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You are here: Home / Portfolio / Geophysical and Detailed Site Mapping of Cemetery Grounds

Geophysical and Detailed Site Mapping of Cemetery Grounds

portfolio typeCase Historiespdf iconDownload this as PDFPosted on June 22, 2012

EM-61 Metal Detection Map

An EM61 metal detection map (right) indicating presence of potential gravesites.

Challenge

Indiana, like other locations around the world, contains practically innumerable small, privately owned cemeteries, which have relatively long histories, often spanning back to the early days of Indiana statehood in 1816. Mundell was retained by a Cemetery Association to assist them in documenting and accurately marking the existing marked graves (over 450) in one of these cemeteries, using modern surveying techniques, and utilizing geophysical methods for identifying potential unmarked graves, most of which would be presumed to be some of the oldest graves.

Action

Mundell approached the challenge by combining two geophysical techniques. The first, electromagnetic (EM) mapping, was conducted with two instruments: a Geonics EM-61 metal detector, used to characterize the distribution of buried metallic objects, and a Geonics EM-38 terrain conductivity meter, used primarily to quantify variations in soil conductivity due to disturbances in the soil caused by the excavation and backfilling of graves. The second technique consisted of ground penetrating radar (GPR), utilizing a Sensors & Software Nogginplus SmartCart integrated GPR system. After data collection, a GPR mapping program was used to create GPR amplitude depth slice maps at 1-foot (0.3 meter) intervals.

Results

This approach provided value both in terms of preserving the identity and locations of the graves, as well as offering insight into the locations of some unmarked graves. GPR amplitude mapping appeared to have provided the single greatest insight and level of detail pertaining both to graves containing metallic objects (vaults and caskets) and graves retaining little more than disrupted soil strata and human remains. Conductivity mapping with a high resolution conductivity meter such as a Geonics EM-38 combined with gridded GPR mapping appeared to have the best potential combination of methods for mapping unmarked graves.

Publication

Read more about this project from our publication at SAGEEP 2003.

GPR data confirming potential gravesites

GPR data confirming presences of potential gravesites

more information Learn about our related services (Archaeological Studies)

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Our Affiliations

- Midwestern States Environmental Consultants Association
- Environmental & Engineering Geophysical Society
- Professional Geologists of Indiana, Inc.
- National Ground Water Association
- American Societies of Chemical / Civil Engineers Engineers without Borders
- Association of Environmental and Engineering Geologists
- Indiana Association for Environmental Professionals
- Geological Society of American
- Economy of Communion

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