b4fb29d5-182f-4a90-9bc1-4e2b0d0df681 English HELCOM Secretariat data@helcom.fi 2023-04-14T14:04:37 EPSG:3035 Oil slicks and spills HOLAS 3 2023-03-15 https://metadata.helcom.fi/geonetwork/srv/eng/catalog.search#/metadata/b4fb29d5-182f-4a90-9bc1-4e2b0d0df681 The pressure oil slicks and spills is combination of following datasets: Illegal oil discharges (2016-2021): Value of spills (VOLUME) under OR EQUAL 1km2 was directly given to grid cell. If the spill area > 1km2, a buffer with the area was added (circular buffer based on estimated radius) and the estimated volume of the spill was divided by the spill area to get the estimated amount of oil / km2. This value was given to the entire spill area. If oil spill volume was missing, mean of values was given. If area of spill was missing (103/560), mean of values was given. If the spill was < or = 1km2, the value of spill volume was given directly to 1km2 grid cell. If the spill area was > 1km2, the estimated volume of the spill was divided by the spill area to get the estimated amount of oil / km2. This value was given to the entire spill area. Layer was log transformed and normalized. Polluting ship accidents (2016-2020): Point, spill volume (m3) converted directly to 1 x 1 km grid A mean of reported volumes was given to accidents with missing oil volume. Spill volume in m3 was given directly to 1km2 grid cell. Layer was log transformed and normalized. Layers were separately normalised. After that, layers were summed and again normalised to produce the final pressure value between 0 and 1. HELCOM Secretariat data@helcom.fi Oceanographic geographical features GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme shipping accident oil spill 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=b4fb29d5-182f-4a90-9bc1-4e2b0d0df681 WWW:LINK-1.0-http--link Download Oil slicks and spills HOLAS 3 https://maps.helcom.fi/website/mapservice/?datasetID=b4fb29d5-182f-4a90-9bc1-4e2b0d0df681 WWW:LINK-1.0-http--link View Oil slicks and spills 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: Illegal oil discharges data is based on airborne surveillance with remote sensing equipment by HELCOM Contracting parties in the Baltic Sea Area. Polluting ship accident data is based on data collected annually from HELCOM Contracting Parties. Illegal oil discharges: If oil spill volume was missing, median of the rest was given. If area of spill was missing, mean of the existing was given. If the spill was < 1km2, the value of spill volume was given directly to 1km2 grid cell. If the spill area > 1km2, the estimated volume of the spill was divided by the spill area to get the estimated amount of oil / km2. This value was given to the entire spill area. Polluting ship accidents: 9/24 accidents with oil spills were missing spilled oil volume, thus a mean of reported volumes was given to accidents with missing oil volume. Spill volume was given directly to 1km2 grid cell. Layers were separately normalised (0-1). After that layers were summed and again normalised to produce the final pressure value between 0 and 1. Attribute information: Index value representing pressure from oil spills and slicks, including layers illegal oil discharges and polluting ship accidents. Spatial coverage: Entire Baltic Sea. Spatial resolution: Original data reported as points, finally converted to 1 km x 1 km grid.