Data capturing and mapping company GeoM has completed an aerial survey project of overhead power lines in Angola using a helicopter-mounted high-speed laser scanner, says GeoM CEO Dean Polley.
Using a complete advanced navigation and positioning system, GeoM captured around 1 500 km of detailed light detection and ranging (LiDAR) measurements.
Further, 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.
Angola, which is Africa’s second largest crude oil producer, 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 9 000 MW of generation capacity by 2025, compared with a current capacity of about 1 800 MW.
Angola currently suffers daily power outages as the country recovers from a long period of civil war 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’,” says Polley.
“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,” he adds.
GeoM completed the data capture element of the power line survey project in December, 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 Ingenieur-Gesellschaft für Interfaces, including an inertial measuring unit and satellite positioning system, ensured the geographical accuracy of the laser scanned measurements and the LiDAR data was complemented with high resolution aerial survey images captured using a 36 megapixel camera.
Following data processing, GeoM delivered to the client a classified point cloud with an average point density of 30 points for each metre squared vectored catenary (the curved shape of a chain or cable supported at either end) lines and pylon measurements as well as colour ortho-photographs with a 5 cm ground resolution. GeoM also provided meteorological data and thermal spot measurements at intervals of 20 km along the line.