GPS dependence has been the Achilles' heel of drone-based surveying for years. In environments such as tunnels, underground mines, or dense forests, the satellite signal degrades or disappears, compromising flight safety and accuracy. The Skydio 2+ from Skydio breaks this technological barrier by implementing a navigation system based exclusively on 360° vision and neural networks, offering a robust alternative for surveys in GNSS-denied conditions.
Inertial-visual navigation architecture and neural SLAM 🚁
The Skydio 2+ integrates a set of six navigation cameras that capture the environment in a full radius, feeding a convolutional neural network model trained to recognize obstacles, edges, and textures in real-time. This system runs a visual SLAM algorithm that builds a three-dimensional map of the terrain without needing external references. For the surveyor, this translates into the ability to perform inspection flights in mine galleries or under vegetation canopies, maintaining sub-meter relative positioning accuracy. Unlike conventional drones that require RTK base stations, this approach allows survey continuity even in areas of total satellite shadow, synchronizing data with the high-resolution camera positioning to generate georeferenced point clouds through subsequent control points.
Implications for geomatics in critical infrastructure 🏗️
The ability to operate without GPS not only expands the range of applications but also redefines workflows in infrastructure inspection. On bridges or railway tunnels, where the metal structure blocks the signal, the Skydio 2+ flies autonomously following the asset's geometry, capturing photogrammetric data with a point density that competes with terrestrial laser scanners. For the construction sector, this means being able to inspect interior slabs or basements during the construction phase without needing to install beacons or external guidance systems, reducing layout time and increasing safety by eliminating the need for operators in hazardous areas.
Considering the limitations of GPS in underground environments, such as tunnels or mines, what specific advantages and limitations does the Skydio 2+'s 360-degree vision navigation system offer compared to traditional topographic layout methods in these spaces without satellite signal?
(PS: 3D surveying is like making a treasure map, but the treasure is an accurate model.)