How Airport Obstruction Surveys Protect Flight Safety
Every structure built near an airport, a new building, a communication tower, even tall trees, must be checked against precisely defined height limits that protect aircraft during takeoff and landing. Airport obstruction surveys map these limits and verify compliance before construction proceeds.
4+
Distinct obstacle limitation surfaces defined
15 km
Extent of some obstruction surfaces from runway
1cm
Height measurement precision required
100%
Compliance required before certain construction
Understanding Obstacle Limitation Surfaces
Invisible surfaces in the sky define the limits
International aviation standards define a series of imaginary sloped surfaces extending outward and upward from the runway, the approach surface, transitional surface, and others. Any structure penetrating these surfaces is considered an obstruction requiring mitigation or removal.
What an Obstruction Survey Involves
DGPS and drone survey establishes the exact three-dimensional position and height of every existing structure in the study area.">
1
Height Data Collection
2
Surface Calculation
3
Compliance Check
4
Obstruction Reporting
Precise height measurement of every structure near an airport confirms compliance with strict aviation safety surfaces.
Who Needs This Survey
| Stakeholder | Reason for Obstruction Survey |
|---|---|
| New building developers near airports | Confirm proposed height stays within legal limits |
| Communication tower operators | Verify placement does not create aviation hazard |
| Airport authorities | Periodic monitoring of surrounding development compliance |
How far from an airport does this restriction apply?
Distance varies by surface type and airport classification, but approach surfaces in particular can extend many kilometres from the runway threshold, meaning distant structures may still be affected and should be checked before construction.
If your project is located anywhere near airport approach paths, an obstruction survey should be completed before finalizing building height design. Learn more about our urban planning survey services.
Get a Same-Day Quote on WhatsApp Back to all articles