Using GPR to Locate Unmarked Graves Webinar

[@stuartelder7498]

Thank you Greg, that was very insightful

[@deniseadams4121]

I saw multiple plooms like ghostly impressions, with photo, shooting up in the air in a field near to my home. Are they graves? Come check it out?

[@derrhewitt]

Brilliant presentation. Absolutely brilliant.

[@gregjohnston2558]

Thanks. I appreciate your kind words. Sensors & Software is trying to do our part to help.

[@aliffhaiqal1632]

very good video, helps my university assignment a lot. Thank you.

[@jenswinslow1702]

Excellent timely video Greg. Well done. I too am concerned if surveys done will be done to the level necessary for best results.

[@sensoftgpr]

We agree. Thank you for watching the video.

[@kevinsoundmixer]

Fantastic presentation, thank you!

[@waelkhalek5223]

Hi,Dose NOGGIN 250 Adaptable High-Performance Ground Penetrating Radar System 250MHz,can find craves and craves if depth was at 5 meters? Thx

[@rosssmith8481]

I was Kyacking in Chilliwack last weekend and found the ancient burial site, known as the Sumas. Unknown for many years. A local elder said that there are thousands of bodies in this mass grave, because it has been there for hundreds of years.

[@sensoftgpr]

Thank you for watching the webinar! and sharing your story.

[@daymaker5460]

digging holes to bury bodies was not practiced then and there

[@rosssmith8481]

@Daymaker This wasn't unmarked Graves. It was a mass grave. This was caused by all the diseases that came from Mexico, when Cortez first arrived. 200 years before the Mayflower came to Plymouth rock. In British Columbia, it was not uncommon to come across these burial sites. They were usually discovered during construction jobs.

[@lydiabennett7683]

Question, there has been a missing person in ocala fl. I think it's been 5 years... not sure, but if that person was buried would that gpr be able to possibly find the person, the family is still searching and still no answers.

[@DougManifold]

Thank you for an exceptional series of very informative videos. We (Weber State University) have been asked to consider running a GPR survey to locate two WW II atomic bomb loading pits in the desert near West Wendover, UT. They are vertical sided, concert-lined boxes filled with dirt recovered from the general area - should be sandy soil with some silt - very dry. We are told that the local researchers have a fair idea of where to search but not very precise. Any suggestions you might offer about how to go about the field survey would be very much appreciated. Regards

[@sensoftgpr]

Thanks for your kind words. We are glad that you are finding these videos useful. For this particular project, it sounds like a GPR system with an antenna with a center frequency from 100 to 250 MHz would likely be most effective. Ideally, you want to collect data with a tight line spacing to ensure you have crossed over the pits/boxes more than one time to be more confident in your interpretation. Consider running a grid over the area. At 100 MHz, lines should be spaced 1m apart, at 250 MHz, lines should be spaced 0.25m apart. If the area is too large and this detail of data collection is too time consuming, take the approximate diameter of the pit/box, divide by 3 and use that as a line spacing. If you have a system with GPS, rather than setting up a grid, you could also just "mow the lawn" with the GPR, we call this a "pseudo-grid", to cover the area faster. Grids and pseudo-grids allow the data to be processed into depth slices and 3D images which could reveal the pits/boxes as anomalies. I hope that this helps. Good luck!

[@LeviPC13]

Excellent video! Of many I've watched, it's the best on this specific topic. Along the lines of data interpretation, is it necessary to have a GPR software or would QGIS suffice? Since the data is geo-referenced, my hunch is that it could be transposed over an existing map of a cemetery and used to help with interpretation. The existing cemetery map I am working on in QGIS is a georeferenced drone image with layers depicting plots of known and unknown burials. The goal is to further investigate unknown or vacant plots in the old section of the cemetery. Bottom line, what format is the raw data in?

[@metaldetectorsbg2645]

hi there, is the highly mineralized ground a problem for the gpr? i mean like in Australia where the ground is full of iron mineralization. you can put a magnet on the ground and it will stuck with iron dust or magnetite...

[@vincealberta9699]

For the determination of unmarked graves why can't the community do a GPR survey and the result shows say 250 possibly site. Then on those possible 250 possible site conduct a dense grid spacing at a slow speed and in both directions to confirm the site or remove the site from a possible unmarked grave.

[@jerrywright9657]

The cost of precision GPS has dropped substantially in the last few years with the introduction of the U-blox F9P chip. My entire system was under $750 with resolution of 14mm using a free, public RTK base. Depending on where you are, you may need to pay for a commercial RTK base or setup a second unit as a base. Currently working on an abandoned cemetery with 80 years of tree growth and a elevation differential of 25 meters from end to end. Challenging.

[@sensoftgpr]

Thanks for that. Good to know. Good luck on your survey!

[@Tupunaforever]

thankyou

[@fabionlewis864]

Nice video

[@truthhurts5158]

Can you tell whether its an adult grave or a child grave

[@gregjohnston2558]

This can only be done based on the size. It is not easy.

[@truthhurts5158]

@@gregjohnston2558 There is a graveyard by my city has about 23 unmarked graves . Most of them are my relatives, Would be nice to know where they are buried there. My uncle died at less than a year that's why I asked if it could be seen

[@gregjohnston2558]

@@truthhurts5158 To find a small child's coffin, it will be necessary to run a very tight line spacing, as I have suggested in the webinar. If you'd like to continue this conversation, please contact me through our company website: www.sensoft.ca/contact-us-gpr/

[@adanmartinezreyes3296]

Nice thanks

[@sensoftgpr]

Thank you for watching the webinar!

[@decsurvey]

Use the US Survey foot which is the foot divided by tenths, hundreths, and thousandths. Hardware store disliked my US rule as their's goes to 12 and mine goes to 10.