Up to a third of Finland's river water bodies are in moderate, poor or bad ecological status, and only a few pristine streams occur outside the northernmost province of Lapland. However, several streams and rivers have been modified also in Lapland to enhance flood protection, land drainage, timber transport, and for hydro-electric power generation. These hydromorphological alterations reduce stream habitat and water quality and have caused extinctions and drastic population declines in several migratory fish stocks. There is an urgent need for efficient methods for characterisation and mapping of stream habitats and riverbeds as the national effort and investments on stream restoration projects are likely to increase in the near future. In the mining industry, it is necessary to a some extent modify streams and rivers also for future operations. In this case, it is necessary to carefully investigate the current situation before, during and after the modification, so that the rivers remain as natural as possible. It has been particularly problematic to map the shape of the riverbeds and the underwater bottom data, which is very labor-intensive and slow. The bottom profile of the riverbeds affect, among other things, the flow and thereby, for example, the mixing of industrial discharge waters in the receiving water body. In addition, they are important when planning the restoration of the riverbed, e.g. as spawning grounds and juvenile habitats for migratory fish. The bottom structures of mine ponds consist of several different layers (e.g. crushing, protective and drying layers) and an HDPE membrane on top. The most recent environmental accidents of mining operations derive from problems related to the membrane and bottom structures. With current measurement methods, the functionality and condition of these structures cannot be examined reliably enough during operation, and leaks and collapses are often noticed with a delay. Reliable, cost-effective methods are needed to prevent possible problems in the bottom structures. The Uomari project develops and pilots drone-based measurement and imaging solutions related to reducing the environmental harm and risks of industrial operations, e.g. for the needs of the mining industry. In addition, we are testing drone-based measurements for stream habitat characterisation and habitat modelling to enhance stream restoration planning and restoration assessment. Moreover, we are piloting the utilization of several imaging methods for studying the condition of pond and tailings facility structures in different seasons. Finally, test data obtained with drone measurement systems and traditional measurement methods are compared, and their usability in different types of cases is investigated. As a result of the project, new cost-effective methods will be created for the mapping of riverbeds and for the control and monitoring of mine pond and dam structures. With the help of new methods, the management of environmental risks is increased both in terms of mine ponds and receiving water bodies. At the same time, new business opportunities are created for mapping and monitoring operators. Although the research in the project is particularly focused on mining areas and their surrounding streams, the goal of the project is to develop research methods that can be easily applied in other types of environments as well. Based on the experiences gained in the project, the methods can be further refined for other applications. Similar river bottom mappings could be used e.g. in the permitting of watercourse construction projects, in the suitability studies of dumping sites and in the validation of flow modelling. Different sounding measurements could also be used in the planning of dredging works and in structural surveys of power plant and bridge construction sites. In addition to mining ponds, drone-based methods could also be used for underground object detection (UXO), lake sediment research (water pollution) and landfill research (seepage water). The project's activities focus on the regions of Lapland and Kainuu, but the project partners' activities cover the whole of Finland. In addition, the various networks in which the project partners are involved (e.g. Vesistökunnostusverkosto, Kuopio Water Cluster (KWC), Freshwater Competence Center (FCWW)) create a strong basis for the development work of new technologies, their piloting and putting them into practice after the end of the project.