MAES stands for Mapping and Assessment of Ecosystems and their Services.
Action 5 of the EU Biodiversity Strategy to 2020 calls Member States to map and assess the state of ecosystems and their services in their national territory with the assistance of the European Commission.
If you want to know why is the EU doing this, go to the Mapping and Assessment of Ecosystems and their Services (MAES) page in the Biodiversity Information Service for Europe (BISE).
