What Are High Pass/Low Pass Filters for GPR!

[@josecarlosrodriguesnunes5460]

Excellent class . Thank you very much.

[@Learngpr]

@@josecarlosrodriguesnunes5460 thank you!!

[@bobbyflay2572]

What a huge help. I was assuming "low" meant low and "high meant high and had my values backwards. This helped me clean my processed image up a lot. Thank you !

[@Learngpr]

@@bobbyflay2572 my pleasure!! Good luck!!

[@GeelongCableLocations]

Brilliant!!!! Just love it. Mate, I love how you can break it down and make it so easy for everyone to understand. Can't wait to see the videos you do in 2017

[@Learngpr]

Thanks so much Ben! I really appreciate all the support your have brought through the start of this. Please send me some topics that you want to learn about next year and lets get a date and time on the books for the interview. Dan

[@hassanzare4513]

so good. I'm glad to see your videos.

[@Learngpr]

Thanks Hassan!

[@deltasurvey437]

hi mate ... which GRP is good ? leica d2000 enought to doing for survey work only ? or UTSI , MALA >

[@Learngpr]

delta survey I think leica and mala are both good. The actual equipment that you should use will depend on the application and your experience. I have no experience with UTSI, but I hear great things!

[@mauryapranjal]

Hi Sir, This is really very helpful. Could you please help me with the questions asked below: 1. What is the difference between Bandpass filter and Bandpass Butterworth filter? Which filer should one prefer while processing GPR data? 2. Is there any thumb rule to choose low cut and high cut filter for bandpass or bandpass butterworth? 3. Background filter is a 2D filter which removes horizontal banding. So which filter should be kept above in processing step? Background or bandpass?

[@Learngpr]

Thanks again for the great questions. "Buttersworth" is a function that flattens the data curve in a bandpass filter. I wonder if filters are running this even if it only says bandpass? There are no rules of thumb that I use. It will depend on the antenna frequency, background noise in that particular case, and other potential factors. I often run both at the same time, not prioritizing either one, if I need both (not always the case). If I did run one before the other I would probably run background filter, but that is probably more out of habit than anything else. I'm not sure if one should be prioritized over the other based on the actual math. Hope this helps and thanks again for all of the comments and questions!!