Data Capture Guide¶
Each type of dataset in Smart Data has a specific method of capture that works best. This section will go through each of the different types of datasets and explain the best ways of capturing that data. There’s also a handy instruction card for each one that you can print out and take with you in the field.
Currently, Inspection Viewer is optimised for vertical tower structures. It is not suitable for any other type of structure such as building facades, roof inspections, horizontal pipes, etc.
For best results, follow these steps:¶
Position your drone at the base of the object, making sure the camera is pointing at its centre.
Take off and hover close to the ground, then adjust the pitch of your camera to have a slight downward angle of no more than 15°.
Adjust the distance away from the object until the camera captures most of its width.
Adjust camera yaw so that the object is centred in the image.
While minimising horizontal movement, follow the object vertically and take a photo every few metres of altitude change. Select the capture interval so that images overlap somewhat (around 10% to 20%).
While keeping the distance to the object unchanged, repeat step 5 around the object until you have captured a set of parallel vertical image sets encircling the object (see figure below). The parallel image sets also should overlap slightly (approximately 10% to 20%).
To facilitate image acquisition, we recommend using the DJI GS Pro app in 3D Map POI mode (vertical mode). Note that the Inspection Viewer can only handle JPEG images. Do not submit any other file formats (e.g. RAW files, etc.) for processing.
All photos should have a consistent pitch that is set at the start of your flight. This will help create a smooth transition between each image when a user is navigating the dataset. If the pitch changes between images, the user may have an unpleasant experience.
Centre the objet in frame¶
Ensure the object is centred in the images. Avoid adjusting the yaw or horizontal position during a vertical run so that the images from each vertical path have the same perspective.
Consistent capture distance¶
Keep the capture distance to the object consistent along each vertical path. Some towers have guy-wires that mean you might not be able to get very much, if any, horizontal overlap. We recommend capturing with a little bit of overlap, but there is no minimum requirement.
Consistent capture altitude¶
The images in each vertical run should be spaced equally and taken at the same altitude. This creates a smooth transition for the user when they move sideways.
Straight lines along the tower¶
Vertical flight paths should be as straight as possible. When you have finished a vertical run, move across to the next one.