In another instance of modern technology coming to the aid of medieval heritage, the Archaeological Survey of India (ASI) will be using Ground Penetrating Radar (GPR) to map the contours of the area around the Bagh-e-Naya Qila excavated garden inside the Golconda Fort. It has roped in the Indian Institute of Technology-Madras (IIT-M) to carry out the mapping.
About Bagh-e-Naya Qila:
The Naya Qila garden inside Golconda Fort was built by successive rulers of the Deccan and is one of the few symmetrical gardens extant.
There are strange figures and animals worked out of stone and stucco on the walls of the outer fort facing the Naya Qila.
In 2014, when the ASI excavated the area after diverting the water flow, it discovered water channels, settlement tanks, walkways, fountains, gravity pumps, and a host of other garden relics.
Ground-Penetrating Radar (GPR): Is a geophysical method that uses radar pulses to image the subsurface. This non-destructive method uses electromagnetic radiation in the microwave band (UHF/VHF frequencies) of the radio spectrum and detects the reflected signals from subsurface structures.
Ground Penetrating Radar (GPR) uses a high-frequency radio signal that is transmitted into the ground and reflected signals are returned to the receiver and stored on digital media. The computer measures the time taken for a pulse to travel to and from the target which indicates its depth and location. The reflected signals are interpreted by the system and displayed on the unit’s LCD panel.
GPR can have applications in a variety of media, including rock, soil, ice, fresh water, pavements, and structures. In the right conditions, practitioners can use GPR to detect subsurface objects, changes in material properties, and voids and cracks.