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Ashtech simplifies accuracy check of buried fibre optic lines

US: Confirming the accuracy of as-built plans for recently buried fiber optic, gas and electric lines has become much simpler and more efficient with the aid of the Ashtech ProMark 500 GNSS receiver and a new EdiPocket GIS software module, claimed Ashtech. According to the company’s press statement, SIEA, a French association that manages energy, communication, electricity and gas networks for the 419 communes of the Ain department in eastern France, found the innovative new method both simple and efficient, and it expects that it can lead to improved contractor performance.
To start the verification, the as-built plans were downloaded into the EdiPocket software residing on the ProMark 500 rover’s field terminal. The “Measure” menu has a function called “Accuracy Verification” that enabled the operator to survey and record the position of the buried line at verification points as the operator followed the covered trench. According to Bruno Forget, SIEA GIS Department manager, most of the current checking was done on newly laid fibre-optic cables.  A typical fibre-optic trench, filled in just after cable laying, is about 10 cm wide, which is more than adequate for accuracy verification. The positions were saved in a Shapefile then transferred to an Excel file, which made the verification calculation and gave result as-built plan “accepted” or “rejected.”  
SIEA used the Ashtech ProMark 500 receiver, in L1/L2 GPS mode receiving real-time corrections from TERIA, the French GNSS reference station network, and a MobileMapper CX field terminal.  The reliability and ease-of-use of the ProMark 500 rover makes it possible for virtually any operators to perform verification surveys with centimetre-level accuracy in real-time.
Source: Ashtech