Land survey · Linear projects
Route Survey and Alignment Survey for Linear Projects
Centreline, chainage, cross-sections and crossings along roads, pipelines, cables and drains, issued section by section.
Quick AnswerA route survey maps a strip along a planned or existing line — road, pipeline, cable or drain. It fixes the centreline with chainage, takes cross-sections every 25 m and records every crossing, structure and boundary in the corridor. Design, land and quantities all work from it. If buried services run along the route, read about GPR scanning.
What is a route survey?
It maps a strip along a proposed or existing line, such as a road, pipeline, cable, drain or transmission corridor. It fixes the centreline, measures levels along and across it at regular intervals and records everything in the corridor that the design must handle.
Engineers also call it an alignment survey, or a linear project survey. The common thread is chainage: every feature is located by its distance along the line from a start point, written as 0+000, 1+250 and so on. That single reference ties the drawings, the quantities, the land papers and the site gangs together.
What gets recorded along the corridor?
The centreline, the cross-sections, and every crossing, structure and boundary inside the strip. On a standard job we take cross-sections every 25 m and at each change in ground or feature.
- Centreline points and intersection points (IPs), with deflection angles and chainage
- Cross-sections across the agreed corridor width, out to the right-of-way limits
- Road, rail, canal, nala and drain crossings, with bed and bank levels
- Buildings, walls, trees, poles, towers, culverts and bridges close to the line
- Visible signs of buried services: chambers, valve covers, marker posts
- Village and plot boundaries where land may be affected
How is the route alignment chosen and fixed?
On paper first, then on the ground, and only then in final coordinates. A good route alignment avoids the expensive things: buildings, deep crossings, sharp bends and land that cannot be acquired or used.
- Desk study: the line goes onto satellite imagery and your maps, with obvious conflicts marked.
- Walk-over: an engineer walks or drives the line, notes access, crossings and obstacles, and suggests shifts.
- Control: pairs of DGPS points are set along the route and marked for the contractor; a sample control sheet is under what you receive from a DGPS survey.
- Survey: total stations and rover GPS receiver units pick the centreline, sections and detail between them.
- Drawings: plan and profile sheets, cross-sections and a crossing schedule, all by chainage.
DGPS relies on a fixed base station over a pillar of known position, tracking the same gps signals as the rover, so any error common to both drops out. That is the differential global positioning system principle. If the corridor falls inside the coverage of Survey of India ground based reference stations, each pillar is linked to whichever reference station lies closest.
At junctions, stations, pumping sites and river crossings the strip is not wide enough for design. There the narrow strip expands into a complete site plan, and the page who to call for topographic survey covers that broader task.
What do the route drawings look like?
Plan-and-profile sheets, each covering a fixed chainage length, with cross-sections and a crossing schedule behind them. The plan strip shows the centreline, corridor limits and every feature; the profile shows ground levels along the line for the designer to draw on.
- Plan and longitudinal section sheets, matched by chainage
- Cross-section sheets at every 25 m station
- Crossing schedule with chainage, type, owner where known and levels
- Control point sketches and coordinates for the contractor
- KMZ or SHP of the alignment for GIS and land teams
All drawings come in DWG and PDF, with coordinates in Excel or CSV, about 3 working days after the crew finishes a short route; long corridors follow the agreed programme.
How fast does a route survey move?
Access matters more than instruments. An open rural road with a clear verge moves quickly; a narrow town lane with parked vehicles, shop fronts and traffic moves slowly, because each section waits for a gap. Crops, fences and missing permissions slow it further. We therefore agree a programme per section, not a kilometres-per-day promise, and flag early any stretch needing a permission or escort.
Which linear projects need a route survey?
| Project | Main survey focus | Common additions |
|---|---|---|
| Roads and widening | Centreline, cross-sections, existing pavement and drains | Junction plans, tree count |
| Water and sewer pipelines | Levels for gravity falls, crossings, valve sites | Utility scan at crossings |
| Optical fibre and power cables | Corridor clearance, chambers, road and rail crossings | GPR before trenching or HDD |
| Drains and canals | Bed and bank levels, outfall levels, longitudinal fall | Bathymetry for wet sections |
| Transmission and pipeline corridors | Tower or valve positions, land parcels, access | Drone orthophoto of the strip |
Table note: after construction, the same chainage carries into the record drawings; see as built survey rates and scope.
What about cables and pipes already under the route?
A route survey shows their surface signs; finding the lines themselves needs a utility scan. On a route to be trenched or bored, buried services at crossings are the main risk. A GPR scan on the same chainage puts those lines onto the route drawings, while the bore path gets a closer look under HDD route survey. The Mezux guide: GPR survey deliverables shows how utility layers are presented.
Route survey rates – November 2026
₹12,000 per km for centreline and cross-sections every 25 m, with a minimum of ₹50,000. A 3 km pipeline route is billed at the ₹50,000 minimum, and a 10 km road at ₹1,20,000, both plus GST. Where only a mapped strip without full cross-sections is needed, a topographic road strip at ₹15,000 per km may suit better. DGPS control points along the route are ₹3,000 each if bought on their own.
Inside Delhi NCR, field work on a route begins on the day you give approval, or within 1 working day at the latest. Corridors in other states go to a team member living along or near them, who starts the walk-over immediately or within 1 working day. Any travel cost is shown in the quote. Long routes are issued in sections, so design can begin before the last kilometre.
What should you send to get the route priced?
A KMZ or sketch of the line, its approximate length, the corridor width and the project type. Add any client standard, such as a tighter section interval or a set drawing scale, because that changes field time. Flag stretches across private land, railway property or a national highway; they may need permission first and are shown separately in the quote.
Who carries out the work?
Mezux Touch's own field teams, using company-owned instruments, with members based in every city we serve. Mezux Touch has surveyed linear routes since 2003, including 1.5 lakh+ km of utility corridors scanned with GPR. Corridor jobs draw on 4 DGPS base + rover sets, 6 total stations and 6 auto levels, with 2 RTK mapping drones for wide or hard-to-reach strips. On the chainage control, satellite based positioning is accurate to 1–2 cm horizontally and 2–3 cm vertically, whereas the total stations achieve 5 mm + 3 ppm. For a written scope and price, send us a KMZ of the line or share the site location instead.
Frequently asked questions
What is chainage?
Distance measured along the centreline from the start point, written as kilometres plus metres, for example 2+375. Every feature and drawing on the route is referenced to it.
How wide is the corridor surveyed?
It depends on the project: often the right-of-way width plus a margin. We agree it in the quote, and widen it at junctions and crossings.
Can the survey show land owners along the route?
We can plot village and plot boundaries from the maps you provide. For how official boundaries are fixed, read Land Demarcation Survey in Delhi NCR.
Can you survey a live highway?
Yes, with traffic management agreed with the road owner. Cross-sections over live lanes are taken in planned windows.
Do you issue drawings before the whole route is done?
Yes, long routes are issued in sections of a few kilometres at a time, so designers can start early.
Get a written quote for a route survey
Related land surveys
Buried services on the route
Written by Saniya Parveen · Technically reviewed by Rahul Rai · Updated 8 November 2026