Photogrammetry is the technique of taking reliable measurements of the objects using aerial photographs or satellite imagery. In Photogrammetry, stereopairs are the basic requirement for 3D compilation work. The overlapping part of two consecutive photographs is known as a stereopair or a model that can be viewed  and consequently mapped in 3D using one of following techniques:
Analogue
Analytical
Digital

Photogrammetry is the art, science or technique of obtaining  reliable information about physical objects and environment  through process of recording, measuring and interpreting  photographic images and patterns of electromagnetic radiant   energy and other phenomenon.” (Wolf)

Principally, photogrammetry can be divided into:

• Aerial photogrammetry (mostly far range photogrammetry), and
• Terrestrial Photogrammetry (mostly close range photogrammetry).

SGS Infotech Pvt. Limited has been providing services and solutions in digital photogrammetry for last six years. With extensive experience at the management level, highly qualified, well trained and skilled staff along with the latest equipment/software, SGS Infotech Pvt. Limited is well equipped to provide the full range of services in digital photogrammetry on Aerotriangulation, Digital Terrain Modeling, Planimetric Mapping & Orthophoto Generation