• HELCOM Metadata catalogue
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Oil slicks and spills HOLAS 3

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.

Simple

Date (Creation)
2023-03-15
Unique resource identifier
https://metadata.helcom.fi/geonetwork/srv/eng/catalog.search#/metadata/b4fb29d5-182f-4a90-9bc1-4e2b0d0df681
pointOfContact
  HELCOM Secretariat

GEMET - INSPIRE themes, version 1.0

  • Oceanographic geographical features

GEMET

  • shipping accident

  • oil spill

  • environmental impact

Keywords
  • MADS

  • HOLAS3

  • Pressure layer

Use constraints
Other restrictions
Other constraints

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
Other restrictions
Other constraints
Access constraints: No limitations on public access.
Spatial representation type
Grid
Metadata language
English
Topic category
  • Environment
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Begin date
2016-01-01 Unknown
End date
2021-12-31 Now
Unique resource identifier
EPSG:3035
Distribution format
  • ESRI Shapefile ( 1.0 )

OnLine resource
Download Oil slicks and spills HOLAS 3 ( WWW:LINK-1.0-http--link )
OnLine resource
View Oil slicks and spills HOLAS 3 ( WWW:LINK-1.0-http--link )
Hierarchy level
Dataset

Conformance result

Date (Publication)
2010-12-08
Statement

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.

File identifier
b4fb29d5-182f-4a90-9bc1-4e2b0d0df681 XML
Metadata language
English
Character set
UTF8
Hierarchy level
Dataset
Date stamp
2023-04-14T14:04:37
pointOfContact
  HELCOM Secretariat
 
 

Overviews

Spatial extent

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S
E
W
thumbnail


Keywords

GEMET
environmental impact oil spill shipping accident
GEMET - INSPIRE themes, version 1.0
Oceanographic geographical features

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Associated resources

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