Search found 341 matches
- Mon Jun 08, 2020 10:56 am
- Forum: Near Surface Geophysics
- Topic: Best GPR for underground utility locating
- Replies: 9
- Views: 2650
Re: Best GPR for underground utility locating
RD1500 is cheap and fit certain market requirements, but it's definitely not the best GPR. There have been new models with this new fast stacking tech which is definitely better in penetration depth.
- Sat Jun 06, 2020 10:15 pm
- Forum: General Geophysics and Geoscience
- Topic: Guess geophysics terms (2)
- Replies: 7
- Views: 1846
Re: Guess geophysics terms (2)
Plane wave... 

- Sat Jun 06, 2020 10:13 pm
- Forum: Near Surface Geophysics
- Topic: Pretty neat ground penetrating radar profiles
- Replies: 3
- Views: 1578
- Tue Jun 02, 2020 5:14 pm
- Forum: Near Surface Geophysics
- Topic: Guess what's in the GPR profile
- Replies: 11
- Views: 3205
Re: Guess what's in the GPR profile
The anomaly (4-8m marks)was an underground tunnel. If you look at it carefully, there were some small reflections (hyperbolas) just below its top horizontal layer. I believe they could be beams for a supporting structure inside the tunnel. The long hyperbola was actually a reflection from a pipe ove...
- Mon Jun 01, 2020 6:10 pm
- Forum: General Geophysics and Geoscience
- Topic: Filters used in signal analysis, FIR or IIR?
- Replies: 3
- Views: 1085
Re: Filters used in signal analysis, FIR or IIR?
I have used both FIR and IIR in GPR data processing, I don't see much difference.
- Thu May 28, 2020 5:48 pm
- Forum: Near Surface Geophysics
- Topic: Geovizer.ru help
- Replies: 10
- Views: 1982
Re: Geovizer.ru help
Geophex GEM2 is also an option.
http://www.geophex.com/Product_GEM2_handheld.htm
http://www.geophex.com/Product_GEM2_handheld.htm
- Mon May 25, 2020 7:17 am
- Forum: Near Surface Geophysics
- Topic: Guess what's in the GPR profile
- Replies: 11
- Views: 3205
Re: Guess what's in the GPR profile
No. The antenna was on the ground surface. Usually you need to adjust "time zero" first for GSSI GPR data. Nice data processing.ADobrovolskiy wrote: ↑Mon May 25, 2020 6:19 amyes, now file imported without issues
it seems that antenna was elevated approx 2m above ground? Are you experimenting with drones?
- Mon May 25, 2020 5:58 am
- Forum: Near Surface Geophysics
- Topic: Guess what's in the GPR profile
- Replies: 11
- Views: 3205
Re: Guess what's in the GPR profile
OK, it's probably because it's an exported file and it had a slightly different format. I got the original file this time. Try downloading it again, it should work this time.
- Sun May 24, 2020 7:28 pm
- Forum: Near Surface Geophysics
- Topic: Guess what's in the GPR profile
- Replies: 11
- Views: 3205
Re: Guess what's in the GPR profile
Here is the GPR data file zipped. GSSI 270MHz antenna.
- Sun May 24, 2020 9:31 am
- Forum: Near Surface Geophysics
- Topic: Guess what's in the GPR profile
- Replies: 11
- Views: 3205
Guess what's in the GPR profile
I know it's hard to guess, but it's just for fun. Can you guess what these targets are in the GPR profile? There are two interesting targets here: one is around 30ns in depth and between 4 to 8 meter marks. The other one is the large hyperbola across the whole profile at 40ns and below. GPR guess.jpg
- Tue Aug 13, 2019 8:50 am
- Forum: Near Surface Geophysics
- Topic: Fresh water bathymetry using GPR
- Replies: 4
- Views: 4676
Re: Fresh water bathymetry using GPR
Hi, I would like to share data gathered from the drone using Cobra Plug-In GPR with SE-150 antenna https://drive.google.com/open?id=16lDd2j8RN4BWj3U-LqeLH3ghyMAVC7D8 Flight altitude 3m over water, speed 2 m/s Bottom is visible till 4+ meters 2019-07-15-15-03-37-gpr - processed.jpg Found a video, it...
