190cf312-0955-4cca-9a92-6111da97d4e4 English HELCOM Secretariat data@helcom.fi 2023-04-14T14:04:00 EPSG:3035 Changes to hydrological conditions HOLAS 3 2023-03-15 https://metadata.helcom.fi/geonetwork/srv/eng/catalog.search#/metadata/190cf312-0955-4cca-9a92-6111da97d4e4 Pressure layer combines all human activities that cause changes to hydrological conditions. The human activities were presented as point data which were given spatial extents (given below). The pressure value was given as the proportion of the grid cell under the pressure. Water course modification: 1 km buffer[10]. Location of water course modifications used for buffer. Overlaps removed and areas of buffer calculated per each grid cell. The final value was the area of the buffer in each individual cell. Wind farms: 300 m buffer around each turbine classified as operational, with linear decline (Type B decline), composed of 3 rings. Location of operational turbines as points were buffered and values given over linear decline. Oil platforms: 500 m buffer around each turbine with linear decline (Type B decline) composed of 5 rings. Location of oil platforms as points were buffered and values given over linear decline. Hydropower dams: A grid cell in the estuary. Locations of hydropower dams were crossed with rivers and the grid cell located in the end of the river was selected as presence (1) – those that are operational and produces energy. Other values in the grid were considered absence. [10] Extent based on wind farms and cables but expanded to 1 km because hydrological parameters are widely spreading. The human activity datasets were first processed separately covering the whole Baltic Sea and then summed together and overlapping areas were dissolved to remove double counting. Attenuation gradients are assigned to each layer as described above. Area effected decreases when distance from avtivity increases. Layer was normalized. HELCOM Secretariat data@helcom.fi Hydrography GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme environmental impact GEMET 2018-08-16 geonetwork.thesaurus.external.theme.gemet-en MADS HOLAS3 Pressure layer 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)" Access constraints: No limitations on public access. English environment 7.5348 33.8582 52.5021 66.4302 2016-01-01 2021-12-31 ESRI Shapefile 1.0 https://maps.helcom.fi/website/MADS/download/?id=190cf312-0955-4cca-9a92-6111da97d4e4 WWW:LINK-1.0-http--link Download Changes to hydrological conditions HOLAS 3 https://maps.helcom.fi/website/mapservice/?datasetID=190cf312-0955-4cca-9a92-6111da97d4e4 WWW:LINK-1.0-http--link View Changes to hydrological conditions HOLAS 3 Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 Data source: See separate fact sheet on human activities listed in the description. Data quality: Gaps may occur. Attribute information: Raster values represent the area effected (km2). Spatial resolution: Original data as vectors, finally converted to 1 km x 1 km grid. Spatial extents and potential attenuation gradients are assigned to the specific pressure layers. They are merged (by affected area, km2) to avoid overlapping areas. Intersected with 1 km grid to calculate % of area affected within a cell. Normalized.