Photogrammetry is the science to derive 3D object information from a set of photographs.

Each image can be seen as an instantaneous recording of thousands of spatial directions.
By combining two or more images, and thus intersecting the bundles of spatial rays, the coordinates of object points, their quality, the positions of the camera, its orientations and the distortions introduced by the lenses can be calculated.

Monoscopic Photogrammetry uses convergent photographs that can be taken from a hand-held camera, making it easier, more flexible and more cost-effective for Close-Range Photogrammetry, than the more traditional stereoscopic methods, widely used for Aero-Photogrammetry.

In conjunction with Monoscopic Photogrammetry we use Orthophoto Rectification. With this technique, metric or normal photographs are scanned and rectified into a 2D scaled digital image retaining all the detail of the original photograph. The rectified image can then be used to produce a 2D line drawing for CAD use.

This system can be used to detail flat portions of the object of the survey, or can be used by itself to obtain, at a comparable very low cost, an accurate documentation of 2D objects like prints, paintings, mosaics, stained glass windows and artwork in general.