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In our modern cities there is so much happening below the ground and if one wants to plan a construction venture it is essential to find out whether this is secure not just on the ground. A lot of harm can happen if any kind of unpredicted utility locating gets hit and the effects may not just be finacial but, even worse, can hurt people. Therefore good organisation and secure underground mapping are one of the most important tasks that need to be prepared before the launch of the first works on a constructing area. This means that common utility lines need to be detected and duly marked for the building workers and diggers to evade. And there are many of them, including phone or television lines and all forms of communication and power lines, speaking of the most harmless ones. Then there are the most risky encounters below the ground that need to be treated with the most attention, for example water and gas pipelines, and also oil pipelines can be found; and all of these must be detected with professional underground utility mapping. A further endangerment pose road gullys or water mains, as well as pipes for sewage or gatherings of natural gas. In urban regions, but not exclusively, the room below the ground could be already exhausted by railway tunnels or tunnels for public transport. In order to detect and accurately identify these lines and underground perils several methods can be employed by cartographers. Various sorts of materials used in these public utilities call for various measuring techniques that can detect and locate very exactly all the relevant hazards. Magnetic radars are one possibility, radio detection and ranging combined with GPR are another. In order to get an absolutely exact locating job completed, it is largely unavoidable to utilize all of the different instruments, and it is important to always get the most up to date underground maps done as even beneath the ground things are in a continuous move and often sparsely documented.