5 Need to Know GPR Data Processing Steps

[@zahraomidi5218]

Thank you, Dan. Dewow is actually one of my favorites. 🙂

[@LeonidK8848]

Hi Dan! thank U for your time. But can U will show all this stuff with some (any) software?

[@Learngpr]

Will do. And thanks so much for the suggestion. I do go over this stuff in detail in the GPR BASICS course. There is an hour long lesson on GPR data processing primarily with these steps.

[@jelimearay3543]

Hello Dan!. How can I do topographic corrections? I did the other 5 steps that you comment but I need to correct by topography but I don't know which software could I use or how to do that

[@Learngpr]

Hi Jelime. Thank you for the question. You can use most software packages to make this correction. GPR-Slice, reflex W, Radan, Ekko-project all have topographic correction functionality. Ideally you would need the elevations across the survey profile to make these accurate. GPR-Slice however has a pretty easy function to correct for it if you don't have the elevations. The software allows you to "pull" the data at any given point to macro adjust topography. This works great if you don't have a ton of undulations in the landscape. Hope this helps! Good luck!!

[@jelimearay3543]

LearnGPR thank you very much for your comment. I will try to apply that in reflex or look it in the GPR slices.

[@kazeemolukunle7344]

Hello Dan! This is a very nice presentation. It is very helpful. Thanks.

[@Learngpr]

My pleasure. Thanks for watching!

[@Eselar]

Hi Dan! Thanks for your insights! Did you mention these steps in the order in which they should be applied? Or it doesn't matter which step-sequence we follow?

[@Learngpr]

I generally do, often filters will change gains so i like applying the gains after the filters (or at the same time). I definitely recommend starting with time zero.

[@mosesiheanacho1738]

I'm totally confused about removal of background and horizontal LP -filter. Can you recommend to me the figures I can apply ( delay and window height ns)? Can I send the raw data of what I captured in the field to you?

[@nelzy2001]

Hey Dan! Thanks for all the great content. I'm a grad student learning GPR for archaeological purposes and I was wondering if you could upload a basic tutorial on how to use software like Radexplorer if possible? Thanks so much for your great videos! Your passion is super inspiring :)

[@Learngpr]

Thank you so much! We really appreciate the great comment. Over the past 3 years we have uploaded tutorials for different data processing software which we hope you find helpful!!!

[@austenwhitney5087]

This is gold

[@Learngpr]

Thanks Austen

[@rakeshtayal8646]

Hello Dan, We use Montaj software for the magnetometer data processing. Can i process the GRP data using Montaj sotware??

[@Learngpr]

Rakesh Tayal Hi Rakesh! I haven't used Montaj in a few years but you couldn't process GPR profiles then. But Montaj is an incredibly powerful software for processing 2d plan view maps such as for em induction and magnetometer data sets. So what is possible...is to create GPR time-slices in another program like gpr slice or radan or Ekko project and export as a digital file. then plot those in Montaj and process the time slice data. I have seen some excellent GPR maps created in Montaj. I hope this helps. Let me know if you have any other questions.

[@sangitasingh4665]

Hi..Thanks for the video. I am new to GPR processing and your videos helped me easily understand the basics. Nice work!!

[@Learngpr]

Sangita Singh thanks so much for watching. I'm so glad you found it helpful. I'd be happy to talk to you further about data processing. What kind of system do you use?

[@sangitasingh4665]

I am using GSSI SIR 3000 with low frequency antennas upto15MHz frequency

[@Learngpr]

Sangita Singh got it. Do you use radan?

[@sangitasingh4665]

Yeah RADAN it is...but I use it to study glaciers depth

[@Learngpr]

Thats awesome! Such a cool application. And you get quite deep in the ice. I think for you Topo correction and Migration (not talked about in this video) are going to be key! Do you know how to use Migration in Radan?

[@mosesiheanacho1738]

Thanks for this tutorial on GPR. It is a good one. I will like to have more of this type. Can you recommend to me the best software for processing GPR data with the aim of detecting pipes and cables?

