Terra Drone Europe uses drones (small unmanned helicopters and planes) for aerial surveys and mapping. This is achieved by combining low altitude aerial photography with geometrically calibrated cameras and a technique called photogrammetry. With these pictures we create 3D digital elevation and terrain models as well as orthophoto mosaics.
The use of a drone for aerial survey and mapping has several distinct advantages over the use of conventional aerial photography and/or GPS measurements in the field:
With the use of photogrammetry, we are able to obtain all the heights of a terrain or object. For each height (Z) we can also extract the location co-ordinates (X, Y). In this way, a digital terrain model can quickly be created that enables in reference re to a ground plane, or if two 3D terrain models are taken from the same location at different time intervals the differences can calculated. The quality of these 3D digital terrain models is very high. Recent projects showed a maximum deviation of only 20 mm. The measured density (point density) can reach more than 1000 points per square meter! In collaboration with our sister company Deep BV from Amsterdam we are also able to create digital terrain models that extend below the water. Check the Guatemala breakwater survey as an example of our collaboration.
The individual images can be adjusted for the elevations in the terrain corrected for colour differences due to changing weather conditions. All the pictures can then be joined into a seamless orthophoto mosaic. As the image is fully to scale it can then be imported directly in a CAD or GIS as a backdrop and used for measuring or mapping. Take a look at our projectpage for some examples.
Seven cable landings in Northern Ireland and Scotland
Aerial Survey using a Fixed Wing Drone in the UK
Aerial Survey of a 65 km proposed route in the Emirates
We create stunning 3D Mesh models from buildings, offshore platform up to entire city blocks
We create digital terrain models from photography with drones for volume calculations.
Terra Drone produces orthophoto mosaics corrected for terrain heights and color differences.
Fast, safe and accurate volume measurements using a drone
New geo-data collection method using Laser under a drone