Survey control network
Horizontal and vertical control for construction sites, roads and industrial facilities using static GNSS, traversing and precise levelling.
Licensed service · EL-845/2026
A survey control network is a set of points with precisely known coordinates and elevations, fixed on the ground with permanent markers. Every subsequent task — topographic survey, setting-out, as-built survey and monitoring — starts from these points. If the control is weak, even measurements taken with the best instrument will be wrong.
Control networks are needed on large construction sites, residential complexes, roads and pipelines, industrial plants and for long-term deformation monitoring. When several contractors share one site, a common control network keeps everybody in the same coordinate system and removes mismatches at the interfaces.
Horizontal control is established with SOUTH GNSS receivers in static mode or by total station traversing; vertical control is run with digital levels at ±0.3–1.5 mm/km. Observations are adjusted by least squares, the standard error of each point is computed, and the network is tied to the national coordinate system, WGS-84 or UTM zone 39N.
Markers are installed as concrete benchmarks, wall plates or steel pins in places where they will survive for the life of the project.
When you need it
- At the start of a large construction site or residential complex
- Before road, railway or pipeline construction
- For installing equipment at industrial facilities
- When stable benchmarks are needed for deformation monitoring
- When existing control points are lost or unreliable
What's included
- Network design and selection of point locations
- Installing permanent markers and benchmarks
- Static GNSS sessions or traverse measurements
- Vertical control by differential levelling
- Least-squares adjustment and accuracy assessment
- Tying to the national or local coordinate system
How we work
- Site reconnaissance and search for existing points
- Designing the network layout
- Installing markers and letting them settle
- Field observations (GNSS, total station, level)
- Adjustment, catalogue and report preparation
Deliverables
- Coordinate and elevation catalogue
- Network diagram and marker descriptions
- Adjustment report with accuracy assessment
- Technical report
