Image Capture
Image capture is a fundamental step in creating accurate and detailed 3D models. It is essential for obtaining high-quality results.
A bad image capture may result in processing failure, incomplete reconstructions or distorted outputs.
Camera Selection
Ideally, choose a high-resolution camera with minimal lens distortion and a mechanical rolling shutter. Other cameras will work too, but might not produce best results.
Capture Plan
A high overlap between images is required, typically between 70-85%. Planning software exist that can design and execute flight plans for mapping purposes. I recommend to use Dronelink, but other options are also available. Manual capture of images is not recommended.
Below are recommendations for various scenarios that can apply to most software planning software.
General
Regular grid pattern, at least 75% overlap and 60% sidelap, fixed altitude.
Forest
Regular grid pattern, at least 85% overlap and 85% sidelap. Increase flight height. If possible, set the target GSD to 10 cm / pixel or higher.
Agriculture
Regular grid pattern, at least 80% overlap and 60% sidelap. Increase flight height.
Building
Orient the camera toward the target object so that it fills most of the image frame. Make multiple passes around the building while flying at progressively higher altitudes and adjusting the camera angle to keep the target in the frame.
Water
Oceans cannot be reconstructed, but shorelines, rivers and lakes can, as long as some land features are visible in each image.
Snow
At least 85% overlap, 75% sidelap. Adjust camera settings to increase contrast.
Corridors
At least two flight lines, 85% overlap and 60% sidelap.
City
Double grid pattern, at least 75% overlap and 60% sidelap, camera angle between 10° and 30°.
Tower
Fly close to the structure in circles at progressively higher elevation 90% overlap between images of the same height and at least 60% overlap between different elevations.
Thermal
At least 90% overlap and sidelap, image resolution of 640x480 pixels or higher.