CAA-Approved Elevation Survey Drone pilots

Drone Elevation Surveys.

Compare quotes from UK drone surveyors for elevation data your engineer can design against — contours, DEM/DSM, and cross-sections for drainage, flood-risk assessments, planning submissions, and earthworks.

“Every drone pilot on this network is personally vetted by me — insurance, qualifications, flight history.”

Peter Leslie · Founder & GVC Drone Pilot

Trusted by site managers & agencies across the UK

Need elevation data?

Post your brief to compare quotes from elevation-survey specialists.

Getting levels wrong is an expensive mistake.

Drainage engineers, flood consultants, and earthworks contractors are making decisions on LIDAR Composite tiles that are a decade out of date. A fresh drone survey fixes that overnight.

Stale National LIDAR Tiles

Environment Agency LIDAR Composite is excellent free data — except when the ground has moved. Quarry faces, stockpiles, remediated spoil, and recent groundworks all make composite tiles unreliable. Commission a fresh drone survey and you have current levels to design against.

Cut & Fill Surprises

An earthworks tender priced off a rough levels assumption is a claim waiting to happen. A drone elevation survey — pre-contract — locks the volumes down and removes the contractor's biggest pricing risk.

Flood-Risk Objections

An FRA submitted on coarse national data invites questions from the Environment Agency and the LPA drainage officer. A site-specific elevation survey at 30mm vertical accuracy usually cuts the objection volume dramatically.

Elevation data is only as good as its vertical datum.

By Peter Leslie, Founder & GVC Drone Pilot

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An elevation model without a stated vertical datum is a picture, not data. If the engineer can't trust that the levels are tied to ODN and validated against check points, the whole model is useless for drainage or flood work.

Every elevation-survey drone operator on this network anchors their data to OSGB36 / ODN via OSTN15 and a UK geoid model, laying ground control, and validating RMSE against independent check points before release.

That's the discipline the Environment Agency, LPAs, and civils engineers expect — and exactly what they get.

OSGB36 / ODN Validated

RTK Workflow & £5M Public Liability

Design-ready elevation deliverables.

Our drone operators deliver outputs your drainage engineer, flood consultant, or earthworks contractor can drop straight into the model.

Contour Lines

Intervals from 100mm to 500mm depending on terrain, labelled and layered in DWG/DXF. Ready to drop into Civil 3D or MicroDrainage as a reference surface.

DEM / DSM Rasters

Both a Digital Surface Model (top surface) and a Digital Elevation Model (bare earth, where topography allows) as GeoTIFFs tied to BNG and ODN. Drop straight into ArcGIS or QGIS.

Cross-Sections & AOD Report

Cross-sections cut at requested chainages, plus an accuracy report quoting validated AOD levels against check points. Everything a flood or drainage engineer needs to sign off confidently.

Book your elevation survey in 3 steps.

We route your brief to RTK-equipped drone pilots who understand vertical accuracy and UK datums.

Describe the Site

Share the site extent, purpose, contour interval, and cross-section chainages if needed. Under two minutes to submit.

Compare Quotes

We route the brief to survey-grade drone pilots in your region. You receive quotes covering accuracy, deliverables, and turnaround.

Fly & Deliver

Your drone pilot flies with ground control, validates against check points, and delivers contours, DEM/DSM, and cross-sections with an accuracy report.

Start Your Project Brief

Elevation data you can design against.

See how drainage engineers, flood consultants, and earthworks contractors rely on drone elevation surveys through our network.

"National LIDAR was showing a spur we knew had been regraded two years ago. The drone elevation survey gave us current AOD levels across the whole catchment and our SuDS attenuation design was signed off without any EA pushback."

Eleanor B.

Drainage Engineer, Birmingham

"Cross-sections at 25m chainages along the watercourse, with validated levels against our check points, delivered in five days. That dataset carried the entire flood-risk assessment for the development."

Nicholas J.

Flood Consultant, Norwich

"Pre-contract drone elevation survey on a 6-hectare groundworks job saved us from a five-figure cut-and-fill claim. We locked volumes in before tender and the figures held all the way through the build."

Paul McK.

Earthworks Contractor, Belfast

Elevation Survey FAQ

Questions on vertical accuracy, datums, and deliverables.

What vertical accuracy can I realistically expect?

With RTK positioning and laid ground control, drone elevation surveys routinely hit ±25–40mm vertical against check points on open sites. On heavily vegetated sites, LiDAR payloads are needed to get the same accuracy on bare earth. Every deliverable ships with a stated RMSE so there is no ambiguity.

Are levels tied to OSGB36 and ODN?

Yes. Drone operators transform from the WGS84 ellipsoid into OSGB36 / British National Grid using OSTN15, then level to Ordnance Datum Newlyn (ODN) via a published geoid model. All deliverables quote AOD in ODN — directly consumable by UK civils, drainage, and flood models.

What does AOD actually mean on a drone deliverable?

AOD — Above Ordnance Datum — means heights are expressed relative to mean sea level at Newlyn, Cornwall (ODN). Every level on a drone elevation deliverable is expressed in AOD metres so it can be directly compared with bench marks, Environment Agency flood levels, and existing topographic records.

Will I get DEM and DSM, or just one?

A standard photogrammetric elevation survey delivers a DSM — the top surface. For a true bare-earth DEM, especially on wooded or heavily vegetated sites, a LiDAR survey is recommended. Drone operators will flag this at quoting stage and recommend the right sensor for your site.