Our Services

Aerial survey intelligence.
Engineered for infrastructure.

High-resolution UAV photogrammetry for infrastructure corridor mapping, condition assessment and digital terrain modelling. Delivered to engineering tolerances with full survey control and RICS-standard QA.

Sub-5cm
Positional accuracy
15,000+
km² captured to date
OSGB36
National datum referenced
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Aerial Survey

Precision aerial data for infrastructure assets.

Our aerial survey capability uses professional-grade UAV platforms and photogrammetric workflows to capture high-resolution imagery and point cloud data over infrastructure corridors, coastal zones, construction sites and greenfield areas.

All flights are planned under a documented survey control framework, with ground control points and independent checkpoints established to national datum. Outputs are delivered to engineering tolerances — not mapping standards — with full QA documentation traceable to OSGB36/ODN.

From single structure capture to multi-kilometre corridor survey, we provide scalable aerial survey capability that integrates directly into engineering, asset management and BIM workflows.

Capabilities

What we deliver.

Engineering-grade aerial survey outputs across the full range of infrastructure applications.

Orthomosaic Mapping

Seamlessly mosaicked aerial imagery corrected for lens distortion and georeferenced to sub-5cm accuracy. Suitable for corridor mapping, condition assessment and change detection.

Digital Terrain Modelling

DSM, DTM and contour generation from dense photogrammetric point clouds. Delivered in CAD, GIS and LAS formats to client specification and engineering tolerances.

Survey Control & GCPs

Full ground control network established using GNSS and total station. All outputs traceable to OSGB36/ODN with independent check point verification and full accuracy report.

Volumetric Analysis

Cut/fill calculations and volumetric reporting for earthworks, stockpiles and embankments. Derived from classified point cloud data with statistical confidence values.

Change Detection

Multi-temporal capture and comparison to identify movement, settlement, erosion and structural change. Systematic monitoring over defined periods with deviation reporting.

Corridor Mapping

Linear infrastructure survey from a few hundred metres to multi-kilometre extents. Seamless overlap and consistent resolution throughout, suitable for highways, rail and utility corridors.

Our Process

How we work.

A documented, quality-assured workflow from initial brief to final deliverable.

01

Survey Design

Flight planning, GCP network design, airspace authorisation and RAMS preparation. All operations conducted under CAA regulatory framework with documented methodology.

02

Mobilisation & Capture

Deployment with calibrated UAV platforms. Ground control established and verified before flight. Data captured to specification with in-field QA checks before demobilisation.

03

Photogrammetric Processing

Point cloud generation, orthorectification, model building and accuracy assessment. All processing conducted in-house using industry-standard photogrammetry software.

04

Delivery & Validation

Deliverables produced to client specification. Independent check point validation confirms accuracy. Full metadata, accuracy report and QA documentation included as standard.

Sector Applications
Highways & Roads Rail Infrastructure Nuclear Coastal & Marine Utilities & Water Construction Ports & Harbours
FAQ

Aerial survey questions.

The questions clients ask us most often before commissioning an aerial drone survey.

Angell Surveys is a RICS-regulated practice (Firm 681790) — verify our registration via the RICS Find a Surveyor directory.

What is an aerial drone survey?
An aerial drone survey uses an unmanned aircraft to capture high-resolution imagery and photogrammetric data over a site or asset, then processes the data into measurable outputs — orthomosaic imagery, digital surface and terrain models, contours, point clouds and volumetric reports. Every Angell Surveys aerial deliverable is georeferenced to OSGB36 / ODN via a documented Ground Control Point (GCP) network with independent check points reported alongside the data. Sub-5 cm absolute accuracy is routine on hard detail with well-controlled flights.
How accurate is an aerial drone survey?
With a documented GCP network and check-point verification, UAV photogrammetry typically achieves ±25–30 mm absolute positional accuracy on hard detail and ±30–50 mm on ground levels — equivalent to a Quality Level B utility survey or a Standard topographic survey. Where engineering-tolerance accuracy is required (rail, highway setting-out, structural verification) we hybridise UAV photogrammetry with terrestrial GNSS+TS capture to achieve ±5–15 mm. Every flight is reported against its check-point residuals, not advertised against a marketing number.
What deliverables will I receive from an aerial survey?
Standard outputs are an orthomosaic GeoTIFF, a digital surface model (DSM) and digital terrain model (DTM), contours at the requested interval (typically 0.25 m or 0.50 m), an AutoCAD DWG plan extract, and an accuracy report. Optional outputs include a classified LAS/LAZ point cloud, LandXML surfaces for Civil 3D import, volumetric reports against a reference surface (stockpiles, earthworks, fills/cuts), a video flythrough and 3D hosted models for stakeholder review.
What sites do you cover and what flight authorisations do you hold?
UK-wide coverage including Network Rail possessions, Highways England restricted areas, water and energy operator sites, nuclear-licensed facilities, HSE-regulated industrial sites and Critical National Infrastructure. UAV operations are flown under the appropriate CAA authorisations, with full RAMS, public liability insurance and operator training records supplied at proposal stage. Airspace authorisations are obtained where required for non-standard operations.
How does aerial survey compare to ground-based topographic survey?
They are complementary, not competing. Ground-based total-station and GNSS capture is the right tool for tight-tolerance setting-out, vegetated or shadowed terrain, and high-density built environments. UAV photogrammetry is the right tool for large open sites, brownfield, corridor mapping (highways, rail, utility), solar farms, earthworks volumetrics and any work where aerial overview produces meaningful data faster than walking the site. We hybridise on most projects — GCP control by total station, area capture by UAV.
Are you RICS regulated?
Yes. Angell Surveys is regulated by the Royal Institution of Chartered Surveyors (RICS) — verify via our public profile at ricsfirms.com/office/681790/Angell-Surveys-Ltd. All aerial survey work is conducted under the RICS Surveys of Land, Buildings and Utilities professional statement with documented control, independent check points and full QA records issued alongside the deliverables.
Related Services
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High-density point cloud capture for structures and corridors where photogrammetry alone cannot achieve the required resolution or accuracy.
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Aerial Inspection
Close-range UAV inspection of structures, buildings and infrastructure assets — eliminating the need for scaffold and rope access.
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3D Modelling & Reality Capture
Photogrammetric and LiDAR-based reality capture for digital twin creation, as-built documentation and hosted 3D asset models.
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Work With Us

Bring engineering precision to your next project.

Most scoping responses sent within one business day.

RICS-regulated work, led by Philip M. Angell MRICS.

Discuss your Aerial Survey Call 020 4652 4948