GPR Survey · Telecom
Why Telecom Companies Need a GPR Survey Before Laying Fibre
What a ground penetrating radar survey finds on an OFC route, what the telecom team receives, and how it prevents service strikes, fibre cuts and rework.
Quick AnswerA GPR (ground penetrating radar) survey maps the cables, pipes and ducts already buried along a planned fibre route before any work starts. For a telecom company that means fewer service strikes and fibre cuts, an alignment that holds once construction begins, and a signed record of what lies underground on every stretch.
Why a fibre route needs a GPR survey first
Every new OFC route in India shares the ground with something: power cables, water and sewer lines, gas pipes, chambers and, more and more often, other operators' ducts. Most of it is missing from the drawings, or sits somewhere other than where the drawings say. A GPR survey for telecom operators finds those services before the route is built, so the alignment, the crossings and the work programme are planned around what is really there.
The cost of skipping it shows up later: a damaged power cable or water line, a cut in a live fibre that takes customers offline, crews standing idle while a route is redesigned on site, and stretches that have to be done twice. A survey costs a small fraction of any one of those.
What the survey finds on a telecom route
- Parallel services running along the alignment, which decide where the new duct can go.
- Crossings — every service that cuts across the route, with an approximate depth and angle.
- Congested strips where several services are bunched together and the route has to move.
- Chambers, manholes and obstructions, including buried objects that nobody can identify.
- Existing telecom ducts, including HDPE ducts where the ground conditions allow radar to see them.
- Ground that limits radar depth, so the planner knows where the findings are less certain.
How a fibre route is surveyed
Our crews run ground penetrating radar along the planned duct line and add cross-lines at junctions and crossings. EM locators trace conductive services such as live cables and metal pipes; radar adds the plastic pipes and ducts that an EM locator cannot see without a tracer wire. Each detected service is marked on the ground with its approximate depth, and every find is recorded by chainage together with the detection method and how confident the result is. At hard points such as junctions and manhole clusters, a 3D grid scan can be added. The full field method is set out in our guide to GPR scanning for OFC routing.
What the telecom team receives
- Ground marks for each detected service along the route.
- A signed report listing every find, its approximate depth and how it was detected.
- A chainage-referenced crossing schedule: what crosses, at what depth and angle, and with what confidence.
- The radar depth achieved on each section, and a list of stretches that could not be scanned, with the reason (parked vehicles, flooding, locked premises, access limits).
- An optional L-section GPR survey that adds a depth profile along the route.
- Layered CAD drawings with SHP or KML files when a drawing set is ordered, and a draft issue for comment before the signed version.
Each completed stretch gets its own report, so planning and approvals can move ahead on finished sections while the rest of the route is still being surveyed.
What GPR can and cannot tell you
An honest survey states its limits. Radar depth depends on the soil: wet clay and saline ground reduce how deep it can see, and small or deep plastic ducts in wet clay can be missed. Radar shows where a duct is, not whether it is full, empty or damaged; duct capacity needs the owner's records or a chamber inspection. Low-confidence finds are flagged rather than guessed, and a trial pit can confirm a critical point. See EM cable locator vs GPR for why the two methods are used together.
Telecom projects that use a GPR route survey
- NLD backbone routes along highways and state roads, including canal and rail crossings.
- FTTH and BharatNet rollouts — see our BharatNet and FTTH fibre route survey guide.
- 5G fibre backhaul to new sites — see the 5G backhaul route survey guide.
- City duct routes and data-centre links, where services are densest and a strike is most costly.
Survey capacity for national rollouts
Telecom programmes run to fixed go-live dates, so survey capacity matters as much as accuracy. Mezux Touch runs 58 company-owned GPR systems with in-house crews — nothing hired in and nothing sub-let. Since 2003 our teams have surveyed more than 1.5 lakh km across 28+ States and UTs, with a peak output of 100 km a day on open corridors and a best month of 700 km. Fibre corridors we have delivered include Bawana (135 km), the NDMC area (225 km) and Okhla (67 km), and our clients include India's leading telecom operators.
What a telecom GPR survey costs
A standard GPR survey is ₹24 per metre and an L-section survey ₹32 per metre (GST extra), with a minimum order of ₹50,000 in Delhi NCR and ₹1,00,000 elsewhere. Discounts apply to the whole order: 25% above 100 km, 40% above 500 km and 50% above 1,000 km. For example, a 60 km standard survey costs ₹14,40,000 and a 250 km survey ₹45,00,000. Outside Delhi NCR a ₹1,00,000 project minimum applies. Mobilisation, night shifts, traffic arrangements and CAD/GIS drawing sets are priced separately. The full table is on the GPR survey price list.
When to book the survey
Book it once the draft alignment is ready and before the route is frozen. At that point the findings can still move the alignment, the crossing points and the work programme at almost no cost. Booked after construction has started, the same findings can only explain a problem that has already happened. For a route-level quote, see our OFC route GPR survey service.
Related insights
More on underground surveys for telecom routes:
GPR Survey Explained|Utility Mapping and Strike Prevention|India Fibre Backbone Rollout
Planning a fibre route?
Send the alignment as a KML file or chainage list and we will quote the GPR survey for the whole route.
Get A Quote +91 99100 10209GPR survey for telecom companies — detailed questions
Telecom teams usually ask the same things before they commission a route survey: what it will find, how far it can be trusted, how quickly it can keep up with a rollout and what it costs. The short answers are below.
Common questions
What does a GPR survey find on a telecom route? Existing services along and across the planned fibre alignment: power cables, water and sewer lines, gas pipes, other operators' ducts, chambers and unidentified buried objects, each with an approximate depth.
Can GPR detect HDPE telecom ducts? Often, yes. Radar can pick up plastic ducts in dry ground, but detection depends on the duct size, its depth and the ground moisture. Low-confidence finds are flagged in the report, and a trial pit can confirm a critical point.
Can a GPR survey tell whether an existing duct is empty? No. Radar shows where a duct is, not whether it is full, empty or damaged. Duct capacity needs the owner's records or a chamber inspection.
How fast can a fibre route be surveyed? Up to 100 km a day on open corridors with day and night shifts, and 700 km in our best 30 days. On city routes the pace depends on congestion and access.
How much does a GPR survey for a fibre route cost? ₹24 per metre for a standard GPR survey and ₹32 per metre for an L-section survey, with GST extra. Whole-order discounts apply above 100 km, 500 km and 1,000 km. Outside Delhi NCR a ₹1,00,000 project minimum applies.
When should a telecom company book the survey? Once the draft alignment is ready and before the route is frozen, so the findings can still move the alignment and the crossing points.
Terms used on this page
GPR — ground penetrating radar, which sends radio pulses into the ground and records the echoes from buried objects. EM locator — an electromagnetic instrument that traces conductive services such as cables and metal pipes. Chainage — distance measured along the route, used to reference every find. Crossing schedule — the list of services that cross the route, with depth, angle and confidence. L-section — a depth profile drawn along the length of the route. Trial pit — a small inspection pit that confirms what the radar shows at a critical point.