[@Learngpr]

Hi Moses, Thanks for the comment. Which system do you use? We often use Gpr-slice. My company distributes the software. We would be happy to do a demo for you. Let me know.

[@mosesiheanacho1738]

@@Learngpr I use GPR-cobra.

[@niyiakinsunmade4016]

Nice one. Please demonstrate this with software

[@Learngpr]

Niyi Akinsunmade thanks for the request. I plan on doing a few quick guides this year for the channel with different software packages.

[@niyiakinsunmade4016]

Oh. That would be nice. Keep it up bro!

[@Learngpr]

Thanks!! Which software do you use?

[@niyiakinsunmade4016]

Reflexw for now. But hope to try other ones

[@ebrahimsangsefidi2807]

Hi Dan, My question is out of the scope of your video. I am going to evaluate moisture content in the granular materials. Despite doing a vast literature review I am still confused if I can use GPR technology in this regard. Any references, techniques?? I think I may have problems with interpreting the radargram to determine the moisture content at different depth ... Cheers, Ebrahim

[@Learngpr]

Hi Ebrahim, You often can interpret relative differences in moisture content. But, evaluating percentage of water by volume is something that would be very difficult to do. As an aside, I do go over an example of mapping ground water differences in our GPR BASICS course. If you want me to check out a radargram for you just let me know.

[@ebrahimsangsefidi2807]

Thanks Dan, Could you please clarify the definition of the relative difference in moisture content. I thought I can determine the volumetric water content using GPR technology. Although I will check your page regularly, could you please inform me when you launch "mapping groundwater difference" course. Further, I was wondering if you could introduce any relevant references about this issue. Thanks again for your time and your offer to check out my radargram. However, I have not started my fieldwork. Best regards, Ebrahim

[@Learngpr]

sure. When I am talking about relative differences I mean looking at the variation in amplitudes. greater amplitudes will indicate greater differences, often indicating greater water saturation

[@AbhishekVerma-gn3vi]

Hi Dan it's a really good vedio to understand the basics to start. I m using IDS GRED HD for processing. Can u help me with this software setting. I have data from polar ice sheets to process.

[@Learngpr]

Thanks so much! I would love to see some of the data after you have processed it.

[@Learngpr]

Sorry. You asked if i can help. What do you need?

[@AbhishekVerma-gn3vi]

@@Learngpr LearnGPR hi... Can u please give ur email? I will send u the data.. n after process both

[@Learngpr]

[e-mail]

[@puregeophysicist7448]

Can you please send it to me also Thanks 😊 [e-mail]

[@rebwardara7565]

How about Dewow?

[@Learngpr]

Rebwar Nasir also an important filter. Most instruments run a DeWow automatically. It's a vertical filter like the bandpass. Definitely something that should be used if you have a lot of drift and it's not done by the instrument.

[@Learngpr]

Check out this video! kzbin.info/www/bejne/nmbJn4BjnLd4rK8

@@Learngpr Do you know if SIR3000 from GSSI run DeWow automatically? I didn't find anything in the manual. So considering that you need to apply a DC and DeWow filter, would you recommend to do before or after time zero correction. Important to note that, in my case, a gain is recorded in the file header and the first step in my processing chain is to remove that gain.

I also notice that getting the ReflexW to calculate the nominal frequency before and after "remove gain header" gives different values

[@Learngpr]

@ i believe the sir 3000 does a 1d filter in real time. Either a dewow, sc shift or both. When you bring it into reflexw it might import in as raw. That is why it has the vertical striping. Hope this helps

[@rhythmshah]

Migration?

[@Learngpr]

What about it?

[@rhythmshah]

Can you help me out with the variable migration steps and how to implement it?

[@LeacockFelix-h2y]

Lawrence Forest

[@geophysic5830]

forget static and NMO correction

[@muslimaminu1]

Static is time-zero correction

[@JenniferMartinez-z9v]

Jerde Terrace

[@geophysic5830]

migration

[@Learngpr]

If I had a 6th on the list...migration would be it. Thanks for the comment and suggestion.

[@olimpuszeus1310]

dewow