Aerial triangulation (AT) is an integral part prior to producing any photogrammetric products from Stereo images. It is a mathematical process to determine the position and orientation parameters (Exterior orientation) of the photographs at the time of exposure that is eventually used for orthophoto generation, at mapping and height model generation.

AT is a critical step related to the project's quality, and can be represented as the heart of all photogrammetric processes as the quality of the exterior orientation parameters and the scale of the photographs are the determining factors in the quality of the mapping products.

Aerial triangulation unit of Decode is well trained in the field and have long term exposure in working for large scale projects. The unit supports both analogue and digital camera photographs with GPS/INS data to optimise and guide the process.

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