Why Two Accurate Surveys Can Disagree: Coordinate Systems and Height Datums in Ireland

Total station and survey target in an Irish landscape with two conceptual survey reference surfaces.

Why credible survey datasets can fail to align, how Irish Grid, ITM and height datums differ, and what to check before combining terrain, utility, drone and setting-out information.

Setting Out on Site: Control, Checks and Responsibilities

Total station, survey prism and setting-out markers on a prepared construction site.

A practical guide to setting-out control, design revisions, tolerance, independent checks and the responsibilities to agree before construction.

What Is a Topographic Survey? Scope, Deliverables and Timing Explained

Surveyor measuring sloping terrain with a GNSS rover and contour lines across the landscape.

A practical guide to commissioning a topographic survey: features, levels, boundaries, terrain models, deliverables and the factors that influence timing.