Performance of aerial triangulation based on airborne GPS data
Anuar Ahmad & Hamed Karimian
Photogrammetry is a three dimensional (3D) coordinate measuring technique that uses photographs as the fundamental medium for metrology or measurement. It is also famous known as non-contact measurement technique. Photogrammetry has evolves from analog method to analytical method and currently embraces digital system. Digital photogrammetric system employs sophisticated software to automate the task associated with conventional photogrammetry, thereby minimizing the extent of manual interaction required to perform photogrammetric operations. Today, there are many digital photogrammetric systems available in the market which is based on work station or personal computer. The user of photogrammetry has many choices to select the appropriate digital photogrammetric system to suit their needs. Basically, all digital photogrammetric systems involved the use of digital aerial photograph in producing photogrammetric output such as contour line, digital map, digital terrain model and orthophoto. All these output could be obtained within short period of time, accurate, save cost and save time. There are many processes in aerial photogrammetry such as aerial triangulation, stereo digitizing and generation of contour line, digital terrain model and orthophoto. The aerial triangulation is the most important process where if it is performed successfully then all photogrammetric products could be produced successfully too and vice-versa. Aerial triangulation is a process in which a mathematical relationship between the aerial photographs, the camera or sensor model and the ground is established.
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