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Quiz – Scaling and Measurement

April 14, 2023 SimonBrown

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Question 1 of 10

1. Question
What is the difference between global and local registration?
- Global registration adds both scaling real-world geo referencing, while local registration does not.
- Global registration is only used when geo referencing is technically challenging, while local registration is used when geo referencing is necessary.
- Global registration adds scaling and variable anchors, while local registration adds fixed anchors.
- Global registration adds scaling, georeferencing and constraints from a global coordinate system, local registration adds scaling and constrains to a local markers.
Question 2 of 10

2. Question
Why is the “From Images” method the most accurate and recommended method for adding GCPs in Zephyr photogrammetry software?
- It can be automated allowing hands free project delivery.
- It is the fastest method.
- It allows the user to place GCPs on the source images, which is the most accurate method.
- It can be automated and scripted allowing the user to easily outsource projects.
Question 3 of 10

3. Question
What is reprojection error?
- The difference between the actual point location and the point location estimated by Zephyr.
- The difference between the actual point location and the point location estimated by the user.
- The difference between the actual point location and the point location estimated by the software used to take the images.
- The difference between the actual point location and the point location estimated by the GPS device used during the image capture.
Question 4 of 10

4. Question
What is the recommended reprojection error, in pixels, for most situations?
- <0.1
- <1.0
- <0.5
- <5.0
Question 5 of 10

5. Question
What is the benefit of using automatic placement for GCPs in Zephyr?
- It can be used to edit existing GCPs
- It saves time compared to manually placing GCPs on every image
- It guarantees higher confidence in GCP placement
- It works on all images in the bundle regardless of quality
Question 6 of 10

6. Question
What is the purpose of running the Align model with 3D Constraints?
- To automatically place GCPs in all potential images
- To tweak the camera positions and account for the location of added points
- To edit GCPs in the bundle
- To monitor the projection errors of the GCPs
Question 7 of 10

7. Question
Order these data sets in expected reprojection error from lowest to highest
- DSLR camera photos taken by a competent operator for historical documentation of a fossil
- Camera phone pictures of a statue collected on a bright sunny day.
- Drone images taken at 60m with a quality camera on an overcast, windless day
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Question 8 of 10

8. Question
Why is it important to run a bundle adjustment once the constraints have been added?
- The adjustment moves geolocations to fit with picked points
- The adjustment recalibrates cameras allowing best overall project accuracy
- The project is rerun excluding any low precision GCP
- The bundle adjustment creates a further set of coordinates to allow precise GCP placement
Question 9 of 10

9. Question
What factors can trigger deviation in distance measurements or positions?
- Human error
- Poor site conditions
- Recording mistakes
- Poorly functioning satellite positioning
- All of the above
Question 10 of 10

10. Question
What is the purpose of the Constraints Report?
- To identify where variations can be found in photo quality
- To understand the difference between a project and real world distance
- To assess projects for potential issues caused by imprecise scaling
- To reveal accuracy and potential errors in the project

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