The 2025-26 workshop is in the planning stages. It will begin Dec. 12, and there will be another short background session on Dec. 19. Then we will take a break for the holidays and begin in earnest on January 9, 2026. Please e-mail me here if you are interested in getting the announcements

The workshop is now completed for 2024-25.  It was great, and the participants worked hard, learned much, and we all learned from each other.  I have posted reviews from those who completed the workshop sucessfully and fron previous workshops.
comments from past participants in the Workshop
Those who completed the workshop have now been “promoted’ to accredited advanced GPR interpreters, and they are listed in the Accredited GPR program and included in the maps of the world where all are shown geographically
I am thinking about doing this workshop again next winter starting December, 2025.  Please write Larry Conyers if you are interested, after you have reviewed the format and topics that are recorded below to see what is involved

Videos of the previous workshops:

March 28, 2025:  King Richard III burial
March 21, 2025:  Water Newton: Roman site
March 14, 2025: Cave void space
March 7, 2025: Hollister Site: GPR and magnetics integrated
March 3, 2025: Extracting magnetic values that correspond to GPR
Feb. 28, 2025:  Laetoli prints
Feb. 21, 2025: Hohokam canals #1
Feb. 21, 2025: Hohokam canals #2
Feb. 14, 2025: 3-D from Horizon picking: Late Ice Age Portugal
Feb. 10, 2025: Horizon picking and 3-D image production
Feb. 7, 2025:  Beach deposit with many features on bedrock 
Jan. 31, 2025: Graves
Jan. 29, 2025: Short video of using DOS for GPR processing
Jan. 24, 2025: Migration: Chios, Greece 
Jan. 21, 2025: Radan to Surfer; AI migration with Larry
Jan. 17, 2025: Frequency filtering at Baudes
Jan. 14, 2025: Short video on DOS frequency filtering 
January 10, 2025: Poverty Point: Basic slicing and profile analysis 
Dec. 13, 2024: Resolution of objects and layers
small group session Dec. 9, 2024
Dec. 6, 2024: my take on GPR
Nov. 14, 2024:The basics of slicing
Nov. 7, 2024: introduction to GPR Viewer
Here is my video to all of you on what I will expect prior to that first session together: Oct 27, 2024  
Background sessions for 2022:
https://mediaspace.du.edu/media/t/1_tv7g1tff

https://mediaspace.du.edu/media/Dec.%2015%2C%202020%3A%20Short%20session%20on%20GPR%20Viewer%20and%20Surfer/1_ztyjud89

https://mediaspace.du.edu/media/Amplitude+slicing/1_1zqxorop
The General Sesssions 2022: 

https://mediaspace.du.edu/media/Jan%207%2C%202022%20First%20day%20of%20workshop%E2%80%A6introductions%20and%20where%20we%20are%20going%20with%20Larry%20ideas.%20/1_bmdxuopy


  • Jan 14, 2022:  Ecuador grid and introduction to frequency filtering.


ttps://mediaspace.du.edu/media/Jan%2014%2C%202022%3A%20%20Ecuador%20grid%20and%20introduction%20to%20frequency%20filtering/1_qk40pjsl


  • Jan 21, 2022:  Baudes, France and introduction to Tanuri site (frequency filtering for Roman villa and Medieval church).


https://mediaspace.du.edu/media/Date%3A%20Jan%2021%2C%202022%20Baudes%2C%20France%20%20and%20introduction%20to%20Tanuri%20site%20in%20Arizona/1_ltwxf9of

Jan 28, 2022: Tanuri, Arizona:  a 900 MHz data set in both x and y of a “pre-Classic” Hohokam house.

https://mediaspace.du.edu/media/t/1_f8u6f5rm

Here is a video of the pit house

https://drive.google.com/file/d/1FYa4dNruJ7nuu7JkrHWWqcq9n0Q971f-/view?usp=sharing


  • Feb. 4, 2022: Late Pleistocene Portugal:  mapping fluvial channels in the context of a Late Ice Age hunting site.


Below is the recording of special session on picking the bedrock horizon, and then producing 3-D images of that buried surface, which is a map of the ancient landscape at the end of the Ice Age:

https://mediaspace.du.edu/media/t/1_9y0afwp7

This is the full session where everyone shows their results.  Very interesting mix of methods from many participants. Also an introduction to next week, which is a merger of GPR and magnetics:

https://mediaspace.du.edu/media/Portugal%203-D%20surface/1_85zzaf02


  • Feb 11, 2022: Connecticut USA:  a 17th century farming community that was covered in flood sand about 1705.  Integration of GPR analysis and magnetics.


