Technology comparisons: choosing the method, not just the device

Every comparison here comes down to the same two questions: how far away is the thing you have to measure, and how fine is the detail that decides the case.

Twelve topics below, grouped into the comparisons, the figures, and what it takes to deploy.

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Artec Ray II long-range laser scanner on a tripod

Range against detailThe one trade every choice on this page turns on.
Figures at a stated distance"High accuracy" is not a number until a range is attached to it.
Validated before useA method is not yours until it is proven on known references.
Deployable by your teamA device nobody is trained on documents nothing.

Method comparisons

Two ways of recording the same scene, compared on what actually decides it.

Handheld vs Terrestrial ScannerRange against detail, and why most units run both.Structured Light vs LiDARTwo light sources, two jobs, one scene.3D Scanning vs Photography26 minutes against 54, and geometry against appearance.3D Scanning vs PhotogrammetryScale, control and what each one needs at the scene.3D Scanning vs CastingUnder a minute against 24 hours, and nothing touched.Laser Scanner vs Total StationA surface against a handful of very accurate points.Professional Scanner vs Smartphone LiDARWhere a phone stops being evidence.

Figures and choosing

What the numbers mean, which device fits, and what it costs.

Forensic Scanning AccuracyWhat the figure means, and at what distance it was measured.Choosing a Forensic ScannerThe four questions that decide it.Forensic Scanner CostWhat drives the number, and what it replaces.

Getting it into service

Proving the method and getting a unit working with it.

Validation & SOPProving the method before it is used on a case.Training & DeploymentHow long until a unit is working unsupervised.

Why the comparison is never device against device

A handheld scanner and a terrestrial one are not competitors; they answer different questions about the same scene. A stain pattern needs 0.05 mm on a wall you can reach. The room that pattern sits in needs range and a full spherical field. Most units end up running two devices for exactly this reason, and the interesting question is which two.

The comparisons against older methods work the same way. Photography records appearance and 3D records geometry — the University of Toronto study measured 26 minutes against 54 and produced submillimetre-accurate colour documentation photographs cannot replicate. Casting captures an impression once, destructively, over 24 hours; a scan captures it in under a minute and leaves it intact.

Measured, not asserted

26 vs 54 minFull documentation: 3D scanning against forensic photographyUniversity of Toronto comparison study

Under 1 minA footwear impression, against 24+ hours for a dental stone castDocumented Artec 3D case

1.9 mm at 10 mAccuracy at a stated distance — the only way to read the figureArtec Ray II

What the light source decides

No dependence on scene lighting: The scanner brings its own structured or laser light, day or night.
Range where access is the problem: Up to 130 m from a tripod, for ground you can safely stand on.
Detail where the case is decided: 0.05 mm in the hand, on the surface as found.
A figure you can cite: Accuracy stated with the distance it was measured at.

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Questions that come up first

Which is better, handheld or terrestrial?

Neither, on its own. Terrestrial gives you range and a full scene; handheld gives you the fine detail within arm's reach. Most forensic units run one of each, and pick per scene rather than once.

Is a phone with LiDAR good enough?

For a rough spatial note, sometimes. For evidence, the questions are what accuracy it states at what distance, whether it can be validated against references, and whether the method can be written into an SOP and defended. That is where a professional instrument is a different class of tool.

How should we read an accuracy figure?

Always with the distance attached. Artec Ray II states 1.9 mm at 10 m and 5.3 mm at 40 m; Spider II states up to 0.05 mm at close range. A figure without a range is not comparable to anything.

What does deployment actually involve?

Validation against known references, capture and processing training, and writing both into your procedure. Most investigators handle basic scanning after a few days of practice; the paperwork around it is what takes planning.

Other areas of forensic 3D work

Crime Scene InvestigationScene capture, reconstruction, bloodstain and line-of-sight analysis EvidenceFootwear and tire impressions, toolmarks, ballistics, small evidence Human Remains & PathologyAnthropology, skeletal trauma, autopsy and wound documentation Accidents & IncidentsTraffic collisions, fire and arson, explosions, structural collapse Court & LegalCourtroom 3D evidence, expert testimony, chain of custody Software & WorkflowPoint cloud processing and the scene-to-courtroom pipeline Solutions by ProfessionLaw enforcement, laboratories, examiners, reconstructionists, courts

Tell us about the work you do

A forensic application specialist will come back with the device that fits it, the accuracy to expect, and how the data reaches your existing case workflow.