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Utilizing Drones to Create Professional Quality 3D Models

Utilizing Drones to Create Professional Quality 3D Models. Vance Moore, Garrett & Moore. What are Professional Quality 3D Models?. Dense Point Clouds 3D Polygonal Mesh (Triangulated Irregular Network, or TIN) DEM- Digital Elevation Model

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Utilizing Drones to Create Professional Quality 3D Models

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  1. Utilizing Drones to Create Professional Quality 3D Models Vance Moore, Garrett & Moore

  2. What are ProfessionalQuality 3D Models? • Dense Point Clouds • 3D Polygonal Mesh (Triangulated Irregular Network, or TIN) • DEM- Digital Elevation Model • DSM - Digital Surface Model. Data includes vegetation, structures, etc. • DTM - Digital Terrain Model. Data removes vegetation and structures (i.e. bare earth) • Orthomosaic • Image that can be used to measure true distances.

  3. FAA Regulations (Part 107) Small Unmanned Aircraft Requirements • Remote pilot airman certificate (commercial) • Must keep your drone within sight • Maximum allowable altitude is 400 feet above the ground (higher if your drone remains within 400 feet of a structure) • Can’t fly over anyone who is not directly participating in the operation. • Avoid manned aircraft

  4. Modelling Process • Turns camera based images to accurate, georeferenced 2D maps and 3D models. • Do not crop or geometrically transform, i.e. resize or rotate, the images. • Using RAW data losslessly converted to the TIFF. • JPG compression may induce unwanted noise to the images.

  5. Equipment – Digital Camera • Appropriate Resolution • Appropriate focal length • Fixed lenses are preferred. • Avoid ultra-wide angle and fisheye lenses. • Sufficient Shutter Speed to Avoid Blur

  6. “Fisheye” Lens • Commonly found on the GoPro camera • Causes a warped look Original“De-Fished”

  7. Equipment - Drone • Sufficient Payload & Flight Time • Programmable Flight Paths • Programmable Camera Triggering

  8. Image Geometry

  9. Image Geometry Image Length Image Width Flight Direction

  10. Image Geometry • Sony R10C Camera (20 MP) • Sensor Length = 23.6 mm (5,456 pixels) • Sensor Width = 15.7 mm (3,632 pixels) • Focal length = 20 mm

  11. Image Geometry - R10C Flight Path

  12. Image Geometry - R10C Flight Path (Into Page)

  13. Image Geometry - R10C ~ 400 Ft Image Length ~ 470 Ft Image Width ~ 312 Ft

  14. Ground SampleDistance (GSD) • The Ground Sampling Distance (GSD) is the distance between two consecutive pixel centers measured on the ground. • The higher the altitude of the flight, the bigger the GSD value. • The bigger the value of the image GSD, the lower the spatial resolution of the image and the less visible details.

  15. Ground SampleDistance (GSD)

  16. Ground SampleDistance (GSD) (~400 Ft) • Camera resolution effects on GSD GoProR10C

  17. Modelling Process • Objects to be reconstructed must be visible on at least two photos. • In case of aerial photography, ~75% forward image overlap and ~60% side image overlap • Flight Path will have straight and parallel flight lanes for pictures to ensure picture overlap

  18. 75% Forward Image Overlap

  19. 75% Forward Image Overlap @400FT Flight Height Flight Path

  20. 60% Side Overlap

  21. 60% Side Overlap@400FT Flight Height Flight Path (Into Page) Flight Path (Out of Page)

  22. Planning a Mission • Determine area to be modeled • Determined desired model accuracy (flight height) • Frequency of Pictures (Forward Overlap) • Number of flight paths (Side Overlap) • Location for the flight takeoff point • Minimum and maximum heights above surface. • Control Panel Layout

  23. Target Area Example

  24. Choosing the Correct Take Off Point • Choosing the correct take off point will allow you to make the flight as efficient and effective as possible • Choose a point as roughly as close to the middle as possible while picking a balance between a high and low take off point • Getting the right location will save flight time, and get the best picture quality (coverage and resolution)

  25. High Take Off Point Side Overlap Flight Path (Into Page) Flight Path (Out of Page)

  26. Low Take Off Point Side Overlap Flight Path (Out of Page) Flight Path (Into Page)

  27. High Take Off Point Forward Overlap Flight Path

  28. Low Take Off Point Forward Overlap Flight Path

  29. High vs Low Take Off Point High Take-Off Point • Pros: • Adequate Image Overlap • Fewer Images • Larger area coverage for flight time • Cons: • Lower GSD • Low Take-Off Point • Pros: • Higher GSD • Cons: • Image Overlap Issues? • More Images • Less area coverage for flight time

  30. Control Points • The model’s accuracy depends on the number, distribution, and measured accuracy of the GCPs. • Relative Accuracy : Defined by comparing individual features on a map / reconstructed model / orthomosaic with other features on the same model. (Site Control) • Absolute Accuracy : Defined by the difference between the location of features on a map / reconstructed model / orthomosaic and their true position on the Earth.

  31. Control Point Example

  32. Imaging Process

  33. Final Product • https://youtu.be/PnSU2d_yPS0

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