- Tue Nov 13, 2018 10:53 am
- Forum: Buy, Sell or Trade
- Topic: Mala Geoscience Easy Locator Ground Penetrating Radar System For sale
- Replies: 3
- Views: 1417
Re: Mala Geoscience Easy Locator Ground Penetrating Radar System For sale
Thanks for the warning.
- Mon Sep 07, 2015 9:09 am
- Forum: General Geophysics and Geoscience
- Topic: How to create a model in 3D from 3D data of ERT
- Replies: 1
- Views: 1324
Re: How to create a model in 3D from 3D data of ERT
You can use Paraview. It's a free program and it might take you a while to learn how to do it, but it is actually not that difficult once you are familiar with its concepts.
- Sat Jul 25, 2015 8:03 pm
- Forum: Near Surface Geophysics
- Topic: Difficulty locating concrete sewer
- Replies: 8
- Views: 2726
Re: Difficulty locating concrete sewer
The properties of the concrete and the host soils might be very similar, so you can not see the concrete pipe itself. If this is the case, you are actually looking at voids (the air space inside the concrete sewer). If the sewer pipe is not big in diameter, you probably can't see it clearly in GPR p...
- Sat Jul 04, 2015 6:34 am
- Forum: Near Surface Geophysics
- Topic: GPR processing
- Replies: 23
- Views: 14166
Re: GPR processing
What do you use it for?
- Tue Apr 07, 2015 2:55 pm
- Forum: Near Surface Geophysics
- Topic: Need help to identify anomaly. Void or not!....
- Replies: 7
- Views: 2412
Re: Need help to identify anomaly. Void or not!....
Snow is fine for GPR signals, but you are going to get multiples from ground surfaces which you might think as subsurface layers. When possible, try to collect data with similar amount (thickness) of water and compare the results. I suspect the anomalies are simply caused by the water in the stream ...
- Mon Apr 06, 2015 6:08 pm
- Forum: Near Surface Geophysics
- Topic: Need help to identify anomaly. Void or not!....
- Replies: 7
- Views: 2412
Re: Need help to identify anomaly. Void or not!....
But it also looks like that the anomalies were caused by the water in the stream. I suggest you collect some data on locations nearby and compare the results. I think that the water depth could be too shallow for you to see deep depths because of multiples from the water bottom.
- Mon Apr 06, 2015 5:50 pm
- Forum: Near Surface Geophysics
- Topic: Need help to identify anomaly. Void or not!....
- Replies: 7
- Views: 2412
Re: Need help to identify anomaly. Void or not!....
It looks like it is water filled.
- Sun Apr 05, 2015 8:49 pm
- Forum: Near Surface Geophysics
- Topic: Need help to identify anomaly. Void or not!....
- Replies: 7
- Views: 2412
Re: Need help to identify anomaly. Void or not!....
it does look like a void. The reflection is strong and there is a ringing effect. What kind of gain functions have you used?
- Fri Apr 03, 2015 1:02 pm
- Forum: General Geophysics and Geoscience
- Topic: AML LOCATOR
- Replies: 4
- Views: 1756
Re: AML LOCATOR
I don't know what kind of reviews you want to see, but it seems to me that you still hold some hopes for this scam. Just forget about it, don't waste your money or even time on it.
- Fri Apr 03, 2015 8:07 am
- Forum: General Geophysics and Geoscience
- Topic: AML LOCATOR
- Replies: 4
- Views: 1756
- Sat Mar 21, 2015 12:33 pm
- Forum: Near Surface Geophysics
- Topic: Patent: Merged Ground Penetrating Radar Display for Multiple Antennas
- Replies: 1
- Views: 1011
- Wed Feb 18, 2015 7:51 pm
- Forum: General Geophysics and Geoscience
- Topic: Seismic Unix
- Replies: 9
- Views: 2963
Re: Seismic Unix
I don't know much about seismic unix, but if the size of your data is not large, you can use MATGPR. It's a free program, but you need Matlab installed on your computer. MATGPR has a very nice window interface so it's much easier to use for starters.
- Sat Jan 31, 2015 9:21 am
- Forum: General Geophysics and Geoscience
- Topic: imagen
- Replies: 23
- Views: 5263
Re: imagen
Free program is good for something, depending on what you need...brooker wrote:Yes, but i think free program Is no good
- Fri Jan 30, 2015 4:21 pm
- Forum: General Geophysics and Geoscience
- Topic: imagen
- Replies: 23
- Views: 5263
Re: imagen
That's why I recommended free ones first 
