) tony@ubuntu:~/gprMax$

John Hartley

@jasminium

try

pip uninstall gprMax

John Hartley

@jasminium

python setup.py cleanall
python setup.py build
python setup.py install

Craig Warren

@craig-warren

@better1002 @jasminium there is an issue with the current conda environment and Windows. We currently have a dependency on OpenBLAS which is not easily installable via conda for Windows. Am looking into ways around it.

Antonis Giannopoulos

@agianno

@craig-warren @jasminium Maybe we should recommend the Windows Subsystem for Linux for Win10?

better1002

@better1002

I get the gprMax from the github again, and problem solved, thanks! @jasminium @craig-warren @agianno

Craig Warren

@craig-warren

I have updated the conda environment file to remove the OpenBLAS dependency. This works on Windows and Linux. However, macOS currently requires a different conda environment file because it does need OpenBLAS as the standard MKL library causes an instability on macOS.

John Hartley

@jasminium

@agianno @craig-warren I have been using Windows Subsystem for some time now and haven't had an any issues. I have not tested the GPU code though

also it could be an idea to provide a docker application?

better1002

@better1002

I want to know how to get the geometry view of my simulation models , what's the command? thanks

Craig Warren

@craig-warren

@better1002 please read the docs, there is plenty of information and examples that show you how to do this - http://docs.gprmax.com/en/latest/output.html#geometry-output

better1002

@better1002

better1002

@better1002

Problem solved,thanks

Alex-VVV

@Alex-VVV

Hi, I see that gprMax supports materials with anisotropic dielectric constants. The use case I am looking at features this kind of anisotropic material, except that its dielectric tensor is a function of space (x,y, and z). Does gprMax support this kind of use case?

Craig Warren

@craig-warren

@Alex-VVV diagonal anisotropy is supported - http://docs.gprmax.com/en/latest/features.html#anisotropic-materials

Alex-VVV

@Alex-VVV

@craig-warren I see that diagonal anisotropy is supported. I guess I wasn’t clear enough, my bad. My material as has a different dielectric constant for the x,y,z direction, so features diagonal anisotropy. My problem is this: those dielectric constants are a function of position. I.e. the value of ε_x at x=0 is not the same as at x=1.

Is this supported?

Craig Warren

@craig-warren

@Alex-VVV it is possible, but not particularly elegant. You would have to define a new material for each new position. Could be done programmatically using Python in the input file, but really depends on how much variation you have as to the number of materials you would need to create.

Siyuan CHEN

@yohanncsy_gitlab

Question for snapshot : I can create many files of images, whose format is .vti, and they will give me a 'video' in paraview. But how can I read the data in every filename.vti ?

bsesasts

@bsesasts

Hello, I would like to ask, if setting the Hertz dipole in gprmax can accurately calculate the specific field strength at a certain distance, why is the theoretical result of my calculation very different from the simulation? I will be very grateful if someone answers

Antonis Giannopoulos

@agianno

@bsesasts Our analytical comparisons with the solution of an infinitesimal dipole are pretty close (http://docs.gprmax.com/en/latest/comparisons_analytical.html) I don't understand why yours are different. Be aware that when you specify the waveform on gprMax for a Hertzian dipole you are specifying the current that runs on this dipole and not a Voltage source gap used to excite that structures of models of real antennas

bsesasts

@bsesasts

@agianno Thank you very much. After the calculation, it has basically conformed to the theory. Previously, I did not have a good understanding of the parameters and calculation of gprmax. Thank you very much.

ZPYBob

@ZPYBob

hi，I use “GPRMAX v3.1.5” software to simulate ground penetrating radar ，i have some questions .

My input file：

domain: 1.5 1.5 0.0015

dx_dy_dz: 0.0015 0.0015 0.0015

time_window: 35e-9

material: 1.0 0 1.0 0 atmosphere

material: 81.0 0.003 1.0 0 fresh_water

material: 12.0 0.004 1.0 0 L1

waveform: ricker 1 800e6 my_ricker

hertzian_dipole: z 0.15 1.3 0 my_ricker

rx: 0.25 1.3 0

src_steps: 0.02 0 0

rx_steps: 0.02 0 0

box: 0 0 0 1.5 1.5 0.0015 atmosphere

box: 0 0 0 1.5 1.3 0.0015 L1

cylinder: 0.7 0.9 0 0.7 0.9 0.0015 0.25 atmosphere

Definition of reflection coefficient：r=(√(ε_1 )-√(ε_2 ))/(√(ε_1 )+√(ε_2 ))-----------（1）；r：Reflection coefficient，ε_1：Relative permittivity of the first dielectric， ε_2：Relative permittivity of the second dielectric。The phase polarity of reflection wave mainly depends on the dielectric constant of the upper and lower layers，When the relative dielectric constant of the upper medium is larger than that of the lower medium, the reflection number is positive, the phase of the reflected wave is positive, which is consistent with the phase of the initial electromagnetic wave, and vice versa.
A shown in the input file：dielectric constant of the background medium ε_1=12，atmosphere ε_2=1。According to the definition formula of reflection coefficient (1)：The electromagnetic wave is projected from the surface to the top of the cavity, that is, the interface between the background medium and the air. Because of 12>1,,the reflection coefficient is r positive, so the phase of the reflected wave is positive, the phase of the reflected wave is not reversed, and it is consistent with the direct wave。For example，The initial phase of visible radar direct wave is positive (red-blue-red), the phase indicated by the blackest arrow in the A-SCAN is consistent with that of the top black arrow in the B-SCAN and the reflection coefficient formula.
At this point, one part of the electromagnetic wave is reflected at the top of the cavity, and the other part continues to propagate downward through the top of the cavity，To the bottom of the cavity, it can be considered as the interface between air and background media.Now atmosphere ε_2=1, dielectric constant of the background medium ε_1=12，Because of 12>1, According to the definition formula of reflection coefficient (1)，The reflection coefficient is negative, and the phase of the reflected wave at the bottom of the cavity should be opposite to that of the direct wave, which is negative (blue-red-blue). However, the phase is visible from the green arrow in figure A-SCAN, the phase is still positive, and the green arrow in the corresponding B-SCAN indicates that the phase is consistent, positive and the phase is not reverse. This is contrary to the reflection coefficient formula. Why?

