The work was carried out by Esplora in Italy (www.esplorasrl.it) which is an academic spin-off from the University of Trieste, a company focusing on applied research and providing personalized service and non-standard applications. Esplora was founded in 2012 and offers consultancy and survey services in the field of topography, geognostics, geomorphology and geology, to support the design of civil and industrial work.
The project was assigned to Esplora by an Energy Management Company.
The MALÅ MIRA system from Guideline Geo has been used successfully at several different locations around Italy, to map different types of underground utilities and infrastructure.
The MIRA system has been used both by hand and vehicle assisted and the investigations made cover small to larger areas. All surveys aimed to reveal subsurface conditions prior to other measures such as drilling or digging.
For all investigations presented, the work is done with the MiniMIRA (MIRA 8) system; a handy 8 channel
GPR system with 400 MHz separate Tx and Rx antennas. This system gives a channel spacing of 8 cm
and the measurements presented are collected with an 8 cm trace distance. Each trace was 452 samples and stacked 4 times.
Data acquisition was undertaken with MIRASoft, providing simple and straightforward data collection together with
a precise positioning of the measurements. The data is processed and interpreted with rSlicer, a very
easy-to-use software, developed to create detailed images with interpretation of the subsurface and objects in an efficient way. From rSlicer the interpreted results were exported to CAD and GIS tools to create complete underground maps.
When investigating a small town square, the MiniMIRA was hand-pushed without GPS support, due to poor GPS reception. The town square is approximately 40 x 25 meters and the investigation took around 4 hours to carry out. When working without any positioning system the need of a distinct measurement layout is
essential. The positioning data can be created afterwards, to get the correct layout in the post-processing software rSlicer.
The investigation was carried out with a hand towed MiniMIRA without any aid of positioning system in a rather complicated street environment consisting of numerous areas. The investigation area was covered within one field day, with carefully laid out measurement grids and a challenging working environment with heavy city traffic.
The main achievement was that utilities and other underground constructions could be mapped, both efficiently and in high detail, with the MiniMIRA system.