The main objective of the project was to study the need and content for a GIS-database and application which would assemble essential national databases of biomass. From the very beginning, it was recognized that databases should be accessible via the Internet and by map-based user interface. The tool was named Biomass Atlas. The main result of this report is the plan to realize Biomass Atlas: how the web-based user interface utilizing refined biomass data should be put into practice. Users of biomass data were interviewed in personal meetings as well as via an Internet survey during the project. Users were recognized widely from the administrative to the operational level. There is an explicit need for biomass data of every biomass type. The acquisition of data is considered to be demanding. Two-thirds of respondents viewed the Biomass Atlas-like application as important, and almost all viewed it as at least useful. The most important demands for the data were reliability and up-to-date status. The most important biomass databases or methods to develop them with regard to biomass from agriculture, forestry and watersheds as well as peat were examined, as well as other related projects enhancing GIS data distribution. There are nationwide databases ready for forest biomass, waste and manure. Peat from wetlands is mapped widely in Southern Finland. Fields and crops are registered annually, which makes it possible to count the yearly biomass data. Data acquisition of biomass from watersheds such as common reed and fish is going to proceed in the years to come, and we can therefore expect to obtain GIS data from them. It is possible to open most of the biomass data covered in this study. Pointing out precise location information in high resolution is restricted by the Finnish personal data act. In addition to biomass data, data and tools helping to evaluate impacts of biomass harvest and use were mapped within the project. The plan was made to develop the database and user interface. The plan consists of technical definitions and suggestions towards a cooperative model which can be used for system development. The system is possible to implement in either an open or closed manner, i.e. using a commercial source code. The choice of technology can be defined during the procurement-based negotiations with software companies. Maintenance of the Biomass Atlas system requires regular updates of the data and system versions and ensuring information security. Continuous external funding and sufficient know-how are needed to secure these requirements. It is possible that Biomass Atlas shall become the most significant single tool for implementing the Finnish bioeconomy strategy. In order to enhance the strategy in the best possible way, Biomass Atlas should also take into account impacts to the environment, economy and social sustainability caused by the utilization of various biomass types