How we measure venues

Every venue page is built from the venue's own materials: published floor plan drawings, capacity charts, and spec sheets, or files a venue shares with us directly. We extract facts — dimensions, geometry, capacities — and never republish a source rendering. We do not copy data from other diagramming platforms' venue libraries, ever. Each page lists its sources in the “About this data” section.

Rooms are traced to their actual perimeter — vestibules, alcoves, and door bays included — never simplified to a bounding box. When a source drawing has a vector layer we read the exact paths; otherwise the perimeter is traced from the drawing and snapped to a 3-inch grid. Doors, columns, and airwall lines are placed where the drawing shows them.

A room that divides by airwall is drawn once; every section and combination on a page derives from that single to-scale drawing, so the numbers can't drift apart the way separately-drawn variants do.

Scale is established two independent ways before a plan is accepted: the drawing's own scale bar, cross-checked against objects of known size in the drawing (a 60″ round table is 5 feet across; an 8′ banquet table is 8 feet). If the two disagree by more than 3%, the plan stops and the discrepancy is resolved — it does not publish. The evidence for each check is recorded and shown on the venue page under “Scale verification.”

Capacity charts show only figures the venue itself has published or confirmed to us — banquet, reception, theater, classroom, boardroom, and the rest. We never estimate a capacity number. If a venue hasn't published capacities, the page simply doesn't show a capacity chart. Actual counts always depend on staging, dance floors, AV, and local fire code — which is why every room can be opened as a live diagram to see what really fits.

Every space carries a provenance level, shown on its page:

• From the venue's published materials — dimensions and layout imported from published specs.
• Traced from the venue's floor plan — full perimeter geometry traced to scale from the venue's drawings.
• Confirmed with the venue — the venue has reviewed and confirmed the plan.
• Measured on site — dimensions verified by physical measurement.

Software — including AI vision models — assists the extraction: reading vector paths, proposing feature labels, flagging disagreements between the drawing and the venue's published spec sheet. Nothing a model proposes is trusted blind: extracted geometry is overlaid on the source drawing and verified, disagreements go to a person, and no venue publishes to the registry without explicit human review and approval by a named reviewer of record. Known limitations are published, not hidden — each page's “About this data” section lists its caveats, because an honest unknown beats fabricated data.

Spotted an error? Tell us and we'll fix it against the sources. Venues can claim their listing free to manage it directly — claimed venues are marked “Verified — managed by the venue.” Every page shows when it was last updated.