Below is the short session on merging magnetics and GPR (the “Larry” method of comparing magnetic readings to GPR profiles and amplitude maps, which is very “non traditional”):

https://mediaspace.du.edu/media/Special%20session%20on%20merging%20magnetic%20readings%20and%20GPR%20profiles%20and%20maps/1_x3dn7gse

Here is our group analysis of features from Hollister, with many different data processing and interpretation methods.  With an introduction by Dave Leslie on the recent excavations from the site, which provide an important template forthe interpretations

https://mediaspace.du.edu/media/Hollister%20site%20merging%20GPR%20and%20magnetics/1_1ut2gwxa


  • Feb 18, 2022: Laetoli footprints:  famous Tanzania hominid site with a 2.6 GHZ antenna for very high resolution


a short session on how to process and interpret the prints:

https://mediaspace.du.edu/media/Footprints%20some%20basic%20GPR%20thoughts/1_cv9aysnu

Our joint interpretation of the prints, with many different methods (some good, some not so great…but good tries!) that we used:

https://mediaspace.du.edu/media/GMT20220218-160005_Recording_gallery_3200x1700.mp4/1_874ysok4


  • Feb. 25, 2022: Cueva Peluda Spain:  Neanderthal cave where the ceiling and floor both must be mapped, and the volume of the void space determined.


Some background on methods to pick horizons, convert time to depth and then produce 3-D volumes and images of the cave:

https://mediaspace.du.edu/media/cave%20velocity%20analyses%20and%203-D%20volumes/1_frtwbb3m

Our joint interpretation today of the cave with estimates of the volume.  Also an introduction to the Rillito Fan project for next week

https://mediaspace.du.edu/media/cave%20analysis%20of%20floor%20and%20ceiling%2C%20and%20introduction%20to%20Rillito%20Fan/1_t9pa2ewu

  •  

  • Mar 4, 2022: Rillito Fan, Arizona:  an irrigation system associated with an “Early Agricultural” village on the banks of the Santa Cruz River near Tucson.


short session on placing the canal into space and producing 3-D images

https://mediaspace.du.edu/media/canal%20picks%20and%203-D%20images/1_7r43lv5z

The analysis of the canal, and introduction to the mystery grid

https://mediaspace.du.edu/media/canal%20analysis%20and%20introduction%20to%20mystery%20grid/1_rsjzj11i


  • Mar 11, 2022: The mystery grid. A nice GPR and magnetic grid from a spot in southern England.  The final exam!


Results of the mystery grid analyses

https://mediaspace.du.edu/media/final%20workshop%20day%20with%20results%20of%20the%20mystery%20grid/1_02aeo483

Below are all the recorded sessions for each week of the workshop from 2021:

March 12:  Caves and cave fill.

https://mediaspace.du.edu/media/GMT20210312-155832_Lawrence-C_1920x1200/1_aba3kda9

March 5, 2021:  Arne Andersen Stamnes:  The Norwegian stepped frequency system, and introduction to caves.

https://mediaspace.du.edu/media/GMT20210305-160218_Sala-riuni_1920x1080/1_46oaneq9

Feb. 26, 2021: Graves and gridding complexities.  With Peter Leach from GSSI

https://mediaspace.du.edu/media/Graves+and+gridding+complexities+2.26.21+Speaker/1_fesuo1ay

Feb. 19, 2021:  Footprints/Mystery 1619 grid

https://mediaspace.du.edu/media/GMT20210219-160117_Sala-riuni_1920x1080/1_qov2mxr7

Feb. 12, 2021:  Immo Trinks:  The Austrian multi-channel method

https://mediaspace.du.edu/media/GMT20210212-160404_Pers–nlic_1920x1200/1_kxysro6g

February 5, 2021:  Coopers Ferry 3-D:P how to horizon pick and make 3-D surfaces

https://mediaspace.du.edu/media/GMT20210205-160201_Lawrence-C_1920x1200/1_f88oiwj5

February 3, 2021:  Special session on 3-D profile analysis

https://mediaspace.du.edu/media/GMT20201217-215715_Lawrence-C_1344x728/1_ajl9tj60

Jan. 29, 2021:  Baudes, France and the application of data filtering and migration:

https://mediaspace.du.edu/media/GMT20210129-161447_Lawrence-C_3840x2060/1_jbyktsgl

Jan. 28, 2021:  Special session on profile analysis

https://mediaspace.du.edu/media/GMT20201214-220510_Lawrence-C_1344x728/1_z3zgyp1h

Jan 22, 2021.  Tanuri 2:  Analysis of a Hohokam site in southern Arizona

https://mediaspace.du.edu/media/GMT20210122-155923_Lawrence-C_3528x1200/1_fcy0prct

Jan 18, 2021: migration and filtering and basic slicing

https://mediaspace.du.edu/media/GMT20210118-195948_Lawrence-C_1600x768/1_z26j0mgo

Jan. 15, 2021: Tanuri 1: our start on studying a Hohokam site in southern Arizona:  basic profile analysis and migration

https://mediaspace.du.edu/media/GMT20210115-155752_Lawrence-C_1920x1080/1_sq8au4i1

Dec. 17, 2020: pre-workshop basic amplitude slicing and profile analysis

https://mediaspace.du.edu/media/GMT20201217-215715_Lawrence-C_1344x728/1_ajl9tj60

Dec. 14, 2020: pre-workshop basic GPR

https://mediaspace.du.edu/media/GMT20201214-220510_Lawrence-C_1344x728/1_z3zgyp1h