DGPS Survey for Wind Farm Control, Turbines and Cables

Why does a wind project need a DGPS survey for wind farm work?

A wind farm is not one site but dozens of scattered locations, and DGPS is the practical way to put all of them on one accurate coordinate system. Turbines stand hundreds of metres apart across farmland, hills or scrub, linked by new roads and buried cables. A total station alone would need endless traverses, and hand-held GPS would put turbines metres from their micro-sited positions.

With a properly observed network, every later task (land parcels, stake-out, road design, cable routes, as-built records) uses one reference, so drawings from different teams fit without adjustment.

How is the control network laid out?

As permanent control pillars spread across the project, observed in long static sessions and adjusted together. Pillars sit on stable ground with clear sky, near turbine clusters and along the main access road. Each is observed in sessions shared with its neighbours, because the gps signals reaching both receivers carry common errors that cancel. The network is tied to a national reference station where possible.

Which locations get surveyed, and in what order?

In the order the project needs them: land first, turbines second, then the infrastructure that joins them.

1. Land parcels: each bought or leased parcel is measured, often field by field from revenue maps, so footprints, roads and cable corridors sit on secured land.
2. Met mast and wind study points: positions fixed for the resource study.
3. Turbine locations: micro-siting coordinates are staked, checked against ground conditions and adjusted where the consultant agrees.
4. Foundation and hardstand: a local topographic survey at each turbine gives spot levels for the foundation, crane hardstand and blade laydown.
5. Access roads: centreline and cross-sections, with attention to gradient and curve radius for blade transport.
6. Cable routes and substation: the collection cable route to the pooling substation, and the substation plot.

What goes wrong when control is skipped?

Small offsets that grow expensive, often found only when two teams' drawings are overlaid. A land team, wind consultant, civil designer, road and cable contractors and the turbine supplier all work on one project. If each uses its own local reference, nobody notices the drift until something is built in the wrong place.

• Turbine on the wrong parcel: A turbine staked by hand-held GPS lands over a parcel line on unsecured land, and construction stops.
• Foundation on poor ground: A ten-metre shift can move a foundation from rock onto fill or a nala edge, so the geotechnical data no longer applies.
• Roads that do not meet: Two contractors on different references build sections that miss at the joint in plan and level.
• Cable lengths wrong: Drums ordered from design lengths run short, or joints land in the wrong place.
• Untrusted records: Years later, the operator cannot find a cable joint because the as-built sits on a different system.

Control costs a small fraction of any of these and is done once for the project's life. The same pillars serve the land team in month one and the operations team twenty years later.

How are land parcels handled?

Each parcel is measured on the ground, with its area in the units the land records use. Projects in Gujarat, Rajasthan, Maharashtra, Karnataka, Tamil Nadu and Andhra Pradesh meet widely different local units, and one project may straddle districts. Parcel statements give square metres, hectares and acres beside the local unit. To check a deed figure, convert bigha, gaj and acre on our converter page.

Where a parcel boundary is contested, the survey shows the measured position; official demarcation rests with the revenue authorities.

What makes wind farm roads and cables different?

Blade length. Long blades need trailers with gentle curves, limited gradients and clear swept paths. The road survey therefore picks trees, walls, poles and culverts near each bend, not only the carriageway, for the transport planner's swept-path check.

Internal cables run along roads or across fields between turbines and often cross irrigation pipelines, village water lines, telecom cables and, occasionally, oil or gas pipelines. Before trenching, follow the steps in details on Call Before You Dig in India and scan crossings with GPR where records are thin.

What does the developer receive?

Table note: for detailed parcel boundaries against revenue records, read questions to ask before land survey services. After construction, a record of turbines, roads and cable routes as built is worth keeping; see as built survey: scope, time and cost.

Rates and programme

Wind projects are quoted from point, area and route rates, with any mobilisation/travel cost, if applicable, shown in the written quote.

• DGPS control points and turbine stake-out: ₹3,000 per point.
• Parcel DGPS survey: up to 1 acre from ₹12,000; 1–5 acres ₹2,500 per acre.
• Topographic survey of turbine pads and substation: ₹4,000 per acre up to 10 acres, ₹2,500 for every acre beyond the first 10, minimum ₹15,000 per job.
• Road and cable route survey with cross-sections every 25 m: ₹12,000 per km, minimum ₹50,000.
• Drone survey of corridors or pads: from ₹40,000 per site up to 25 acres, ₹1,500 per extra acre.

GST is extra, and the written quote fixes the amount. A team member is based in each wind region we serve, so observation begins immediately or within 1 working day of the order. A medium project's control network takes several days of observation, after which stake-out and parcel teams work in parallel. Field drawings follow within about three working days of each batch. To schedule a project, get a price for this work with the layout and parcel list.

Frequently asked questions

Do you carry out the wind resource study?

No, wind measurement and micro-siting are done by the wind consultant. We fix and stake the positions they choose and survey the ground around them.

How accurate is turbine stake-out?

With RTK on the project control, which applies the differential global positioning system principle in real time, staked points fall within 1–2 cm of their design coordinates.

Can you survey land parcels across several districts?

Yes, parcels are tied to the same control network wherever they lie, and area statements use each district's local unit.

How are buried crossings shown on the cable route?

As marked crossings with depth notes; see GPR survey deliverables for how scan results are presented.

Can drone mapping replace ground survey on a wind farm?

Drones map pads and corridors quickly, but they still need DGPS ground control, and turbine stake-out remains a ground task.

Will the control pillars stay for the construction team?

Yes, pillars are built to last through construction, with descriptions and coordinates, so any contractor can run construction layouts from them.

Written by Saniya Parveen · Technically reviewed by Rahul Rai · Updated 8 November 2026