ca327bb1-d3cb-46c2-8316-f5f62f889090 English HELCOM Secretariat data@helcom.fi 2023-11-10T14:27:46 EPSG:3035 Zostera marina distribution (HOLAS 2) 2018-01-15 https://metadata.helcom.fi/geonetwork/srv/eng/catalog.search#/metadata/ca327bb1-d3cb-46c2-8316-f5f62f889090 Distribution of eelgrass based on data submission by HELCOM contracting parties. Mainly pointwise occurrences of eelgrass were submitted, originally gathered in national mapping and monitoring campaigns, or for scientific research. Polygon data from Puck Bay (Poland) was digitized based on Polish Marine Atlas and Orlowo cliff area was added based on expert knowledge. From Estonian waters, a predictive model was used (200m resolution), that was converted to presence/absence using minimized difference threshold (MDT) criteria. All data (points, polygon and the raster presenting predicted presence of eelgrass in the Estonian waters) were generalized to 5km x 5km grid cells. HELCOM Secretariat data@helcom.fi Habitats and biotopes Species distribution GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme marine ecology GEMET 2018-08-16 geonetwork.thesaurus.external.theme.gemet-en MADS HOLAS2 ecosystem component Biodiversity Use constraints: Data can be used freely given that the source is cited as "HELCOM HOLAS II Dataset: Zostera marina distribution (2018)". Access constraints: No limitations on public access. English environment biota 7.530495 34.131647 52.277123 66.475422 1995-01-01 2016-12-31 TIFF https://maps.helcom.fi/website/MADS/download/?id=ca327bb1-d3cb-46c2-8316-f5f62f889090 WWW:LINK-1.0-http--link Download dataset 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: Denmark: Point data from national monitoring along transects (dive and video), data from 2007-2015. Data is available through Miljøportalen Estonia: Finland: Point data gathered during the national marine mapping programme VELMU (2004-2015) and inventories from Åland Islands. Germany: Point data originally collated for monitoring and research purposes (video, photos, dive, wading, snorkeling), data from 2010-2015. Latvia: No reported occurrences of eelgrass. Lithuania: No reported occurrences of eelgrass. Poland: Polygon data digitized based on Polish Marine Atlas http://www.iopan.gda.pl/hm/atlas/Atlas_all.pdf . Expert consultation. Russia: Data used in the previous HELCOM RED LIST assessment have been used for Russian marine areas. Sweden: Point data from national monitoring and mapping surveys (1995 -2015) extracted from SMHI SHARK database. 2018 updates: Updated data from Sweden and Finland and new data from Russia were included. Data quality: Mapping is not exhaustive and sampling density varies between the countries. Attribute information: Raster value representing presence (1) or absence (0) of <i>Zostera marina</i>. Spatial resolution: 1 km x 1 km grid (originally 5 x 5 km).