Close Range photogrammetry is a technique where photographs are used to build an accurate 3D model of an object. One notable advantage of photogrammetry is the extremely high accuracy (sub 0.01mm) results that can be achieved in certain conditions. Photogrammetry also allows us to measure and model areas not accessible to traditional survey methods or laser scanning.
Tritan has completed numerous such projects, the most notable being the survey of the damaged breakwater of the Calshot Harbour on Tristan Da Cuhna. The Titan Helicopter from the SA Agulhas was used as the camera platform to capture images of the breakwater from the seaward side.
Photogrammetry is versatile in that the photographs can be captured from many platforms, including aerial, mobile vehicles, handheld and tripods. This allows great versatility in the uses of photogrammetry and the areas where it can be used.

Photogrammetry can be used, among other applications, to achieve:

• Small and large object modelling
• Open terrain surveys
• Man-made structure modelling
• Flatness checks and precise measurements
• Orthorectified, scaled imagery