Search found 96 matches

by 99thpercentile
Sat Feb 20, 2021 3:21 pm
Forum: Near Surface Geophysics
Topic: Good devices to detect Void/graves
Replies: 7
Views: 399

Re: Good devices to detect Void/graves

A depth of penetration of 8 m for a 400 MHz antenna is completely unrealistic. Here is what GSSI says for penetration depths for these antenna frequency ranges. 400 MHz                    0-4 m (0-12 ft)                Utility, Engineering, Environmental, Void Detection 350 MHz HS              0-12 ...
by 99thpercentile
Sat Feb 13, 2021 11:02 pm
Forum: Buy, Sell or Trade
Topic: SIR 3000, 400 MHz antenna and accesories
Replies: 2
Views: 150

Re: SIR 3000, 400 MHz antenna and accesories

I have both of those options available.
by 99thpercentile
Fri Feb 05, 2021 7:58 pm
Forum: Buy, Sell or Trade
Topic: Looking for an old 900Mhz and 200Mhz GSSI antenna
Replies: 1
Views: 336

Re: Looking for an old 900Mhz and 200Mhz GSSI antenna

I have both available, I also have the survey wheels for both.
by 99thpercentile
Fri Feb 05, 2021 7:49 pm
Forum: Buy, Sell or Trade
Topic: Searching for surveywheel/odometer for GSSI SIR-3000
Replies: 4
Views: 1180

Re: Searching for surveywheel/odometer for GSSI SIR-3000

I have one of the GSSI survey wheels available.
by 99thpercentile
Sun Jan 17, 2021 12:31 am
Forum: Near Surface Geophysics
Topic: Profiler 400
Replies: 6
Views: 1348

Re: Profiler 400

Unfortunately, the data collection software for he Profiler is hard coded for the screen resolution of the Recon, which is different that the Archer. The COM port settings are also hard coded for the Recon. I never got the Profiler software to work on any generation of Archer. I did get the software...
by 99thpercentile
Fri Jan 01, 2021 5:12 pm
Forum: Buy, Sell or Trade
Topic: GSSI Antennas for Sale
Replies: 6
Views: 1938

Re: GSSI Antennas for Sale

I didn’t notice this last request. Both antennas were sold almost two years ago.
by 99thpercentile
Fri Jan 01, 2021 4:20 pm
Forum: Near Surface Geophysics
Topic: Locating a man made tunnel
Replies: 28
Views: 11796

Re: Locating a man made tunnel

gopal123


Why did you retype my previous answer in your own words?
by 99thpercentile
Wed Nov 18, 2020 10:42 pm
Forum: Near Surface Geophysics
Topic: Locating a man made tunnel
Replies: 28
Views: 11796

Re: Locating a man made tunnel

Look at the figure I posted above. The tunnel was about 1 m in diameter and approximately 4 m deep to the top of the tunnel.
by 99thpercentile
Sat Aug 08, 2020 5:51 pm
Forum: Near Surface Geophysics
Topic: RIM method
Replies: 5
Views: 1438

Re: RIM method

The RIM method is primarily used for low frequency (kHz to low MHz) crosshole imaging, primarily to detect voids in coal mines before additional mining. They also make an EM gradiometer for detecting shallow conductors. The EM gradiometer system has a passive tunable receiver and can use three diffe...
by 99thpercentile
Fri Aug 07, 2020 1:36 pm
Forum: Near Surface Geophysics
Topic: RIM method
Replies: 5
Views: 1438

Re: RIM method

Stolar Global of Raton, NM, USA does this service and builds their own equipment.
by 99thpercentile
Tue Jun 23, 2020 10:56 pm
Forum: Near Surface Geophysics
Topic: Best GPR for underground utility locating
Replies: 9
Views: 2972

Re: Best GPR for underground utility locating

I have used most of the brands on the market and my current system is the Impulse Radar PinPointR. It uses real time sampling (RTS), operates at both 400 and 800 MHz, and is very compact in size. The price is very competitive at around $16K plus the tablet controller. I am using the Samsung Galaxy T...
by 99thpercentile
Sat Mar 07, 2020 5:40 pm
Forum: Near Surface Geophysics
Topic: Airborne ground penetrating radar
Replies: 16
Views: 14298

Re: Airborne ground penetrating radar

Why do you want to do airborne GPR on a river? I have done tons of geophysical surveys from walking to towing, to real helicopters and planes and also from unmanned aerial systems (UAS). In my opinion towed surveys are the sweet spot for value. Waterborne surveys are just another variation on towed ...
by 99thpercentile
Sat Mar 07, 2020 5:31 pm
Forum: Near Surface Geophysics
Topic: Locating a man made tunnel
Replies: 28
Views: 11796

Re: Locating a man made tunnel

Since it appears that you have more time than money, the target is relatively shallow, and relatively large versus the depth I would suggest electrical resistivity tomography. The DUOYI DY4300B 4-Terminal Earth Ground Resistance and Soil Resistivity Meter costs just over $300 USD for a kit with a re...
by 99thpercentile
Sat Feb 29, 2020 1:21 pm
Forum: Buy, Sell or Trade
Topic: Complete GSSI SIR-4000 GPR System for Sale
Replies: 1
Views: 3607

Re: Complete GSSI SIR-4000 GPR System for Sale

Is there any interest in a complete system like this? What would a good price be for the complete system? Would it be better to break it up into components to sell?

