Use constraints: Data can be used freely given that the source is cited (following creative commons license CC-BY). The source should be cited as: “HELCOM HOLAS 3 Dataset (2023).

All data reported for HOLAS3 (points, polygon and the raster presenting predicted presence of eelgrass in the Estonian waters) were generalized to 5km x 5km grid cells. Data were reported by Denmark, Germany, Estonia and Finland.

Same methodology was used for HELCOM biodiversity database data, and years 2000-2021 were selected.

For HOLAS2 datasets detailed descriptions can be found in HELCOM Metadata Catalogue.

For depth the Emodnet bathymetry 2020 data with resolution 100x100m was used. The original data was transformed to 1x1km grid so that if one 100x100m cell within the 1x1km grid was shallower than 10m, the whole grid cell was indicated as shallower than 10m.

Raster datasets were made of all 3 different data sources and summed together. Finally the datasets were filtered with the 10m depth layer.