The Preliminary Survey

A classic task for surveyors is establishing the situation as-is. In some sectors, this task has been revolutionised by the aid of UAVs and laser scanners or digital cameras. The bird’s eye view permits the quick, precise and complete capture of all visible elements of the measured area, with correct heights and orientation. Resurveying for forgotten or later assigned elements becomes redundant, as a 3D likeness of reality has already been created.

In many of the following examples we will constantly arrive at the conclusion: Why send a human into danger when a UAV flyover can cover all bases?

Capturing the Terrain

With a UAV, it is no longer necessary to walk off and measure 1000s of points. A few control points and a few hours of flight are enough to cover up to 100 hectares in free, open terrain with an accuracy in the range of a GNSS survey. Smaller areas of up to 20 hectares can even be evaluated within one hour and a classified point cloud, accurate to centimetres in position and height, can be delivered.

Thanks to high-quality inertial systems and the subsequent optimisation of the trajectory with the aid of RiPrecision, surveying is also possible without control points in case of doubt. Only a slight deterioration in precision is to be expected.  

Overall, we have focused our efforts on flights over areas whose photographic and aeronautical demands are simply too high for toy drones, yet for which hiring a helicopter would be too costly.

We are specialists in flight planning over steep terrain and have a great deal of experience in mountain ranges. We have also taken on significant challenges in flight planning and operation, such as the creation of orthophotos with a geometric resolution of one millimetre per pixel.

Heavy Vegetation

The use of active sensors allows us to generate accurate and rigorous point clouds, (almost) regardless of vegetation, season and lighting conditions.

River Basin Surveys

More often than not, overgrown riverbanks represent a real nightmare for surveyors. Alongside factors like incline and plant cover, accessibility is often an issue. Our system, featuring a copter and laser scanner, can help survey such areas quickly, precisely and without the need to start uprooting the local flora! These surveys can then form the basis of other plans or hydraulic models.

Measuring Volumes

For smaller areas, it is often time that factors into choosing a UAV flyover. For larger areas, this challenge is joined by a need for true-to-life detail from the flight. Measuring the volume of a reference area is possible with the insertion of special programmes within the point cloud.

Uses in the field include quarries, woodchip piles from district heating plants, describing the contents of empty dammed lakes, and gauging the level of sediment in the equalizing basin of hydroelectric plants.