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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.
Sections
Graphical radial triangulation is a technique used in photogrammetry to accurately position photographs using simple instruments.
Block triangulation enhances internal strength and accuracy compared to strip triangulation methods in photogrammetry.
This section details the six orientation parameters necessary for aerial triangulation and explains how control points help determine these parameters.
Bundle adjustment is an essential algorithm in triangulation that adjusts all photos simultaneously to create an accurate spatial model using light ray intersections.
Photogrammetric mapping involves using aerial photography and photogrammetric techniques to measure and analyze land for topographical mapping, curating essential data through methods like mosaicing and digital imagery.
This unit provides an overview of photogrammetry, covering key concepts and methods in graphical and aerial triangulation.
This section outlines a series of solved examples that demonstrate the principles and applications of photogrammetry, particularly focused on calculating scales, flying heights, and lengths of lines on photographs.
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.
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.
Stereo-plotting
The process of creating 3D models from two overlapping aerial images through stereoscopic vision.
Practice Exercises
Total Questions
2
Estimated Time
4 min
Passing Score
70%
Instructions
- Read each question carefully
- You can use hints if you need help
- Complete all questions before submitting
1 more question available
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