It seems like every week I get a call from someone wanting to located graves in cemeteries

This can be a huge problem both in well marked cemeteries  And older, less well tended cemeteries, where records have been lost and markers moved or destroyed.

Where caskets are still present the graves are very visible as distinct reflection hyperbolas.

When no caskets were used, and remains have disintegrated, often the only clue to the graves are the vertical shafts, which contain different materials than the surround, undisturbed soils.

Profiles are processed in the same way as other GPR studies, and the graves become visible spatially. 

This is a study done on a 19th century Mormon cemetery in Utah

And a historic cemetery from Superior Colorado:

One of the more interesting studies was locating a cemetery of African slaves in Key West Florida.  They were shipwrecked on the island just before the Civil War, and many died of disease.  These poor souls were known to have been buried near the beach, but their exact location was in question.  Since this area was scheduled for development, their descendents were anxious to know the location of the cemetery.   This study was funded by the Mel Fisher Museum.

Data collection was very difficult!  In fact, this was the toughest conditions we have encountered anywhere in the world!   We had to worry about volley ball games getting in our way, getting too sunburned, and being handed too many tropical drinks by the local beach bums!

But the data were great, and the graves were located in profiles, sitting directly on the local "hardpan", which was as far as the grave diggers usually excavated.. 

In map view, they can be seen in orderly rows, just south of the sidewalk.

Here is an article I wrote in Historical Archaeology on this subject.  Click here for a pdf file of it. 

A partial list of the cemeteries studies we have done with GPR:

Leadville, Colorado Hebrew Cemetery

Parker, Colorado Pioneer Cemetery

 Paria, Utah Mormon Cemetery

 San Carlos Prison Cemetery, Pueblo, Colorado 

Wesley Chapel Cemetery, Westminster, Colorado

Key West Florida African Cemetery

Alvarado Pioneer Cemetery, Georgetown Colorado: 

Fort Vancouver Military Cemetery and Hudson Bay Company graveyard, Vancouver, Washington

La Junta Colorado Pioneer Cemetery

Superior Cemetery, Colorado

Lawrence, Kansas Pioneer Cemetery

Rocky Mountain Arsenal Cemetery, Colorado