HELCOM Metadata catalogue
Charophyte distribution
Distribution of Charophytes (Chara spp., Nitella spp., Nitellopsis spp., Tolypella spp.) mainly based on data submission by HELCOM contracting parties. Submitted point data was originally gathered in national mapping and monitoring campaigns, or for scientific research. Also scientific publications were used to complement the data (in Curonian, Vistula and Szczechin lagoons, see reference list). Polygon data from Poland was digitized based on Polish Marine Atlas. 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 Charophytes) were generalized to 5km x 5km grid cells.
Simple
- Date (Publication)
- 2018-01-15
- Unique resource identifier
- https://metadata.helcom.fi/geonetwork/srv/eng/catalog.search#/metadata/822ddece-d96a-4036-9ad8-c4b599776eca
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GEMET - INSPIRE themes, version 1.0
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Species distribution
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Habitats and biotopes
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GEMET
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environment
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- Keywords
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MADS
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HOLAS2
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ecosystem component
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- Use constraints
- Other restrictions
- Other constraints
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Use constraints: Data can be used freely given that the source is cited followingly: HELCOM HOLAS II Dataset: Charophyte distribution (2018)
- Access constraints
- Other restrictions
- Other constraints
- Access constraints: No limitations on public access.
- Spatial representation type
- Grid
- Metadata language
- English
- Topic category
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- Environment
- Biota
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- Begin date
- 2004-01-01
- End date
- 2016-12-31
- Unique resource identifier
- EPSG:3035
- Distribution format
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TIFF
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TIFF
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- OnLine resource
- Download dataset ( WWW:LINK-1.0-http--link )
- OnLine resource
- Open in Map Viewer ( WWW:LINK-1.0-http--link )
- Hierarchy level
- Dataset
Conformance result
- Date (Publication)
- 2010-12-08
- Statement
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Data source:
Denmark: Point data from national monitoring along transects (dive and video), data from 2005-2015. Data is available through Miljøportalen
Estonia: Modelled distribution of Charophytes based on observations from national monitoring (dive and drop video) during 2005-2014
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 Charophytes
Lithuania: No reported occurrences of Charophytes.
Poland: Polygon data digitized based on Polish Marine Atlas http://www.iopan.gda.pl/hm/atlas/Atlas_all.pdf .
Russia: No reported occurrences of Charophytes.
Sweden: Point data from national monitoring and mapping surveys (1995 -2015) extracted from SMHI SHARK database.
References:
Brzeska, P. Wozniczka, A., Pelechaty, M., Blindow, I. 2015. New records of Chara connivens P. Salzmann ex A. Braun 1835 – an extremely rare and protected species in Polish brackish waters. Acta Societatis Botanicorum Poloniae. 84(1):143–146.
Sinkevièienë, Z. 2004. Charophyta of the Curonian lagoon. Botanica Lithuanica 10(1):33-57.
2018 updates: Updated data from Sweden and Finland were included. The grid of the raster was changed to match with other benthic habitat layers used in HOLAS II.
Data quality:
Mapping is not exhaustive and sampling density varies between the countries.
Raster value representing presence (1) or absence (0)
Spatial resolution: 1 km x 1 km grid (originally 5 x 5 km).
- File identifier
- 822ddece-d96a-4036-9ad8-c4b599776eca XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Date stamp
- 2023-11-10T14:23:24
Overviews
Spatial extent
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