4. Graphical Radial Triangulation
This chapter delves into the processes involved in aerial triangulation and photogrammetry, emphasizing techniques for achieving accurate maps from aerial photographs. It explains the significance of ground control points, various types of aerial triangulation methods, and the use of different photogrammetric software. Additionally, it covers the creation of mosaics, orthophotos, and stereo-plotting instruments while highlighting the advancements in digital photogrammetry.
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Sections
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5.1.1Example 4.1
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5.1.3Example 4.3
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5.1.4Example 4.4
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5.1.5Example 4.5
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5.1.6Example 4.6
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5.1.7Example 4.7
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5.1.10Example 4.10
What we have learnt
- Graphical radial triangulation is essential for establishing accurate control points in aerial photogrammetry.
- Aerial triangulation methods can be categorized into analog, semi-analytical, analytical, and digital methods, each with unique advantages.
- Mosaics offer a continuous photographic representation with varying accuracy, and orthophotos provide geometrically corrected images for accurate readings.
Key Concepts
- -- Radial Triangulation
- A method used in photogrammetry to determine the position of points on the ground by forming radials from the principal point of photographs.
- -- Bundle Adjustment
- A technique in photogrammetry where multiple images are adjusted simultaneously to fit together, improving the accuracy of the 3D model.
- -- Orthophoto
- An aerial photograph geometrically corrected to have a uniform scale and serve as an accurate map substitute.
- -- Stereoplotting
- The process of creating 3D models from two overlapping aerial images through stereoscopic vision.
Additional Learning Materials
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