Terrestrial and Aerial photogrammetry is the art, science and technology for obtaining reliable information and measurements from photographs.
To create these maps or 3D models a high detail camera is mounted on a drone. Multiple overlapping photographs of the ground are taken as the drone flies along an autonomous programmed flight path limited by the boundary waypoints.
Each construction site has a unique set of conditions that will determine which survey technique should be used. When using a drone for photogrammetry surveys it could have the following benefits:
At CD Surveys Ltd, we can offer many different services for our DJI Phantom 4 drone, all of these services are aimed at giving our clients the best product possible at a very affordable price.
Topographical / Construction sites
Our drone can cover large areas in a short space of time, providing a verification or an overlay onto the topographical survey. The drone can also be used to provide detailed videos or photographs of the site that can be used to collate a visual record of the sites progress, which could be carried out periodically.
The use of the drone is low-impact and non-intrusive so all work on site can continue.
Building / Structures
The major benefits of using a drone for building surveys is the ability to see detail that may otherwise be hidden from the conventional methods. Theodolites and laser scanners have one major drawback and that is that they are only able to work where the operator is able to work and what is clearly visible. With the use of the drone we can now reach levels of the building which cannot be been seen with the scanner. Roof detail or high levels on a multi-story building can now be captured in high detail giving us the option to import the photographs to our pointcloud data or to use the photographs to draw in the missing elements.
It should be noted that the CAA has strict rules on where and when a drone can be used and although we can cover most hurdles privacy and access issue would normally be undertaken by the client.
We are also a member of the Institute of Directors