Key 3D scanning & BIM terms, defined

Point cloud

A point cloud is a dense set of 3D data points captured by a laser scanner, each with precise X, Y, Z coordinates, that together form an accurate digital model of a space or object.

Reality capture

Reality capture is the process of digitally recording existing physical conditions — via laser scanning, photogrammetry, or 360° imaging — to create measurable, true-to-life 3D data.

Registration

Registration is aligning multiple individual scans into one unified coordinate system so the combined point cloud is accurate and seamless. Survey-grade registration is typically 2-4 mm.

Level of Development (LOD)

LOD describes how detailed and reliable a BIM element is, from LOD 200 (generalized geometry) to LOD 350 (accurate, coordinated elements with interfaces between systems).

As-built drawing

An as-built drawing is an accurate 2D CAD drawing documenting a building exactly as it currently exists, typically produced from a laser scan rather than the original design intent.

Record drawing

A record drawing is a design drawing marked up to show changes made during construction — it reflects reported changes rather than an independent measurement of actual conditions.

Scan-to-BIM

Scan-to-BIM is the workflow of converting a laser-scan point cloud into an intelligent Revit/BIM model of an existing building.

360° virtual tour

A 360° virtual tour is an interactive set of panoramic images (often Matterport-style) that lets viewers walk through a space remotely.

3D laser scanning terms

LiDAR

Light Detection and Ranging — a laser method that measures distances by timing reflected light pulses to capture precise 3D data.

Terrestrial laser scanner (TLS)

A tripod-mounted scanner that captures high-accuracy 3D data of buildings and sites from fixed positions.

Control points / targets

Reference markers placed in a scene to align and georeference scans accurately.

Scan resolution / density

How closely spaced captured points are; higher density means finer detail.

Occlusion

Areas hidden from the scanner’s line of sight that need extra scan positions to capture.

Georeferencing

Tying scan data to a real-world coordinate system.

E57 / RCP

Common point-cloud file formats (E57 open standard; RCP for Autodesk ReCap) for sharing and importing scan data.

Accuracy vs precision

Accuracy is how close measurements are to true values; precision is how repeatable they are.

As-built documentation terms

Existing conditions

The current, real-world state of a building or site.

Field verification

Confirming measurements against the actual building — here, via survey-grade laser scan.

Floor plan

A scaled top-down drawing of a level showing walls, rooms, and openings.

Reflected ceiling plan (RCP)

A drawing of the ceiling as if reflected on the floor, showing lights, grids, and fixtures.

Elevation

A scaled drawing of a vertical face of a building.

Section

A drawing showing a building as if cut vertically to reveal internal structure.

BOMA / rentable area

Standardized methods for measuring floor area for leasing and space planning.

DWG / DXF

Standard AutoCAD file formats for CAD drawings.

Titleblock / layer standards

Drawing conventions — borders, metadata, and layer naming — that as-builts follow.

Scan-to-BIM terms

BIM (Building Information Modeling)

An intelligent 3D model of a building made of data-rich, object-based elements.

Revit

Autodesk’s leading BIM software for creating building models.

Family / component

A reusable, parametric BIM object such as a door, window, or fixture.

Clash detection

Automatically finding conflicts between building systems in a coordinated model.

Federated model

A combined model that links separate discipline models (architectural, structural, MEP).

MEP

Mechanical, electrical, and plumbing systems.

Navisworks

Software for reviewing and clash-testing combined BIM models.

LOA (Level of Accuracy)

How closely the model matches the measured point cloud.

Parametric model

A model whose elements are driven by adjustable parameters and rules.

Virtual tour terms

Matterport

A popular platform and camera system for capturing 3D virtual tours and dollhouse views.

Panorama

A wide or 360° image stitched from multiple photos to show a full surrounding view.

Dollhouse view

A 3D doll's-house-style overview of an entire scanned space, showing its layout at a glance.

Photogrammetry

Creating 3D models or measurements from overlapping photographs.

Point-to-point navigation

Moving through a virtual tour by jumping between fixed capture positions.

Walkthrough

A first-person, navigable path through a space in a virtual tour.

Equirectangular image

The flattened 2:1 image format used to store 360° panoramas.

Hotspot / tag

A clickable marker in a tour that reveals information, links, or media.

Field of view (FOV)

How much of a scene is visible from a given viewpoint.

Immersive / VR headset viewing

Experiencing a tour in stereoscopic 3D through a VR headset.

How the methods compare

3D laser scanning vs traditional measuring

Traditional tape or total-station measuring captures a limited number of points by hand and is slow and error-prone on complex sites. 3D laser scanning captures millions of precise points in minutes, producing a complete, verifiable record of existing conditions.

Matterport vs LiDAR laser scanning

Matterport-style cameras are fast and great for 360° visualization and rough dimensions, but survey-grade LiDAR laser scanning delivers far higher accuracy (typically 2-4 mm) suitable for design, fabrication, and as-built documentation.

As-built vs record drawings

Record drawings are marked-up design drawings; the as-builts we produce are independently field-verified from a laser scan of the actual building, making them far more accurate.

Point cloud vs BIM model

A point cloud is raw measured data — millions of points. A BIM model is an intelligent, object-based 3D model (walls, doors, MEP) built from that point cloud, with data you can schedule and coordinate.

Scan-to-BIM vs 2D as-builts

2D as-builts give you accurate drawings; scan-to-BIM gives you a coordinated 3D model with embedded data for clash detection, renovation design, and facility management.

Frequently asked questions

What is the most accurate way to document a building?

Survey-grade 3D laser scanning, which captures millions of measured points and registers them to 2-4 mm accuracy.

Do I need a point cloud, as-builts, or a BIM model?

It depends on your goal: a point cloud for raw reference, 2D as-builts for drawings, or a scan-to-BIM model for coordinated 3D design and data.

Is laser scanning better than Matterport?

For accuracy and design use, yes — LiDAR laser scanning is far more precise. Matterport excels at fast 360° visualization.

How accurate is 3D laser scanning?

Survey-grade scanning typically achieves 2-4 mm registration accuracy.

What areas does CAD Construct LLC serve?

Pittsburgh and Western Pennsylvania, with travel available for larger projects.

Need existing conditions documented accurately?

Talk to CAD Construct LLC about 3D laser scanning, as-built drawings, and scan-to-BIM across Pittsburgh & Western PA. Contact us or call (800) 967-2627.

Related services

All 3D scanning, as-built, scan-to-BIM and virtual tour terminology is now consolidated on this page. To see the services behind these terms, visit 3D laser scanning, as-built documentation, scan-to-BIM and 360° virtual tours.