And once again, another awesome video! Thank you for taking the time to create these video's mate, really appreciate them. And yes this did all make sense, but I reckon it is because you taught us this in the course last week 😁
Awesome video. Really good for GPR learner. About the third resolution, space of target horizontally, I think it is more likely depends on the antenna's beamwidth and the object's deep that will affect the footprint of single signal instead of depends on wavelength
I have a general question so thought I would ask here. How do you rate the IDS Detector Duo? Auto calibration scans shallow and deep. But I feel like when I use it. It doesn’t show much. There is no real ways to adjust settings except zoom and resolution. Would be interested in hearing your thoughts. 👌🏼
Thank you for another amazing video. I have a doubt that is not directly related to the video but that it came up while I was studying the subject: I often see the antenna footprint being described as an ellipse. Is the major axis of the ellipse parallel or perpendicular to the dipole? I apologize if the question is silly, but I've been thinking a lot about it.
You have not clearly defined or understood what is resolution. The basic definition of resolution the smallest size element that can be detected. What you have describe are all factors which can affect resolution but they are not in themselves resolution. In the case of smallest distance in which two objects can be differentiated, in the ideal case, vertical resolution is approximately 1/4 the wave length and for lateral resolution is approximately sqrt(depth * wave length/2). However, in practice resolution is affected by pulse dispersion; attenuation; dielectric contrast between the target and surrounding material; the sharpness of the material boundaries; signal to noise ratio and signal clutter, to name a few. A common mistake is to think that more is better. More comes at the expense of production rate. Also, beyond a certain point increasing bits per sample, sample rate (samples per scan), scan rate (scan per metre) or decreasing the line spacing will not improve the resolution. Although, to a small extent scan rate can help improve signal to noise ratio. A complicated topic that deserves a better explanation. Selecting to best parameters for a particular task is no always easy and may require some trial and error, experience, compromise and knowledge.
I wouldn't agree with "needs a better explanation". Maybe more thorough. But I shoved a lot into 15 minutes and said it was a summary. Many have said its helped them alot. And I said in the beginning it's about the size of an object that can be recorded then I said these other points are additional things that I think about when considering resolution.
But like I said, you offer some great additional points and I always appreciate the comments. We actually talk about much of what you add in our intensive training workshops. Looks like you all do some great stuff at gbg Australia. Would love to grab dinner next time or even hit an eels game.
hello sir, thankyou for your videos. It really helped me to understand GPR better. I am an undergraduate geophysics student from Indonesia and currently working on GPR application for laterite exploration using low frequency unshielded antenna. Currently i am having a bit of trouble regarding data processing and data interpretation and would love to discuss this with experienced professionals such as yourself, if you dont mind i would like to know how can i contact you sir?
Velocity in any material equals the velocity on air/square root of rdp. Wavelength is velocity in that material/frequency. We go over this in detail in our workshops
And once again, another awesome video!
Thank you for taking the time to create these video's mate, really appreciate them.
And yes this did all make sense, but I reckon it is because you taught us this in the course last week 😁
My pleasure. It was great catching up. Hopento see you again soon!
Awesome video. Really good for GPR learner. About the third resolution, space of target horizontally, I think it is more likely depends on the antenna's beamwidth and the object's deep that will affect the footprint of single signal instead of depends on wavelength
Thanks for the comment. Great point. Beamwidth or footprint definitely has an effect.
Will a 700 MHz gpr antenna be useful in "Pavement" assessment and "Pavement Layerings" measurement?
I have a general question so thought I would ask here. How do you rate the IDS Detector Duo? Auto calibration scans shallow and deep. But I feel like when I use it. It doesn’t show much. There is no real ways to adjust settings except zoom and resolution. Would be interested in hearing your thoughts. 👌🏼
I think you can get an upgraded software called UNext. You should look into it.
Thank you for another amazing video. I have a doubt that is not directly related to the video but that it came up while I was studying the subject: I often see the antenna footprint being described as an ellipse. Is the major axis of the ellipse parallel or perpendicular to the dipole? I apologize if the question is silly, but I've been thinking a lot about it.
You have not clearly defined or understood what is resolution. The basic definition of resolution the smallest size element that can be detected. What you have describe are all factors which can affect resolution but they are not in themselves resolution. In the case of smallest distance in which two objects can be differentiated, in the ideal case, vertical resolution is approximately 1/4 the wave length and for lateral resolution is approximately sqrt(depth * wave length/2). However, in practice resolution is affected by pulse dispersion; attenuation; dielectric contrast between the target and surrounding material; the sharpness of the material boundaries; signal to noise ratio and signal clutter, to name a few.
A common mistake is to think that more is better. More comes at the expense of production rate. Also, beyond a certain point increasing bits per sample, sample rate (samples per scan), scan rate (scan per metre) or decreasing the line spacing will not improve the resolution. Although, to a small extent scan rate can help improve signal to noise ratio. A complicated topic that deserves a better explanation. Selecting to best parameters for a particular task is no always easy and may require some trial and error, experience, compromise and knowledge.
Good points. You should do a video on this topic.
I would be happy to do a video with you next time you are in town, Val, GBG Australia
I wouldn't agree with "needs a better explanation". Maybe more thorough. But I shoved a lot into 15 minutes and said it was a summary. Many have said its helped them alot. And I said in the beginning it's about the size of an object that can be recorded then I said these other points are additional things that I think about when considering resolution.
But like I said, you offer some great additional points and I always appreciate the comments. We actually talk about much of what you add in our intensive training workshops. Looks like you all do some great stuff at gbg Australia. Would love to grab dinner next time or even hit an eels game.
Can yu send any file or link for identification and differentiation between gasline,waterlines, electrical cables.
hello sir, thankyou for your videos. It really helped me to understand GPR better. I am an undergraduate geophysics student from Indonesia and currently working on GPR application for laterite exploration using low frequency unshielded antenna. Currently i am having a bit of trouble regarding data processing and data interpretation and would love to discuss this with experienced professionals such as yourself, if you dont mind i would like to know how can i contact you sir?
Thanks. Glad the videos are helpful. You can connect with me on LinkedIn?
How to determine pavement thickness by Gpr
How do you estimate wave velocity to then calculate wavelength, for the reasons you describe in this video?
Velocity in any material equals the velocity on air/square root of rdp.
Wavelength is velocity in that material/frequency.
We go over this in detail in our workshops
Can yu make a video on how to find pavement composition determination by gpr
thank u
You are welcome!