SVY2202 Photogrammetry and Drone Mapping Assignment 1 Question 2025 | UniSQ

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5. Assignment answers must be written in your own words. Avoid copy-and-paste scheme as plagiarism is taken very seriously. Use correct reference citations by using  the  Harvard  AGPS  referencing  style.There will be mark deduction for missing or improper referencing (refer to Marking Rubric for details).
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4. Do not provide references after each question. A full reference list should be provided in alphabetical order at the end of the Assignment document. 

SVY2202 Question 1 (120 marks)

The provided portrait image was captured using a smartphone camera equipped with a 5mm lens and a 1/2.3" sensor (6.17mm × 4.55mm) at a drone distance of 25 meters (d in figure 1) .

Using this information, determine: 

1. Compute the Field of View (FOV) (horizontal and vertical) , the base coverage (horizontal and vertical) for the given camera specifications at the given drone distance. 
2. Estimate the height of the drone above the ground using proportional measurements from the captured image. 
3. Calculate how the base coverage changes at decreasing distances (20m,15m,10m) and determine when the drone would no longer fit within the image frame. 
4. Repeat the calculations (1-3) using a different focal length (10mm) while keeping the same sensor size. 
5. Discuss how factors such as focal length and sensor size impact the ability to capture the drone at further distances.

Question 2 (80 marks)

A bridge appears on a pair of overlapping vertical photographs (1 and 2) as shown below:

(a) Determine the length and slope of the bridge from the following data and absolute parallax measurements.

The Known data includes:

• Flying height above mean terrain height is H-h=1600m 
• Air Base is B= 800.5m 
• Camera focal length, f or c = 152.5mm
• Measured image coordinates are given as:

b) If the camera focal length was changed to 200mm, how would the results differ? repeat the calculations and discuss how does an increase in focal length affect parallax, ground coordinates, and slope accuracy?

Question 3 (100 marks)

Calibration involves deriving various parameters crucial for accurate photogrammetric processing. This question focuses on camera calibration using the Agisoft Metashape software. The calibration process will encompass statistical and graphical assessments of the results, considering factors such as nominal focal length, pixel size, and the impact of calibration parameters, especially radial distortion, on ground coordinates and image scale.

Task Description:

1. Pre-calibration Preparation: 

• Source the following details for your camera: 
• Nominal Focal Length in mm 
• Pixel size in mm 

2. Calibration Process: 

• Utilise the Agisoft Metashape software for camera calibration. 
• Follow the provided video tutorial on accessing the software. 
• Adhere to Agisoft Guidelines for Calibration. 

3. Initial Calibration and Results: 

• Run the initial calibration with the 9-image set. 
• Analyse the calibration results, focusing on coefficients such as focal length, principal point coordinates, distortion coefficients, and affinity/non-orthogonality coefficients. 

4. Checking and Corrections:

• Check each image for corrected corners of the chessboard. 
• Evaluate the results for greyed corner colours indicating misalignment. 
• Consider deleting or re-imaging if there are significant misalignments. 

5. Comparison and Analysis: 

• Conduct calibrations for other sets (3, 6, 12 images). 
• Examine residuals and radial distortion graphs in Agisoft Metashape. 
• Compare calibrated focal length with the manufacturer’s specification.

Results and Conclusion: Compile a comprehensive discussion detailing the calibration process, the impact of the number of images on calibration results, and an analysis of the derived parameters. Discuss the practical implications of the findings and compare them against the manufacturer's specifications for the camera.

Question 4 (100 marks)

An aerial survey is planned to cover a 600m (E/W) by 200m (N/S) area using a camera with a focal length of 35mm, an image resolution of 24 MP (6000 × 4000 pixels), and a pixel size of 3 × 3 microns. The flight is designed to achieve a Ground Sampling Distance (GSD) of 3 cm/px while maintaining a 75% forward overlap and 65% side overlap between consecutive images. The aircraft is flying at a speed of 10 m/s.  Given the provided information, answer the following:

1. Flight Planning: 

o Determine the required flying height above mean terrain to achieve the specified GSD.
o Calculate the photo scale of the images captured.

2. Coverage Calculation: 

o How many flight runs (E/W) are required to ensure full area coverage? 
o How many photos per run (N/S) are needed to maintain the required overlap?