Brian Damiata and I put together a quick slice animation of the GPR results from our joint project in Roxbury with the City of Boston. The GPR readings help mapped the subsurface in the yard around the house, therefore the house, carriage house, and dirt pole are in white.   The house is the central white block and the dirt pile extends out  of the carriage house in the southwest.   If you look closely, there are many pipes running east-west.  The block to the north, in the neighbors yard, could show a circular feature that may be a well. The deepth of the slice is listed on the upper left (in cm).  Areas that reflect GPR energy (microwaves) are in red.  Where there was not reflection, the map is blue.  Based on these results  the excavations can be interpreted with better accuracy.