What is the difference between a datum and a benchmark in surveying?

A datum is the overall reference system, while a benchmark is a specific physical point on the ground that records a known height or coordinate based on that datum.

For more details about datum points, read our in-depth blog.

Related Questions

What is Ordnance Datum in the UK?

Ordnance Datum (OD) is the standard height reference for the UK.

How do surveyors choose a datum point on a construction site?

Surveyors select a stable, accessible location and tie it to the project’s chosen datum system using GNSS or total station measurements.

What is the difference between a vertical datum and a horizontal datum?

A vertical datum sets the reference for height or elevation. A horizontal datum sets the reference for position.