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Creation and evaluation of a 3D terrain model from drone data by means of PointCab

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Creation and evaluation of a 3D terrain model from drone data by means of PointCab

In this user report, we clearly explain the work steps from flight planning with the UAV (drone), work on site, subsequent calculation of the point cloud, and the evaluation of the terrain data in the PointCab software. The aim of the project was to survey a quarry by means of a drone and to carry out the required evaluations with regard to mining technology. This mainly concerned the pit pattern, the pit geometry, and volume calculations.

Planning phase (flight preparation)

In preparation for the aerial inspection by the UAV (drone), passing points were sprayed on the ground with signal paint. The passing points were then localized with a GPS receiver and the positions saved.

To ensure a safe and smooth flight, the terrain was inspected and its topological conditions examined in consultation with those working on the terrain. These data were used to create a flight plan. In this flight plan, metadata of the camera and the desired flight altitude were entered in the software to obtain the greatest possible accuracy later. The flight plan was then transferred onto the UAV.

Flight phase

The UAV flew across the coordinates autonomously and triggered the camera at the right point in time to create the necessary images. A pilot was not necessary; he merely monitored the process and checked the smooth sequence of the flight. As soon as the UAV had concluded its flight, the pilot landed the drone. Subsequently, a new flight plan was created, taking its starting point from the previous plan.

Creation of the point cloud in the Agisoft Photoplan program

In the first step, the images were aligned in relation to one another, thus creating a rough point cloud. The GPS points measured in the preparations were linked to the colored passing points on the ground. The roughly calculated point cloud was then aligned exactly to the GPS passing points, creating a high-resolution point cloud with exact coordinates in the national grid. In order to be able to work better with the data as the project progressed, the surface was meshed – i.e. a calculation was used to place a “mesh grid” over the point cloud. Thereafter, there is the possibility to output the point cloud in various file formats.

Evaluation of the data in PointCab

The data were imported into PointCab and processed. PointCab used the point cloud data of the drone in the common *.las format. In this project, we referenced the point cloud from Agisoft onto the passing points once again. In our experience, this enhances the accuracy. Next, PointCab was used to generate a surface model. We used this model later in Autodesk. In addition, it was a simple task to use PointCab to obtain distances, lines, surfaces, sections, volumes, 3D elevation points, and other information. The great advantage of PointCab is that the software is very easy to operate and can be used by a great many users without extensive prior knowledge.

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