Explore how 3D scanning supports crime scene documentation, from choosing FARO scanners to processing, analysing and sharing captured data.
Choosing the right scanner is important. So is understanding what happens to the data afterwards. One of the advantages of 3D scanning in crime scene documentation is the ability to revisit a scene digitally, long after the physical location is no longer accessible.
But capturing a detailed point cloud is only part of the picture.
That data may later be used to check measurements, examine spatial relationships, develop diagrams or create visualisations. It may also need to be combined with photographs and other information, then shared with people who don't use specialist scanning software.
Imagine documenting a building with several rooms, corridors and connected spaces. Capturing the overall layout with a stationary scanner involves setting up at multiple positions and combining those scans afterwards.
A mobile system such as FARO Orbis Premium offers a different approach. It captures 3D data as the operator moves through the environment, making it useful for covering connected spaces without repeated stationary setups.
Now consider a smaller area where detailed measurements of surfaces, objects or distances are the priority. FARO Focus Premium, a terrestrial laser scanner, is better suited to applications requiring higher measurement accuracy and detailed geometry.
It's a practical trade-off. Mobile scanning offers speed and flexibility across larger or connected areas. Terrestrial scanning is often preferred when higher-accuracy measurement is the priority.
In some applications, both approaches can be useful: mobile scanning for broader coverage and terrestrial scanning for areas requiring greater detail.
The decision isn't simply about which scanner has the longest range or the highest accuracy specification. It's about what needs to be captured, at what level of detail, and how the resulting data will be used.
Once a scene has been scanned, the data needs to be prepared for use.
For terrestrial scanning, this typically involves registering individual scan positions into a combined point cloud. The resulting dataset can then be viewed, measured and used in other applications.
FARO SCENE provides tools for processing and registering laser scan data.
But point clouds are rarely the only source of information.
Take a large outdoor incident scene. A terrestrial scan may provide detailed 3D geometry, drone imagery may show the wider surroundings, and photographs may capture details that are easier to examine in an image.
Each source has a purpose. The challenge is bringing the information together in a way that makes sense.
If datasets aren't properly aligned, features may appear in different positions across the combined information. That can affect measurements and the usefulness of the resulting visualisation.
Software compatibility, file formats and the ability to work with multiple information sources therefore deserve attention alongside scanner specifications.
For organisations using several capture methods, it's worth understanding what each software application can work with and how information will be managed across the wider workflow.
3D scanning can generate substantial amounts of data, particularly when several scan positions, images and processed outputs are involved.
In forensic applications, managing that information requires care.
An original scan file, a registered point cloud and an exported diagram serve different purposes. Keeping source data separate from processed outputs helps maintain clarity about what has been captured and what has been produced from it.
Access is another consideration. Some users may need to work directly with the point cloud, while others only need to view particular areas or review a report.
FARO SPHERE XG provides a cloud-based platform for viewing, managing and sharing reality capture information.
For organisations evaluating data management software, it's useful to consider how information will be stored, accessed and shared, alongside their own requirements for evidence handling and record management.
The aim is to make captured information available to the people who need it, without losing track of the underlying data.
A point cloud records the surfaces captured by a scanner. It provides a spatial reference that can be used for measurements, diagrams and further analysis.
A reconstruction goes beyond that measured geometry.
For example, a 3D model of a room can show the position of walls, doorways and other fixed features. Software can also be used to examine a line of sight from a particular position.
But the scan alone cannot establish everything that was visible at a specific moment. Lighting, movement and temporary obstructions may not be represented in the captured data.
The distinction between recorded geometry and additional interpretation matters when considering reconstruction software.
FARO Zone 3D Expert Plus provides tools for developing forensic diagrams, 3D reconstructions and visualisations using scene information.
A visually convincing reconstruction isn't necessarily an accurate one. The quality of the result depends on the information and methods behind it, not simply what the software can display.
For teams comparing analysis tools, it's useful to understand the types of diagrams and visualisations they can produce and the information needed to create them.
Not everyone who needs to review scene information will be working with point clouds.
A technical specialist may need access to the 3D data and measurement tools. Someone else may only need a scaled diagram, an annotated view or a way to understand the layout of a complex environment.
Common outputs include:
- Scaled 2D diagrams showing dimensions and spatial relationships.
- Annotated 3D views highlighting locations or features of interest.
- 3D visualisations and animations illustrating environments or spatial scenarios.
- Digital reports and shareable files that allow information to be reviewed outside the original scanning software.
The intended outputs influence the software requirements just as much as the capture itself.
There's little benefit in collecting detailed 3D data if it becomes difficult to access, work with or communicate further down the line.
For organisations introducing 3D scanning or expanding an existing capability, equipment is only one part of the decision.
How the data is processed, what other information it needs to work with, which analysis tools are available and how results will be shared are all worth considering from the outset.
At Synergy Group, we help organisations understand the differences between FARO scanning technologies and explore equipment and software options for their applications.
Considering 3D scanning for forensic applications? Talk to our team about your requirements or arrange a demonstration to see the technology in action.
Note: This article discusses 3D reality capture technology and its applications. Forensic evidence collection, analysis and presentation should follow applicable procedures, standards and legal requirements.