Atomic Knowledge · Revit

Shared Coordinates (Revit)

Revit's mechanism for tying its internal coordinate system to a real-world site coordinate system shared across linked models and surveys.

Last reviewed 2026-05-24 Editorial process

Definition

Every Revit project has an internal origin (Project Base Point) and a survey origin (Survey Point). Shared coordinates establish a real-world reference (e.g., state plane, OS National Grid) that travels through linked models. Acquire Coordinates copies coordinates from a linked model into the host; Publish Coordinates writes the host's coordinate system into the link.

When shared correctly, every team's Revit model places at the same world position regardless of who is the host.

Why it matters

Without shared coordinates, linked models end up overlapping at internal origins (typically near 0,0,0) instead of at the building footprint. Aligning by visual snap is unreliable and breaks down on subsequent link updates.

Technical Deep Dive & Core Mechanics

At the database tier, Shared Coordinates (Revit) within the Revit ecosystem relies on a structured, relational object graph rather than simple visual vectors. Each instance is tracked by a unique Global Unique Identifier (GUID), linking its geometry to semantic parameters in the project database. When rendering or scheduling, the engine performs real-time queries to resolve parameter values and apply visibility graphic overrides.

Advanced Troubleshooting & Error Diagnostics

Topological Reference Orphaned (Revit Warn 102-A): Occurs when a sketch or parameter reference is lost due to a parent wall/slab deletion. Resolution: Edit the sketch plane and re-associate the broken constraints to active levels.
Shared Coordinates Deviation: Model shifts by several inches or yards during export. Resolution: Verify that the host model's Project Base Point and Survey Point are correctly mapped and coordinate values are aligned before performing a global coordinate publish.

Common pitfalls

Confusing Project Base Point and Survey Point — moving one without understanding the difference relocates the model.
Publishing coordinates from the wrong host — locks the link into a coordinate origin nobody intended.
Not documenting which model is the coordinate source — every subsequent linker has to guess.
Acquiring coordinates from a CAD link without checking units — produces 304.8× scale errors (feet vs. inches).

🛡️

This concept is a core structural element of the Revit drafting and engineering environment developed by Autodesk. Autodesk's flagship BIM authoring tool — the building model becomes the single source of truth for plans, sections, schedules, and clash detection.

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Relevant Revit FAQs

Direct answers from our technical editorial desk concerning related workflows.

❓ Is Revit available on macOS?

No. Revit is Windows-only. Mac users typically run Revit inside Parallels, VMware Fusion, or Boot Camp (Intel Macs). On Apple Silicon, virtualisation requires Windows-on-ARM and is officially unsupported by Autodesk. The closest cross-platform alternative is ArchiCAD.

❓ Can Revit open RVT files from older versions?

Yes — Revit can open any older RVT, upgrading it on open. Once upgraded, the file cannot be saved back to the older version. For cross-version coordination, export to IFC or DWG, or maintain a parallel older file.

❓ Why is my Revit project so slow?

Most common causes: too many in-place families, oversized linked DWG CAD files, raster image imports, links not workset-isolated, unused worksets visible in all views, view templates not used (so views render with unique graphics settings), and too many parameters in mass schedules. Use Manage > Purge Unused and Audit on open.