These are the three sets of images that will be uploaded to the same bucket.
1. Birds Eye Shot (Nadir Images) - 3 Images
Capture three nadir (overhead) images with the entire roof in each image. Take the first picture at one end of the structure, the second at the center, and the third at the other end of the structure.
Left End of Structure
Center of Structure
Right End of Structure
2. Connecting Images - 4 Images
Connecting images are needed to correlate nadir images to oblique images. Before taking each picture, ensure the whole structure is in the frame by adjusting the gimbal.
For the structure in the example, just four connecting images are adequate. Keep in mind that bigger structures may require more connecting images. As a general rule of thumb, one connecting image should be captured every 15 – 20 feet between the center nadir and the first oblique image.
Here are some guidelines for capturing connecting images:
- Use the center nadir as a starting point.
- Determine where the first oblique image will be and visualize a straight line between the center nadir and the first oblique.
- Move the drone toward the first oblique, stopping about every 5 meters.
- At each stop, adjust the gimbal so the entire structure is in view.
- Snap the photo and move to the next connecting image until the first oblique location is reached.
Connecting Image 1
Connecting Image 2
Connecting Image 3
Connecting Image 4
3. Oblique Images (Orbit) - 16 Images
Oblique images require at least 50% overlap between images in order for the software to correlate them together. Each facet of the structure should be visible in at least three different oblique images. You will have to set a Point of Interest (POI) in the DJI Go App and use Orbit Mode to collect all 14 images.
Using the DJI GO App
- Capture the nadir images before starting the Point of Interest mode.
- Start the Point of Interest mode.
- Note that intelligent flight modes cannot be started until the drone is in flight and is higher than 16 ft above the home point.
- Fly the drone over the structure and center it relative to the structure, not the property.
- Adjust the elevation of the drone to the appropriate altitude. 75 ft is a good starting point.
- Set the Point of Interest.
- Do not fly directly to the radius you wish to fly at. It is best to take the connecting shots on the way.
- While flying to the appropriate radius (usually 75 ft) take connecting pictures every 15 - 20 ft.
- Adjust the gimbal before taking each connecting shot to ensure that the whole structure is in view.
- Once at the appropriate radius, start the mission.
- Set the speed to less than 5 mph to reduce motion blur.
- Note that the speed for the Point of Interest mission cannot be set until the mission has started.
- Capture the oblique images while Point of Interest mode flies automatically.
- Each image should overlap the previous image by at least 50%
- Each facet of the structure should be visible in at least three oblique images.
- This should result in at least 14 equally spaced oblique images.
- After the oblique images have been captured, stop the Point of Interest mission.
- Land the drone.
- Review the images.
Oblique Image 1
Oblique Image 2
Oblique Image 3
Oblique Image 4
Oblique Image 5
Oblique Image 6
Oblique Image 7
Oblique Image 8
Oblique Image 9
Oblique Image 10
Oblique Image 11
Oblique Image 12
Oblique Image 13
Oblique Image 14