Measure a large structure with a camera

A coordinate measuring machine needs the part to come to it. Photogrammetry works the other way round: the camera goes to the structure, and the measurement is reconstructed from the photographs afterwards.

That makes it the practical choice for large assemblies, field deployments and anything that cannot be moved, from a bridge under load to an aircraft section on the shop floor. Trilion deploys TRITOP for portable coordinate measurement and ARGUS for optical forming analysis.

A single photograph tells you the direction from the camera to each feature, but not how far away it is. Photograph the same feature from a second position and the two directions intersect at one point in space. That intersection is the measurement.

Repeat that across dozens of photographs and thousands of features, and the result is a dense set of 3D coordinates with known accuracy.

The final step refines the camera positions and the 3D point positions together, rather than one after the other. The solver adjusts the whole network until the rays from every camera agree on where each point sits, minimizing the leftover error across all of them simultaneously.

That joint solution is what turns a set of snapshots into traceable measurement, and it is where the accuracy figure on a photogrammetry report actually comes from. Scale bars and coded targets anchor the result to real units.

Large structure deformation under load, alignment and as-built verification, tooling and fixture inspection, antenna and reflector shape measurement, and sheet metal forming analysis with ARGUS.

It also pairs with Digital Image Correlation on the same test: photogrammetry provides the global reference frame across a large article while DIC resolves full-field strain in the areas that matter. Common across aerospace, civil engineering and automotive programs.