Airport Surveying
High-precision surveying for airport projects. El-Eman Office provides precision surveying for major infrastructure.
The Airport Survey Control Network
Every airport project starts by establishing an accurate ground control network tied to the national coordinate system, which then serves as the reference for all later work. The network includes points on both sides of the runway and around the buildings, with protection against damage during construction. It is checked periodically because heavy equipment movement can disturb some of the points.
- Observe the points with dual-frequency GNSS receivers tied to an approved reference.
- Strengthen the network with total station measurements between points.
- Set the point levels by precise levelling rather than GNSS alone.
- Document the points and prepare a description sketch for each one.
Checking Runway and Taxiway Layers
A runway is built in successive layers, from the prepared subgrade to the supporting courses and then concrete or asphalt. Each layer needs a survey check after completion to confirm level, gradient and flatness before the next layer starts. The runway is designed with specific transverse and longitudinal slopes to drain rainwater, so construction must match the design. Surface evenness is also measured with special equipment that detects any undulation that could affect take-off and landing.
Taxiways and aprons need the same care, because aircraft move over them at heavy weights, and any local settlement affects safety and surface life.
Obstacles Around the Airport and Buildings
Aviation regulators define imaginary surfaces around an airport that structures, trees and towers must not penetrate. Surveyors measure every nearby object that could reach these surfaces, record its coordinates and height and compare them with the surface limits. The results go into a report identifying any obstacles that need removal, lowering or warning markings.
- Collect the permitted surface data from the competent authority.
- Survey potential objects with three-dimensional coordinates.
- Compare heights with the surface limits and identify violations.
- Update the survey periodically as trees and neighbouring buildings grow.
Dealing with Soil and Settlement
Airports are often built over large areas where the soil can vary from point to point, causing uneven settlement that affects runway flatness. Weak soil is therefore treated before construction, and levels are monitored during and after construction at regular intervals. If settlement beyond the allowed limits is found, the causes are studied and treated by grouting, re-levelling or other measures, as specialists advise.
Frequently asked questions
Why is higher accuracy required at airports than on ordinary projects?
Because aircraft depend on flat surfaces and precise levels and slopes for safe take-off, landing and drainage, and nearby obstacles can threaten flight operations, so small errors matter.
Are drones used in airport surveying?
They can be used for some tasks, such as photographing site areas and tracking progress, but in and around an airport drones need permits and strict coordination with aviation authorities. Precise level work remains with ground instruments.
What happens after the airport opens?
Survey monitoring continues to detect any settlement in the runway and buildings, to update the obstacle survey, and to document new extensions and record them in the airport database.
