UAV photogrammetric technology
With our UAVs, we can effectively measure large and/or hard-to-reach areas without contact and with high accuracy in three dimensions. From in-flight photographs (photogrammetry) and/or laser scan data, we process a 3D point cloud, from which we obtain highly accurate data sets such as geo-referenced orthophotos, digital terrain models. Using GIS, CAD or BIM software, we can efficiently create colour topographic maps, site plans.
Acquisition of geospatial data using uav photogrammetry or UAV laser scanning
Photogrammetry is an established method for obtaining three-dimensional measurement information from photographs in the air. We process a 3D cloud of textured (coloured) points from images for measurement and evaluation. The sample points recorded by a LiDAR provide a very similar result, because after processing they also result in a dense and mostly colourless point cloud, which allows for accurate measurements, assessments, documentation, realistic views and panoramas.
We deliver the following results based on point clouds in the predetermined output format:
- Point clouds as a result of 3D measurements / 3D documentation
- Orthophotos from different angles, e.g. of facades, towers or bridges
- Geo-referenced orthophotos of the earth’s surface in different scales and resolutions
- Digital field models
- 3D modelling and 2D drawings
- Volume determination
- Measuring project progress
Cloud of dots
The point cloud allows surface structures and complex objects to be represented using a large number of individual points in a three-dimensional coordinate system, which is usually defined by x, y, z coordinates. The scan points recorded by our UAVs using photogrammetry or a LiDAR scanner result in a dense point cloud after processing. Additional results, such as orthophotos, 2D maps, 3D terrain models relative to the survey, can be derived from the point cloud.
Undistorted images of the earth’s surface or areas such as facades or bridges are called orthophotos or orthophotos. Any distortions that occurred during the creation of the image material are calculated. This allows a correct representation of the surface or surfaces of the earth.
Orthophotos are undistorted, full-scale images of the earth’s surface. Georeferenced orthophotos have a spatial reference through a coordinate system. The possible uses of georeferenced orthophotos are very diverse and range from topography, cartography, use in GIS (geographic information systems) software to use in landscape and urban planning to visualisation. Orthophotos are created in different scales and resolutions, depending on the application.
Volume determination / digital terrain model
With our drones, we are able to capture large areas such as piles, landfills, quarries and construction sites efficiently, non-contact and with high accuracy in three dimensions so we can measure them. From in-flight images (photogrammetry) or laser scan data, a 3D point cloud is generated, based on which we perform an accurate volume determination. We can document the change in volume (difference comparison) by means of two flights at a time interval. Target/actual comparisons based on digital terrain models from different periods are also possible. In addition, we also generate an orthophoto plan when determining volume and taking measurements, which is necessary for orientation or to define materials and/or storage locations.
Digital terrain model
With our drones, we are able to capture large areas such as piles, landfills, quarries and construction sites efficiently, non-contact and with high accuracy in three dimensions so we can measure them. From in-flight images (photogrammetry) or laser scanning data, a 3D point cloud is generated, based on which we perform an accurate determination of the volume and mass of the real state. We can document the change in mass (difference comparison) by means of two flights at a time interval. Target/actual comparisons based on digital terrain models from different periods are also possible. In addition, we also generate an orthophoto plan when determining volume and taking measurements, which is necessary for orientation or to define materials and/or storage locations.
Gsd (ground sampling distance) – ground pixel resolution
The measurement, also known as ground sampling distance or ground pixel resolution, provides information about how an image element (pixel) is presented on the ground (the earth’s surface). Assuming a GSD of 1 cm, e.g. one pixel in the image, e.g. in an orthophoto, represents 1 centimetre of area. GSDs can be used to determine the resolution, level of detail and thus the quality of aerial photography. The smaller the GSD, the more detailed and accurate the representation – which increases the amount of data.
Using uav data in geographic information systems
Geographic Information Systems (GIS) are information systems that are used to record, manage and process spatial data. Correct data in the optimal size and resolution are crucial for the economical use of geodata in GIS software or GIS systems. In addition to hardware and software, GIS applications primarily require a wide variety of data that are subject to high quality requirements, which we generate and deliver using our UAVs. In the case of GIS datasets, it is of crucial importance that all data formats and quality requirements are discussed in advance in order to be able to work with them in an economical and goal-oriented manner.