GeoM surveys overhead power lines in Angola
March 2014
News
South African company GeoM has completed an aerial survey project of the overhead power lines in Angola. Using a helicopter mounted high-speed laser scanner, complete with advanced navigation and positioning system, GeoM captured around 1500 kilometres of detailed LiDAR (Light Detection And Ranging) measurements. Complemented with high resolution aerial photography and meteorological data, the laser scanned point cloud will be used by the power company’s engineering department to support maintenance and upgrade programmes.
Africa’s second largest crude oil producer, Angola, recently announced plans to boost power generation fivefold in a bid to attract investment to other industries. The goal is to have an installed capacity of 9000 MW of generation capacity by 2025, compared with a current capacity of about 1800 MW. Angola currently suffers daily power outages and the state wants to double the number of people with access to electricity to 60% in 12 years.
“To support plans to diversify Angola’s economy the country has to be open for business,” comments Dean Polley, CEO of GeoM. “The best way of signalling this intention to the rest of the world is a well maintained energy infrastructure network with approved plans for expansion. By investing in a detailed LiDAR survey, data engineers have up to date and accurate field measurements at their fingertips from which they can make informed decisions.”
GeoM completed the data capture element of the power line survey project in December 2013, using a laser scanner mounted in a specially designed belly pod on the underside of a Eurocopter AS350 B2 helicopter. An advanced navigation and positioning system from IGI including an inertial measuring unit and satellite positioning system ensured the geographical accuracy of the laser scanned measurements. The LiDAR data was complemented with high resolution aerial survey images captured using a 36 Mpixel camera.
Following data processing, GeoM delivered a classified point cloud with an average density of 30 points per square metre, which shows vectored catenary (the curved shape of a chain or cable supported at either end) lines, pylon measurements and colour ortho-photographs with a 5 cm ground resolution. GeoM also provided meteorological data and thermal spot measurements at intervals of 20 kilometres along the line.
For more information contact Dean Polley, GeoM, +27 (0)73 185 5959, [email protected], www.geom.co.za
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