Orthophoto generation Photogrammetric Remote Sensing

Aerial photogrammetry is a technique for creating two dimensional (2D) or three dimensional (3D) models from high points. The images used in aerial photogrammetry are usually taken by using cameras which are placed on the underside of aircrafts. In this techniques tow or more photos of same areas with different angles are used. Aerial triangulation is the technique used here. It is mostly used in topographical mapping Aerial Triangulation in Photogrammetry

Orthorectification transforms the central projection of the photograph into an orthogonal view of the ground, thereby removing the distorting effects of tilt and terrain relief. The by-product of orthorectification process is orthoimage or orthophotos. Orthophoto Generation

The photographs obtained from color infrared aerial photography film is called Color Infrared orthophoto ( CIR ). It is commonly used used to study vegetation coverage, crop coverage, forest plantation studies, forest landuse etc mainly recording the chlorophyl content and in some of the GIS applications. Color Infrared Orthophoto

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