Technical Reference: Data Priority Protocol for Conflicting Scan and Drawing Sources

Context

Project 291.US required modeling a 14,500m² US supermarket from two overlapping data sources: high-density point cloud and 2D technical drawings. The two sources frequently disagreed — a consequence of on-site construction deviations and post-occupancy modifications not captured in the original drawings.

Protocol

When point cloud and drawing data conflict within the same spatial region, apply the following ordered rules:

Rule 1: Both Sources Available

• Geometry: Derive from point cloud (reflects as-built reality)
• Technical parameters: Derive from drawings (reflects design intent and specifications)
• Example: A wall modeled at the scan-measured thickness of 300mm, with its fire-rating and material composition taken from the drawing schedule.

Rule 2: Drawings Only (No Scan Coverage)

• All attributes: Position, dimensions, and technical parameters follow the drawings exactly
• Applies to: objects inside walls, under-slab plumbing, foundation systems where scanning is impossible

Rule 3: Scan Only (No Drawing Coverage)

• Geometry: Derive from point cloud
• Technical parameters: Infer from adjacent objects and structural logic of the building
• Applies to: undocumented modifications, ad-hoc installations added during the building's operational life

Family Library Workflow

The client required use of pre-established Revit families. When a required family did not exist or did not match scan geometry:

1. Search the categorized family inventory (organized by discipline → sub-group)
2. If no match: submit a family creation request to the client
3. If the client cannot deliver within the schedule window: ViBIM develops the family in-house
4. New families are added to the categorized inventory for reuse across the project series

Multi-Volume Coordination

The supermarket spans seven distinct site volumes. Modeling workflow:

• Volume segmentation → Parallel discipline modeling per volume
• Merge into federated Revit model → Clash detection
• QA/QC via Autodesk Construction Cloud

Team members were assigned exclusive work zones to prevent ownership conflicts during simultaneous ACC sessions. Time-zone offset (Vietnam ↔ US) was managed through asynchronous handoffs with documented change logs.

Technical Specifications

https://vibimglobal.com/projects/revit-modeling-for-supermarket-at-us/

Reference: https://vibimglobal.com/projects/revit-modeling-for-supermarket-at-us/

See more:

• https://vibim.tumblr.com/post/827723023330246656
• https://vibim.wordpress.com/2026/09/14/revit-modeling-for-supermarket-at-us/