GNSS vs Total Station: Which to Choose for an Industrial Site

The question “GNSS or total station?” comes up when planning almost any field assignment. Each method has situations where it performs best — and situations where it simply will not work. Below we examine both instruments in the context of typical tasks on industrial sites in Kazakhstan.

How GNSS Survey (RTK) Works

A GNSS receiver (GPS/GLONASS) determines its position by receiving signals from satellites. In RTK (Real-Time Kinematic) mode, a base station set up over a point with known coordinates transmits real-time corrections to the rover. This delivers positional accuracy of 2–3 cm in plan and 3–5 cm in height.

Modern receivers — for example, the Trimble R12i and Leica GS18 in our fleet — also incorporate IMU (inertial measurement unit) technology, which allows points to be recorded at any antenna tilt and even during brief signal loss.

Productivity: an experienced surveyor with an RTK receiver records 400–600 points per day on open terrain; 200–300 on complex terrain.

How a Total Station Works

A total station is an electronic theodolite with a built-in distance meter. The instrument is set up over a known point, oriented to a reference direction, and measures horizontal and vertical angles plus the distance to a reflector (prism). Point coordinates are calculated trigonometrically.

The accuracy of a modern total station is 1–5 mm in plan when working within 200–300 m. The Leica TS16 and Trimble S7 that we use are also equipped with reflectorless EDM mode: points can be measured without a prism — for example, a building corner or the edge of a structure — to 3–5 mm accuracy up to 300 m.

Productivity: 150–250 points per day in dense built-up areas working with a prism; faster for reflectorless measurement of simple outlines.

Comparison: When to Choose What

Criterion	GNSS (RTK)	Total Station
Planimetric accuracy	2–3 cm	1–5 mm
Height accuracy	3–5 cm	2–5 mm
Productivity	High (400–600 pts/day)	Lower (150–250 pts/day)
Open terrain	Excellent	Good
Under roof / inside buildings	Does not work	Excellent
Dense urban environment	Limited	Excellent
Near tall structures	Limited	Excellent
Large areas (>10 ha)	More cost-effective	More expensive
Small areas (<1 ha)	Overkill	Optimal
Set-out work	Possible	Preferred
As-built survey of utility networks	Limited	Optimal

When to Choose GNSS

Large open areas. Topographic survey of steppe terrain, farmland, pipeline routes, and drilling pad sites — GNSS outpaces a total station by a factor of 3–4 in productivity. On a 50-hectare site an RTK receiver completes the work in 1–2 days; a total station would take 5–7.

Set-out of linear features. Chainage marking for a pipeline or road alignment of 10+ km is completed in one day with GNSS. Moving a total station every 300 m would take a week.

Geodetic control for drilling operations. Determining wellhead coordinates, tying geological sample points, surveying cluster pads — tasks where centimetre-level GNSS accuracy is fully adequate.

Deformation monitoring on large facilities. A network of GNSS sensors on a field provides continuous data without a surveyor in the field.

When to Choose a Total Station

Industrial workshops and enclosed structures. Inside an oil storage tank, pump station, or production building, GNSS simply does not function — a total station is the only option.

Constrained urban conditions. As-built surveys in the dense built-up areas of Aktau, where the sky is obscured by multi-storey buildings, are performed with a total station. GNSS in such conditions produces an unstable signal and degraded accuracy.

Set-out of structures to millimetre accuracy. Marking out building axes, setting out foundations, installing process equipment — tasks requiring 3–10 mm accuracy. GNSS is not precise enough for these.

As-built survey of utility networks. Recording heat mains, water mains, and cable ducts in trenches where satellite signal is unreliable is classic total-station work.

Transferring points to inaccessible locations. When a point must be set out beneath an overhanging structure or into a confined space, a reflectorless total station is indispensable.

When Both Methods Are Needed Together

On large industrial sites we regularly operate both instruments in parallel.

Typical workflow: GNSS establishes an extended control network across the open areas of the site in one day. The total station then uses those control points to carry out detailed survey of production buildings, pipe racks, and pipework. The result is maximum accuracy where it matters and maximum productivity across open ground.

Another example — set-out. GNSS marks out the principal building axes and corners. The total station then lays out the detailed axis grid inside the structure to 3–5 mm accuracy.

GeoProGlobal Equipment

Our fleet covers both instrument classes:

Instrument	Type	Accuracy	Application
Trimble R12i	GNSS RTK	8 mm + 1 mm/km	Open sites, linear routes
Leica GS18	GNSS RTK	8 mm + 0.5 mm/km	Set-out, survey
Leica TS16	Total station	1″ / 1.5 mm	Detailed survey, as-built
Trimble S7	Total station	1″ / 1 mm	Set-out, monitoring

All instruments are calibrated and have current calibration certificates. When assembling a crew we select equipment for the specific site — we do not send a total station where a drone is needed, nor set up GNSS inside a workshop.

Practical Guidance

If you are preparing a technical brief for geodetic work, do not specify the survey method if you are unsure. It is sufficient to describe the site, the task, and the required accuracy. The survey firm will select the optimal instrument.

If a contractor insists on a single method for the entire site without analysing the conditions — that is a reason to ask for justification. An experienced crew always combines instruments.

Summary

GNSS (RTK) is the choice for open terrain, large areas, and linear features where high productivity is required at 2–3 cm accuracy.

Total station is the choice for enclosed spaces, constrained conditions, set-out work, and as-built surveys requiring 1–5 mm accuracy.

Both together is the optimal solution for large industrial sites where open areas and production structures alternate.

If you need advice on a specific project in Aktau or Mangystau Region, contact us. We will outline the optimal crew composition and equipment for your task.