Search found 21 matches

by merkez
Sun May 25, 2014 6:37 pm
Forum: Near Surface Geophysics
Topic: GPR guess game
Replies: 70
Views: 38218

Re: GPR guess game

Simon wrote:Wow, very nice! So they are bricks? How old are they?
Yep. Stone structural elements actually.. they are dated roughly 500 BC
eric2009 wrote:Great game!
nsm wrote:Thanks for the revelation!
Thanks guys.

I'll be back in a while with a new one. If you also have something interesting to share please don't be shy :lol:
by merkez
Tue Apr 29, 2014 8:00 pm
Forum: Near Surface Geophysics
Topic: GPR guess game
Replies: 70
Views: 38218

Re: GPR guess game

After we extend the limits of the survey, we have found that this place is one of the oldest settlements in the area (dated roughly 500 BC).

Here is the answer and the location of the GPR profile:
location of profile 5
location of profile 5
After survey
After survey
by merkez
Fri Jan 17, 2014 4:45 pm
Forum: Near Surface Geophysics
Topic: GPR guess game
Replies: 70
Views: 38218

Re: GPR guess game

Given the reflection amplitudes in the original data, they should not be metallic objects. If they are only 20 to 30cm wide, they got to be burials for small stuff such as pets. That is correct, they are non-metallic; but they are not burials. Buried columns of an old building? That is kinda close....
by merkez
Sat Jan 11, 2014 6:07 pm
Forum: Near Surface Geophysics
Topic: GPR guess game
Replies: 70
Views: 38218

Re: GPR guess game

OK. Since there are no new answers I am attaching the migrated, filtered and amplitude coded radargrams:
1 Ghz GPR profile (filtered after migration)
1 Ghz GPR profile (filtered after migration)
1 Ghz GPR profile (coded after migration)
1 Ghz GPR profile (coded after migration)
by merkez
Wed Dec 18, 2013 8:06 pm
Forum: Near Surface Geophysics
Topic: GPR guess game
Replies: 70
Views: 38218

Re: GPR guess game

nsm wrote:Good data cleaning. I can see now that there are anomalies every 2 meters at depths about 0.6 to 0.8 meter. They look pretty large. They are not coffins, right?
Very good as usual nsm :)

Not coffins, but you are very close.. almost there :)
by merkez
Wed Dec 18, 2013 2:41 pm
Forum: Near Surface Geophysics
Topic: GPR guess game
Replies: 70
Views: 38218

Re: GPR guess game

I really don't see anything. Probably the resolution is not good enough for what you found? The resolution is actually fine, but in order to see things we all have to process the data carefully :) That's one of the main reasons I put the first radargram here. I am attaching the migrated radargram, ...
by merkez
Sun Dec 15, 2013 9:40 am
Forum: Near Surface Geophysics
Topic: Anyone who has the program reading the JSF format data of the Chirp Sonar data
Replies: 1
Views: 1084

Re: Anyone who has the program reading the JSF format data of the Chirp Sonar data

As a first step, I think you can widen the horizon by converting jsf to a more common format, like seg-y. Then you would have a lot of options ;)

Other than that I can say HYPACK is very good.
by merkez
Sun Dec 15, 2013 9:25 am
Forum: Near Surface Geophysics
Topic: Teachers consider what is the best system for finding treasure?
Replies: 12
Views: 2587

Re: Teachers consider what is the best system for finding treasure?

For harsh working conditions Usradar is perfect. They have shielded antennas and easy to use: http://www.usradar.com Nearest distributor to Iran is Turkey: http://www.yeraltiradari.com Depending the geology you would need 200-250 Mhz antennas. Thank you for your response But I read on this website....
by merkez
Sun Dec 15, 2013 9:11 am
Forum: Near Surface Geophysics
Topic: GPR guess game
Replies: 70
Views: 38218

Re: GPR guess game

I thought you said you didn't find anything. No, I said "we did the survey"; all i said was "the company who owns the place was insisting there is nothing in there".. We found a lot of stuff buried in the area, and the radargram actually shows some of them :) It is really hard to see; that is why I...
by merkez
Sat Dec 14, 2013 7:05 pm
Forum: Near Surface Geophysics
Topic: GPR guess game
Replies: 70
Views: 38218

Re: GPR guess game

Anyone to guess?

:)
by merkez
Sat Dec 14, 2013 7:03 pm
Forum: Near Surface Geophysics
Topic: Teachers consider what is the best system for finding treasure?
Replies: 12
Views: 2587

Re: Teachers consider what is the best system for finding treasure?

