The World Geodetic Surveying System of 1984 (WGS-84) is a mathematical model or an ellipsoid that represents the shape and size of the earth. The WGS-84 ellipsoid has its centre coincident with the centre of gravity of the earth, and is known as an earth centred earth fixed system. WGS-84 has become the international standard for positioning and navigation in aviation
Why conduct a WGS-84 survey?
Reasons why you should do a WGS-84 Survey for your airports:
1. Compliance to the ICAO regulations
2. Movement of the tectonic plate necessitate the WGS-84 being conducted to remain compliant and not compromise on safety
3. Regular check of obstructions around the airport to ensure safety and compliance
4. Calibration of instruments
The WGS-84 survey supports the implementation of the global ATM/cns (Air Traffic Management/ communication, navigation and surveillance) which includes the GNSS (Global Navigation Satellite System) Instrument Approach System.
The contracting states of ICAO agreed that WGS-84 would be implemented by 1 January 1998. This statement appears as standard in the relevant ICAO Annexes.
In view of ICAO’s adoption of the WGS-84 system as the Standard geodetic reference frame, it will be necessary to convert all aeronautical co-ordinate data into the WGS-84 reference system. Many countries have not been able to comply with this requirement; however efforts are ongoing to convert all the required data to WGS-84 as soon as practicable
The Lesolo Engineering survey team, consisting of Registered Surveyors conduct WGS-84 surveys which exceed the minimum accuracy requirements in accordance with the ICAO Annexes 4, 11, 14 and 15 which includes the ICAO DOC 9674-AN9/47 (WGS-84 Manual) and the requirements for TAGGS (Terminal Aeronautical GNSS Geodetic Survey of the National Imagery & Mapping Agency).
• Secondary Airport Control Stations (SACS). These constitute the airport control network
• Runway entities (all runway ends, clear ways, stop ways, thresholds, displaced thresholds, touchdown zones, runway profile points etc)
• Navigation aids (VOR, NDM, DME, VDF etc.)
• Taxi way holding points
• Parking bays
• Instrument Landing Systems (ILS)
• PAPI’s or VASI’s