LiDAR Survey Services for Sites and Corridors

What is a LiDAR survey, and why can it see through trees?

A LiDAR survey measures the ground by firing hundreds of thousands of laser pulses a second and timing each echo, so it records millions of 3D points rather than photographs. Leaves and branches stop some of each pulse, but part of it passes through gaps and reflects from the soil underneath. That later echo is what lets the method produce true ground levels in orchards, scrub and plantations where a camera only sees green.

Our drone LiDAR payload is flown on an RTK drone, with an inertial unit recording the sensor's tilt and heading many times a second. Combined with DGPS control on the ground, each point gets an easting, northing and height. The result is a point cloud that can be cut in any direction: plan, long section or cross-section.

LiDAR or drone photogrammetry: which do you need?

Choose LiDAR when vegetation hides the ground or when thin features such as wires and pipe racks matter; choose photogrammetry for open sites where a photo map is the main output. Many clients start by reading about a drone survey in India for your site and only move to LiDAR when trees or scrub come up.

Table note: LiDAR is priced per acre; if your land papers give the area in bigha, kanal or gaj, see our note on Land Area Converter before you compare quotes.

Which projects use laser mapping most?

Linear corridors and vegetated land, where walking a level grid is slow and photos cannot see the soil.

• Road, rail and canal alignments: long strips with roadside trees and embankments; the point cloud gives cross-sections at any interval. If the brief is a classic centreline and 25 m sections, compare with booking a route survey by ground crew.
• Transmission and distribution lines: conductor sag, tower positions and tree clearance along the line.
• Plantations and hilly scrubland: drainage design and earthwork where the ground is hidden.
• Industrial plants: pipe racks, tank farms and structures captured in 3D; for a full drawing of what was built, our as built survey team combines the cloud with tape and total station checks.
• Mines and dumps: volumes on steep faces that are unsafe to walk.

For flat, open land without trees, LiDAR is rarely worth the extra cost; check what a topographic survey costs first.

What do you receive from a LiDAR survey?

A classified point cloud, a bare-earth terrain model and CAD drawings derived from them. Points are delivered in the LAS or LAZ format published by the American Society for Photogrammetry and Remote Sensing (ASPRS). Each point carries a class code; ASPRS uses 2 for ground, 3 to 5 for low, medium and high vegetation, 6 for buildings and 9 for water, and we keep to those codes so any software reads them the same way.

• Classified point cloud (LAS/LAZ), tiled for large areas
• Terrain model and surface model (GeoTIFF)
• Contours, spot levels and cross-sections (DWG/PDF)
• Canopy height or clearance maps where asked
• Control report with check-point errors (PDF, Excel)

What happens to the data after the flight?

Raw laser ranges are not a survey yet; four processing stages turn them into levels you can design on. Most of the effort on a LiDAR job sits here, which is why we explain it before you compare prices.

1. Trajectory: the drone's GNSS and inertial records are combined with our base-station data to rebuild the exact path and attitude of the sensor through the flight.
2. Strip matching: neighbouring flight strips overlap. Roofs and roads seen in both strips must sit at the same height; small boresight and timing offsets are corrected until they do.
3. Control fit and noise removal: the cloud is shifted onto the DGPS control, and stray points from birds, dust or multipath are cleaned out.
4. Classification: software separates ground from everything above it, and an operator then reviews the result tile by tile. Bridges, culverts, bunds and steep banks are where automatic filters most often go wrong, so those get a second look.

Only after these steps do we cut contours, sections and volumes. If your consultant works in a local grid or a project datum, tell us at the start; transforming at the end of the job is possible but costs time and adds a step where errors can creep in. We keep the raw flight data, so a section at a new chainage or a fresh contour interval can be produced later without flying again.

How accurate is drone LiDAR, and how do we check it?

Accuracy is proven on the ground, not claimed: we survey independent check points by DGPS and report how far the LiDAR surface sits from them. DGPS points themselves hold 1–2 cm horizontally and 2–3 cm in height. Hard, flat check surfaces such as roads and concrete pads are used because they show any height bias clearly.

Several things reduce LiDAR quality: very dense evergreen canopy where few pulses reach the soil, wet black surfaces that return weak echoes, and water, which absorbs the near-infrared laser and gives no usable bed level. A flooded pit or pond on the site needs an echo sounder or manual soundings instead. Point density is set by flying height and speed; we agree the density in the quote so there is no argument later.

LiDAR survey rates – November 2026

Drone LiDAR is ₹2,500 per acre with a minimum of ₹1,50,000 per job, exclusive of GST. The rate covers flying, ground control, classification and the standard deliverables listed above.

• 100 acres: 100 × ₹2,500 = ₹2,50,000
• 40 acres: works out to ₹1,00,000, so the ₹1,50,000 minimum applies
• A 4 km corridor 100 m wide covers about 99 acres, close to ₹2.47 lakh
• Mobilisation or travel, where applicable, is added in the written quote

A written quote fixes the final amount for your area, point density and drawing list.

How long does a LiDAR job take?

Flying is usually the short part of the job; processing and classification take longer. In Delhi NCR the crew normally reaches site the same day or within 1 working day of confirmation; elsewhere in India our locally based team member begins ground control at once, or within 1 working day at most. First drawings usually follow within 3 working days of field work on smaller jobs; long corridors are issued section by section to an agreed programme. Airspace checks under the Drone Rules, 2021 apply exactly as for any drone flight, so sites near airports may need extra time for permission.

Send a KMZ or a marked map and the purpose of the drawing, and ask about survey rates for your project; an engineer will reply with scope and price in writing.

Frequently asked questions

Can LiDAR measure the bed of a river or pond?

No. Topographic LiDAR uses a near-infrared laser that water absorbs. We survey the banks with LiDAR and the bed with an echo sounder.

Can you scan a highway from a vehicle instead of a drone?

For pavement condition, roughness and video along a highway, the Mezux network survey vehicle is the right tool. Drone LiDAR suits terrain and corridor mapping.

What point density do I need?

It depends on the drawing. Contours for drainage need far fewer points than a model of pipe racks. We agree a density in the quote.

Will I be able to open the point cloud?

Yes. LAS and LAZ files open in free viewers as well as CAD and GIS software. We also give DWG drawings for people who do not work with clouds.

Is a LiDAR survey accepted for design?

It is widely used for design and DPR work, provided the control and check-point report shows the accuracy. That report comes with every job.

Do you fly in monsoon?

Only in dry spells. Rain and low cloud stop flying, and standing water on the ground reduces returns.

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