# Plain definitions for every site term.

Spatial Summit Group

https://spatialsummitgroup.com/glossary

Updated 2026-11-01. Access: invite-only.

TRACE organizes each building or property as a Site, a dated walkthrough as a Visit, and an accepted 3D reconstruction as a Record. These terms keep the spot, the date and the review status distinct.

![A frame from a 360 walk wipes to the warehouse record at the same spot, then the camera rises over the stock](https://spatialsummitgroup.com/landing/media/film-replay.webp)

Visit playback.

[4,138 training views · 2026-09-16](https://spatialsummitgroup.com/methodology#measurements) — Warehouse dataset · 4,195 registered views; 57 reserved for evaluation.

## Record

An accepted spatial reconstruction that an operator can inspect for a Visit.

TRACE opens each accepted record in the browser.

## Visit

A dated trip to a Site, created by a person with the date they choose.

Uploads and their results attach to that Visit. Upload time and camera time do not silently replace its date.

## Site frame

The common coordinate frame used to relate a Site’s Visits.

Each visit is lined up with the site’s reference once a person accepts the match.

## Camera path

The camera’s estimated positions and orientations at sampled times in a clip.

TRACE derives paths from placed keyframes. Unobserved intervals are not independently solved positions.

## 4D playback

A Visit’s footage played in sync with its camera path inside the 3D Record.

Follow the camera, look around freely, or view the visit from above.

## Held-out view

An image reserved from training to evaluate the resulting reconstruction.

TRACE checks evaluation splits and per-view scores. The warehouse example is pose-assisted; withheld training images do not imply independent camera estimation.

## SOG

A compressed Gaussian scene format used to deliver a Record to the browser.

A checked SOG rendition serves the Record; the accepted PLY retains its identity. Export fidelity and reconstruction quality are separate measurements.

## Gaussian splatting

A 3D representation made of many spatial Gaussian elements whose appearance is blended to render a view.

TRACE trains its records from the placed images of each visit.

## Questions, answered.

### Is a Record the entire history of a Site?

No. A Record is an accepted reconstruction for a Visit. Site history is the collection of Visits, Records, Sources, Findings and work over time.

## Sources and access

[Methodology and dated measurements](https://spatialsummitgroup.com/methodology)

[Machine-readable capabilities](https://spatialsummitgroup.com/capabilities.json)

[Request access](https://spatialsummitgroup.com/#access).