For harsh working conditions Usradar is perfect. They have shielded antennas and easy to use: http://www.usradar.com
Nearest distributor to Iran is Turkey: http://www.yeraltiradari.com

Depending the geology you would need 200-250 Mhz antennas.
by merkez
Sun Dec 08, 2013 4:28 pm
Forum: Near Surface Geophysics
Topic: Sub bottom profiler
Replies: 63
Views: 73638

Re: Sub bottom profiler

Try the subbottom system of Meridata (http://www.meridata.fi). They integrate different sound sources in a single system and the results are very good. I have one since 2000 and just upgraded it. You can choose up to 4 different sound sources (chirp, side scan, boomer, sparker), in a single system ...
by merkez
Sun Dec 08, 2013 4:16 pm
Forum: Near Surface Geophysics
Topic: GPR guess game
Replies: 70
Views: 38218

Re: GPR guess game

I did some surveys looking for graves where the clients actually didn't want me to find anything. But I always found some :oops: It's good for the construction company that you didn't find anything causing concerns. I didn't say we found anything :) Actually that's why I put the radargram here.. It...
by merkez
Sun Dec 08, 2013 6:58 am
Forum: Near Surface Geophysics
Topic: GPR guess game
Replies: 70
Views: 38218

Re: GPR guess game

Were you looking for something with the GPR survey? Aren't we all looking for something ? :) Yes. The area was small site (approximately 20x20m) and a company was planning to construct a new building; they bought the land some time ago. However, local bureau of cultural heritage preservation notice...
by merkez
Sat Dec 07, 2013 11:03 am
Forum: Near Surface Geophysics
Topic: GPR guess game
Replies: 70
Views: 38218

Re: GPR guess game

topgpr wrote:The wave velocity is so high, it should be sand or something similar.
That is correct..
There is only a thin layer of concrete on top (pathway), other than that it is loose geology. Mostly sand + sandstones + little bit of clay after 0.20-0.25 cm depth.
by merkez
Fri Dec 06, 2013 9:12 pm
Forum: Near Surface Geophysics
Topic: GPR guess game
Replies: 70
Views: 38218

Re: GPR guess game

I think it has been a while since the last game.. :) I am here again with this: tespit_12_1.jpg GPR data is collected with a USRADAR 1 Ghz shielded antenna in an urban area. V= 0.15 m/ns according to in-situ measurements. I would like to hear your thoughts about this challenging radargram :) If you ...
by merkez
Sun Oct 31, 2010 12:37 pm
Forum: Near Surface Geophysics
Topic: GPR guess game
Replies: 70
Views: 38218

Re: GPR guess game

So the reflections (at least the top ones) are probably from these iron bars. This makes sense, these reflections are so clean and strong, look like signals from metals instead of concrete. Yes, exactly. These clean anomalies sourced from metal and they are much more stronger than concrete, as expe...
by merkez
Sat Oct 30, 2010 8:07 pm
Forum: Near Surface Geophysics
Topic: GPR guess game
Replies: 70
Views: 38218

Re: GPR guess game

I looked at the radargram again, the double or triple reflections from each concrete wall are actually not centered at the same location, there were slight shifts among the reflections. I guess there might be something else on top of the walls, or the top of each wall has certain shape giving 2 or ...
by merkez
Tue Oct 26, 2010 5:48 am
Forum: Near Surface Geophysics
Topic: GPR guess game
Replies: 70
Views: 38218

Re: GPR guess game

Hi guys. It has been fun to read comments and most of you were really close to the answer :) This profile data has been collected in a "very" old industrial site, abondened in 80's and now they will build a new theme park on it. What you have been looking was a GPR profile, collected inside just one...
by merkez
Tue Aug 17, 2010 8:09 am
Forum: Near Surface Geophysics
Topic: GPR guess game
Replies: 70
Views: 38218

Re: GPR guess game

I did an approximate calculation based on the shape of the hyperbolas. Suppose the depth on the radargram is right and the hyperbolas represent pipes, the diameter of each pipe is about 20 meters, much more than their spacing. This doesn't look right so they should not be pipes. nsm, you are an exc...
by merkez
Mon Aug 16, 2010 5:09 am
Forum: Near Surface Geophysics
Topic: GPR guess game
Replies: 70
Views: 38218

GPR guess game

Hi there,
The attached GPR profile is collected with a 500Mhz antenna.

Can anyone guess the buried structures?

You know, just for fun :)