Thanks for any feedback.
by 99thpercentile
Sun Jan 19, 2020 5:17 pm
Forum: Buy, Sell or Trade
Topic: Complete GSSI SIR-4000 GPR System for Sale
Replies: 1
Views: 3607

Complete GSSI SIR-4000 GPR System for Sale

I have a GSSI SIR-4000 GPR controller along with several antennas and number of accessories that I want to sell. I would ideally be able to sell everything as a complete package, but if I can’t get a a reasonable price I might consider breaking some of it up into individual items. The SIR-4000 contr...
by 99thpercentile
Sat Oct 26, 2019 12:58 am
Forum: General Geophysics and Geoscience
Topic: Need a help
Replies: 2
Views: 3148

Re: Need a help

Since you seem to have acquired data from somewhere without a plan on what to do with it, I am going to assume that you don’t have a budget for processing and analysis software. If this assumption is incorrect, then please correct me. If this assumption is correct, then you might want to try Geopsy....
by 99thpercentile
Sat Sep 28, 2019 12:41 pm
Forum: Near Surface Geophysics
Topic: GIS
Replies: 17
Views: 10151

Re: GIS

You are stuck in the middle of a large industrial change. CAD and GIS software were originally designed for very different problem sets with very different needs. These types of software are controlled by two 800 pound gorillas, ESRI and Autodesk, who are on a collision course. Both are converging o...
by 99thpercentile
Sat Sep 28, 2019 12:13 pm
Forum: Near Surface Geophysics
Topic: Use ground penetrating radar with GPS
Replies: 30
Views: 35330

Re: Use ground penetrating radar with GPS

I’m glad you got your GPS working with your GPR. I’m sorry to hear that some manufacturers are still charging extra to use a capability that should be standard in 2019. I had some difficulties a few months ago when attempting to help some users get GPS working with a US Radar Quantum Imager. It was ...
by 99thpercentile
Tue Aug 20, 2019 8:51 am
Forum: Near Surface Geophysics
Topic: Use ground penetrating radar with GPS
Replies: 30
Views: 35330

Re: Use ground penetrating radar with GPS

What specific model of Mala GPR?
by 99thpercentile
Wed May 29, 2019 7:56 am
Forum: Near Surface Geophysics
Topic: gpr-slice demo version
Replies: 2
Views: 1385

Re: gpr-slice demo version

What type of processing and analysis do you need to do? Are you just looking at profiles, or do you need time slices? What brand and model of GPR are you using? Each manufacturer has their own software which usually comes with the purchase of the equipment. If your university has GPR equipment, I ha...
by 99thpercentile
Thu May 09, 2019 10:44 pm
Forum: Near Surface Geophysics
Topic: need advice
Replies: 9
Views: 3103

Re: need advice

I don’t remember the details on that instrument but the founder of the company, Dr. Larry Stolarczyk, patented everything. So I would do a patent search under his name an you should find the details.
by 99thpercentile
Thu May 02, 2019 10:30 am
Forum: Near Surface Geophysics
Topic: need advice
Replies: 9
Views: 3103

Re: need advice

For commercial equipment I am aware of only one company working in this area. Stolar Global Imaging sells and also provides service for coal seam imaging. The system is a wound coil for low frequency radar imaging.

Stolar Global Imaging
http://stolarglobal.com/
Radar Imaging Method(RaiM)
by 99thpercentile
Sun Jul 29, 2018 9:00 pm
Forum: Near Surface Geophysics
Topic: PROBLEM WITH GSSI PROFILER EMP 400
Replies: 8
Views: 17158

Re: PROBLEM WITH GSSI PROFILER EMP 400

I realize that this post was from many years ago, but I was bored while sitting at my desk and waiting for some data processing to complete. I was skimming through old posts and saw this one. There are two problems that occur when you are making geophysical surveys on grids with alternating line dir...
by 99thpercentile
Sat Jun 16, 2018 10:03 pm
Forum: Buy, Sell or Trade
Topic: GSSI Antennas for Sale
Replies: 6
Views: 1938

Re: GSSI Antennas for Sale

USA
by 99thpercentile
Sun Jun 10, 2018 8:22 pm
Forum: Buy, Sell or Trade
Topic: GSSI Antennas for Sale
Replies: 6
Views: 1938

Re: GSSI Antennas for Sale

Both antennas are still available, $3000 each or best offer.