This video explains how to automate the detection and mapping of hyperbolic reflectors within GPR datasets, and how to map the variation in signal amplitudes for radar traces that fall within the detected hyperbolae. This is particularly useful for mapping rebar in concrete and how to map corrosion of rebar across a site – all remotely, all using ground-penetrating radar.
To purchase GPR-SLICE software, please see here.
Click here to return to the GPR-SLICE help index.
Just a quick blog post this time, but it’s accompanied by a lengthy survey report, which – I am sure – more than makes up for this post’s brevity.
Before I go on: Happy Easter to everyone. I hope you all stay safe and enjoy the long weekend (or holiday, for those lucky enough to get more than the weekend off!).
I have uploaded a copy of the report I wrote for our geophysical survey at the Creswick Cemetery. The survey, of course, sought to detect any unmarked graves in the Cemetery. Ground-penetrating radar (GPR), magnetic gradiometry, electrical resistivity, frequency domain electromagnetics (EM or FDEM) – specifically, ground electrical conductivity – and aerial photograph analyses were thrown at this site and have revealed a great deal of information not only regarding the unmarked graves present, but also of the former Sexton’s cottage and natural soil processes, as well as old geological features such as palaeochannels.
This was a very interesting survey and has yielded some fantastic results. We have also learned a great deal regarding the applicability of various geophysical techniques to the detection of specific types of buried features.
The full report can be downloaded from our website. Note that it is a thirty megabyte file, so it may take some time to download.
Best wishes to all for Easter.
Update: fixed report download link – sorry about that!
Welcome to the fifth incarnation of the Hunter Geophysics website.
I am hoping that this layout will be around for years to come. This new website is powered by WordPress (the blogging software), so allows quick editing of the website. The main reason for changing the website yet again was because it used to take a day of coding just to change one page. Further, the layout and colour scheme were simply terrible in previous designs.
the photograph above each page is of the Tilba District Cemetery, on the southern New South Wales coast (update 3rd April 2016: the photo has since been changed to a photo of the back of our car…)(update 20th April 2019: now it’s a photo of the Smeaton Cemetery in Victoria). Hunter Geophysics were there last week (on the way home from our survey at the nearby Wallaga Lake Aboriginal Cemetery) to inspect the site ahead of a possible survey – here’s hoping that gets approved! (update 3rd April 2016: we didn’t end up getting that gig…). As the Cemetery Secretary said when we were on site, it’s nothing short of paradise.
Speaking of our survey at Wallaga Lake, the attached image shows a towed GPR system comprised of sixteen ground-penetrating radar channels. This allows the collection of sixteen lines of data simultaneously (so surveys are effectively sixteen times faster than with standard single-channel cart-based systems). Brilliant!
David Staveley, author of the geophysics processing freeware ‘Snuffler’, has requested that I make a blog post about ground-penetrating radar and the processing of GPR data, so that’s what is up next in this new blog. But feel free to leave any specific questions or ideas for future posts in the comments section.
Dave “the grave” Hunter