Asian Surveying & Mapping
Breaking News
Government is working towards harnessing space technology for development – Bawumia
Government will soon pass the Ghana Space Policy to...
Chinese satellite propulsion startup secures funding as country’s constellation projects grow
HELSINKI — A Chinese satellite electric propulsion company has...
Hancom to launch S. Korea’s first private satellite for integrated image analysis service
SEOUL -- South Korea's first private satellite for earth...
Israel to invest NIS 600 million in spacetech R&D
The Israel Space Agency and Innovation Authority want to...
China’s iSpace Suffers Third Consecutive Failure of Hyperbola-1 Rocket
Friday the 13th was an unlucky day for Chinese...
ISRO is planning a mission to capture the effects of space weather events on Earth’s atmosphere.
The Indian Space Research Organization (ISRO) has proposed a...
Virgin Orbit to launch Japanese satellite
Virgin Orbit will launch a satellite into space for Japanese...
Plans Unveiled To Better Connect Space Industries In Scotland And The UAE
Edinburgh, Dubai - Globally focused strategic space marketing firm...
UAE, Rwanda sign economic and technical cooperation agreement
Sheikh Shakhboot Bin Nahyan Bin Mubarak Al Nahyan, Minister...
XAG promotes drones in Vietnam to boost rice farming while cutting fertilizer use
CAO LANH, Vietnam - As the monsoon season starts...

June 27th, 2011
Accuracy Check of As-Built Plans for Buried Fibre Optic Lines

As-built plans are prepared and delivered by the contractor at the completion of the job. As built plans confirm the project as it has been actually built, showing any changes that were made from the planned and approved plans. SIEA checks the as-built plans to verify and assess their reliability.  To accomplish this, SIEA personnel survey and record the actual position of the completed work to compare actual location and the submitted as-built plans.  In the process, SIEA produces an accurate reference map for future maintenance and excavation accident prevention.

To start the verification, the as-built plans are downloaded into the EdiPocket software residing on the ProMark 500 rover’s field terminal. The “Measure” menu has a function called “Accuracy Verification” that enables the operator to survey and record the position of the buried line at verification points as the operator follows the covered trench. According to Bruno Forget, SIEA GIS Department manager, most of the current checking is 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 are saved in a Shapefile then transferred to an Excel file, which makes the verification calculation and gives the result as-built plan “accepted” or “rejected.”

SIEA uses 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.

Bruno Forget adds that the ProMark 500 receiver with the software EdiPocket not only saves time for SIEA verification crews, but also increases the reliability and consistency of the entire geographic information system for SIEA.