PAS 128:2022 classifies every buried service on a utility survey drawing by how it was located: records (QL-D), site reconnaissance (QL-C), geophysical detection (QL-B4 to QL-B1) or exposure (QL-A). This guide explains the sub-levels, the methodology types, the RICS band each maps to, and how to choose the level for each project stage.
UK SORA has replaced the Operating Safety Case as the route to complex and BVLOS drone operations. After nine years under an OSC, Angell Surveys transitions to SORA in March 2027 — here is what the framework involves and how it underpins our BVLOS roadmap.
How a GNSS position in latitude and longitude becomes an Ordnance Survey National Grid coordinate — datums, ellipsoids, the Helmert transformation, OSTN15 and the Transverse Mercator projection, set out in full.
Surveying is the oldest applied mathematics there is. The geometry that measures a field in Suffolk is the geometry that measures one in Shaanxi — and that universality is what lets a global profession speak with one voice.
Tanks, vessels, shafts, sewers, ducts and voids are the most dangerous places a surveyor can go. Collision-tolerant UAVs let you inspect them without anyone going in. This guide explains how Elios-class drones work, when to use the Elios 2 versus the Elios 3, and what they deliver.
Linear infrastructure — rail, highway, pipeline, river catchment — is the survey geometry a fixed-wing VTOL was built for. This guide explains how corridor mapping with the WingtraRAY works, how ground control is spaced along a corridor, and why the platform beats both multirotor and crewed aircraft for long, narrow sites.
A Development Consent Order survey is not just a bigger topographic survey. It is a single dataset that has to satisfy the Environmental Impact Assessment, Flood Risk Assessment, drainage strategy, Biodiversity Net Gain baseline and highways agreement simultaneously. This guide walks through the UAV workflow that delivers it.
The choice between a fixed-wing VTOL and a multirotor UAV is rarely about which flies better — it is about coverage rate, mobilisation, and cost per hectare at the scale of your site. This guide breaks down the economics of each and the crossover point where one decisively beats the other.
Capturing a defect in a 3D survey is the start, not the end. The value is in tracking it through its lifecycle — assessment, prioritisation, remediation, verification — and sharing it with every stakeholder without specialist software. This guide explains how a cloud-hosted Nira model does that.
A UAV survey on a nuclear-licensed site is a survey wrapped in a security, safety and access regime unlike any other sector. The flying is the easy part. This guide explains what makes nuclear survey work different and how the workflow is built around the constraints.
A drone captures position in WGS84 — but UK engineering deliverables are required on OSGB36 / Newlyn ODN. Getting from one to the other correctly, through OSTN15 and OSGM15, is what separates an engineering-grade survey from a pretty map. This guide explains the workflow.
Satellite positioning is the backbone of modern survey — until you go indoors, underground, under a bridge, into an urban canyon or beneath dense canopy. This guide explains where GNSS fails, why, and the survey methods that keep delivering accuracy when the sky disappears.