Questions and Answers
What is the primary function of aerotriangulation?
Determining the X, Y, and Z ground coordinates of individual points based on photo coordinate measurements.
What is the practical minimum number of control points necessary in each stereomodel?
Aerotriangulation can completely eliminate the need for ground control.
False
What is one advantage of aerotriangulation over field surveying?
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Match the following methods of performing aerotriangulation with their descriptions:
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Aerotriangulation is often referred to as bridging because it develops a '_________' of intermediate control points.
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What method allows for the combination of aerotriangulation with kinematic GPS and INS?
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What is aerotriangulation?
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What is the minimum number of control points necessary in each stereomodel?
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Aerotriangulation can completely eliminate the need for ground control.
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Which of the following is NOT an advantage of aerotriangulation?
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What are the three categories of methods for performing aerotriangulation?
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Aerotriangulation is often referred to as _______ when extending ground control.
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Study Notes
Introduction to Aerotriangulation
- Aerotriangulation determines ground coordinates (X, Y, Z) of points from photo coordinates.
- Phototriangulation is a broader term applicable to both aerial and terrestrial photos.
- Enhanced equipment has improved accuracy in determining ground coordinates significantly.
- A major use is extending or densifying ground control via photo strips and blocks, often referred to as "bridging."
Control Points
- Minimum required control points for each stereomodel: three horizontal and four vertical.
- Extensive mapping projects necessitate a large number of control points to avoid high field survey costs.
- Aerotriangulation can establish control using limited field-surveyed points, resulting in cost savings.
Technological Advancements
- Kinematic GPS and INS can provide camera coordinates and angular attitude during photo capture.
- Theory suggests this method could eliminate the need for ground control, but practical applications still require minimal ground control for better accuracy.
Advantages of Aerotriangulation
- Conducted under controlled laboratory conditions, reducing weather-related delays.
- Requires less access to project property.
- Minimizes difficulties in field surveying in challenging terrains like marshes or steep slopes.
- Validates field-surveyed control, reducing risks of erroneous data during compilation.
Methods of Aerotriangulation
- Classified into three categories: analog, semianalytical, and analytical.
- Analog methods: manual orientation of photo models using stereoscopic instruments; enabled long strip models where coordinates could be directly read.
- Semianalytical techniques combine manual stereomodel orientation with numerical absolute orientation.
- Analytical methods involve photo coordinate measurement followed by numerical orientation to compute ground coordinates.
Pass Points
- Careful selection of pass points is critical; these points serve as reference positions in the aerotriangulation process.
Introduction to Aerotriangulation
- Aerotriangulation determines ground coordinates (X, Y, Z) of points from photo coordinates.
- Phototriangulation is a broader term applicable to both aerial and terrestrial photos.
- Enhanced equipment has improved accuracy in determining ground coordinates significantly.
- A major use is extending or densifying ground control via photo strips and blocks, often referred to as "bridging."
Control Points
- Minimum required control points for each stereomodel: three horizontal and four vertical.
- Extensive mapping projects necessitate a large number of control points to avoid high field survey costs.
- Aerotriangulation can establish control using limited field-surveyed points, resulting in cost savings.
Technological Advancements
- Kinematic GPS and INS can provide camera coordinates and angular attitude during photo capture.
- Theory suggests this method could eliminate the need for ground control, but practical applications still require minimal ground control for better accuracy.
Advantages of Aerotriangulation
- Conducted under controlled laboratory conditions, reducing weather-related delays.
- Requires less access to project property.
- Minimizes difficulties in field surveying in challenging terrains like marshes or steep slopes.
- Validates field-surveyed control, reducing risks of erroneous data during compilation.
Methods of Aerotriangulation
- Classified into three categories: analog, semianalytical, and analytical.
- Analog methods: manual orientation of photo models using stereoscopic instruments; enabled long strip models where coordinates could be directly read.
- Semianalytical techniques combine manual stereomodel orientation with numerical absolute orientation.
- Analytical methods involve photo coordinate measurement followed by numerical orientation to compute ground coordinates.
Pass Points
- Careful selection of pass points is critical; these points serve as reference positions in the aerotriangulation process.
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Description
This quiz covers Chapter 4 on Aerotriangulation from the IOE Pashchimaanchal campus curriculum. It includes topics such as single images, stereo pairs, strip triangulation, and various adjustment techniques. Test your understanding of the advantages and disadvantages of these methods.