@craig-warren can you help me?please

Akshay Rathod

@AkshayRathod449_twitter

I have come across a paper regarding tree interior imaging to find whether it is hollow or not. I am trying to implement using sfcw waveform since practically it is more realizable. Can I get some support in simulation before I make hardware? sfcw waveform generation, antenna parameters, bistatic system, B scan, and data processing. I work in a research lab and we look forward to developing the hardware.

1 reply

libowenhit

@libowenhit

Hi, I'm new to gprMax, recently I met a problem that how could I define an arbitrary plate? seems that #plate: can only define surface on the Yee cells. Thanks

Rohan Gupta

@Rohan-cod

I hope everyone is safe and in good health in the wake of prevailing COVID-19.
My name is Rohan Gupta and I am a 3rd-year Computer Science undergraduate student at Shri Mata Vaishno Devi University. I have been working with Python for a couple of years now and have in-depth knowledge of it. I look forward to contributing to gprMax as part of this year's GSoC.
My Linkedin Profile:- https://www.linkedin.com/in/rohang4837b4124/

Dipanshu Gupta

@dipanshug124

Hey, could someone guide me through developer's installation and guide for contribution

Craig Warren

@craig-warren

@Rohan-cod , @dipanshug124 Thanks for the interest. We will be hosting a live webinar in the coming weeks where we will talk and expand upon the ideas in the project list. Meantime you can look at our project ideas list (https://github.com/gprMax/gprMax/blob/master/gsoc/project-ideas-2021.md) and our docs for installing and using gprMax (http://docs.gprmax.com/)

ANUPAM TRIPATHI

@anurocks1

Hi @craig-warren and fellow contributers,

ANUPAM TRIPATHI

@anurocks1

Hope everyone is doing great. I am Anupam Tripathi final year undergraduate at IIT (BHU). I have good knowledge of Electromagnetic physics, python, and machine learning. I would love to contribute to gprMax.

Rashmi Singh

@rashmiprabhat567

Hey @craig-warren , hope you are doing good. I am Rashmi Singh pre final year graduate from Chandigarh University pursuing a general Computer Science branch in B.Tech. I have a keen interest in python and Machine Learning algorithms and did some courses for the same alongside my regular university course. I wanted to be a part of the GSoC community for this organization. I liked the project ideas and I'm willing to contribute to them. Kindly guide me through this as I'm a newbie to this platform. Have a nice day!!

Aaradhya Saxena

@AaradhyaSaxena

Hi @craig-warren, I hope you are doing good. I am Aaradhya Saxena, a final year pg student of Geophysics at IIT Roorkee. Electromagnetic Prospecting is a part of my coursework and I have done internships in Data Science and Software development. I find the project ideas really interesting, and I am looking forward to contributing to the gprMax community.

Kartik Bansal

@karban8

Hi @craig-warren, I want to contribute to this organization. I found the project idea 'Importing geometrical information from laser scanners' quite interesting. will you please help me get started

Craig Warren

@craig-warren

@karban8 the best place to start is to watch the recording of our recent webinar where we provided more info and background to each project idea on our list.

https://youtu.be/trjTAEhfwwc

Moazam

@mzmmoazam

Hi @craig-warren, I am pursuing Masters specialized in Photonics and machine learning for the University of Eastern Finland. I worked as a software developer for sometime before joining the masters. I am proficient in Python and I have experience in simulation and visualization related to wave optics in Matlab and python (e.g.Fresnel, Fraunhofer etc). I found this project very much related to my course and I think I will be able to contribute positively.

Sai Murali Karthik Putcha

@GomaruSai

Hello @agianno, @IraGia, and other contributors! My name is Sai and I am currently in my final year in a Materials Science and Engineering(MSE) Bachelors degree from IIT Indore and I am going to join a masters from September. I am interested in working on photonic materials simulation and project #8: "Modelling complex materials" suits my background and I can get a fundamental understanding of FDTD software in a materials context. I have a good understanding of Electromagnetism from my Astronomy minor and I have also received a job offer in a leading software firm as a software engineering associate. I declined this job offer because I wanted a career in research and this project will act as the right platform for me to enter the field of FDTD and photonic materials simulations. I had sent an email to @agianno and @IraGia with more details about my background and suitability to this project.

Could you please guide me as to how to get started and in framing my proposal? Thanks in advance!

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conda environments:

domain: 1.5 1.5 0.0015

dx_dy_dz: 0.0015 0.0015 0.0015

time_window: 35e-9

material: 1.0 0 1.0 0 atmosphere

material: 81.0 0.003 1.0 0 fresh_water

material: 12.0 0.004 1.0 0 L1

waveform: ricker 1 800e6 my_ricker

hertzian_dipole: z 0.15 1.3 0 my_ricker

rx: 0.25 1.3 0

src_steps: 0.02 0 0

rx_steps: 0.02 0 0

box: 0 0 0 1.5 1.5 0.0015 atmosphere

box: 0 0 0 1.5 1.3 0.0015 L1

cylinder: 0.7 0.9 0 0.7 0.9 0.0015 0.25 atmosphere