Revit Tip: Establish and Verify Shared Coordinates in Revit

Use Revit’s coordinate tools to verify model alignments early and often to avoid costly rework.

• Establish the coordinate framework first:
  • Confirm Project Base Point (PBP) and Survey Point (SP). Keep both pinned; do not “drag” them to fix coordinates.
  • Set True North and Project North correctly (Manage > Position > Rotate True North/Project North).
  • Use Specify Coordinates at Point to place a known geodetic coordinate on a survey control, rather than moving the model.
  • If an external survey exists, Acquire Coordinates from the survey/site model, then link other models By Shared Coordinates.
• Verify alignment with Spot Coordinates:
  • Annotate control points (e.g., grid intersections, building corner) using Annotate > Spot Coordinate.
  • In the Spot Coordinate’s Type/Instance properties, set the Reference to Project Base Point or Survey Point to confirm both systems.
  • Place at least three non-collinear checks per level. Discrepancies reveal rotation and translation issues immediately.
• Audit linked models:
  • Link models using Auto – By Shared Coordinates once the shared system is established (Manage Links > Revit).
  • Copy/Monitor critical alignment drivers (Levels, Grids). Run Coordination Review routinely to catch drifts or edits.
  • For consultant updates, Reload and re-check with a dedicated “Coord QA” view that displays Spot Coordinates and Levels/Grids.
• Practical checks before major milestones:
  • Create a 3D coordination view with a Section Box around the primary control grid; place Spot Coordinates on the same grid points used in 2D plans.
  • Verify Northing/Easting and angle to True North against the survey control report.
  • Confirm all discipline models report identical coordinates at identical points (± tolerance defined in your BIM Execution Plan).
• Common pitfalls to avoid:
  • Unclipping and moving the Survey Point to “fix numbers.” Instead, use Specify Coordinates at Point.
  • Switching link positioning modes mid-project. After alignment, standardize on By Shared Coordinates.
  • Relying on eyeballing model overlaps. Always place Spot Coordinates and compare numerically.
• Documentation and handover:
  • Publish coordinates back to linked models (Manage > Coordinates > Publish Coordinates) when you own the master survey.
  • Include a “Coordinate Verification” sheet showing Spot Coordinates, rotation to True North, and control point IDs.
  • For IFC, set Export Base Point to Shared Coordinates and validate in a viewer before issuing.
• Advanced tips:
  • Use Dynamo to extract element XYZ and cross-check against survey control CSVs for batch verification.
  • Lock down PBP/SP with view filters and pinning; add a warning note in templates to prevent accidental edits.

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