Mon GéoSource
Physical environment - In situ data - Chlorophyll a concentration collected during the International Bottom Trawl Survey in 2007 - Kriging error
Three environmental parameters were measured in situ during the IBTS in 2007. Temperature and salinity were measured using thermosalinometer 3 to 5 m under sea surface. Sub-surface (3-5 m) chlorophyll a concentration was measured using a fluorometer (measure the fluorescence emitted by the pigment). The IBTS survey, which takes place each year in January, gives a good illustration of winter conditions.
Simple
- Alternate title
- IBTS_environment_geostatS
- Date ( Publication )
- 2009-12-31T00:00:00
- Identifier
- CHARM_IBTS_CHLOROA_KRIG_R
- Presentation form
- Digital map
- Other citation details
- Source CHARM Consortium
- Credit
- IFREMER
- Credit
- CHARM consortium
- Status
- Completed
Point of contact
Ifremer
-
Yves Verin
(
)
Laboratoire de Ressources Halieutiques, Ifremer, 150 quai Gambetta BP699
,
Boulogne sur mer
,
62321
,
- Maintenance and update frequency
- As needed
- Thèmes Sextant ( Theme )
-
- /Physical Environment/Physical Habitats
- Keywords ( Discipline )
-
- Species data set
- CHARM
- GEMET - INSPIRE themes, version 1.0 ( Theme )
-
- Habitats et biotopes
- external.theme.gemet ( Theme )
-
- ressource halieutique
- Use limitation
- research-only
- Access constraints
- License
- Other constraints
- Has to be cited this way in maps : "Source CHARM Consortium"
- Other constraints
- Has to be cited this way in bibliography : "Carpentier A, Martin CS, Vaz S (Eds.), 2009. Channel Habitat Atlas for marine Resource Management, final report / Atlas des habitats des ressources marines de la Manche orientale, rapport final (CHARM phase II). INTERREG 3a Programme, IFREMER, Boulogne-sur-mer, France. 626 pp. & CD-rom"
- Spatial representation type
- Grid
- Denominator
- 1000
- Metadata language
- en
- Metadata language
- fr
- Character set
- UTF8
- Topic category
-
- Biota
- Oceans
- Environment
- Environment description
- Microsoft Windows XP ; ESRI ArcGIS 9.x
- Geographic identifier
- Dover strait and southern half of the North Sea
N
S
E
W
))
- Begin date
- 2007-01-01T16:09:00
- End date
- 2007-01-31T09:00:00
- Reference system identifier
- 4326
- Reference system identifier
- EPSG / WGS 84 (EPSG:4326) / 7.4
- Number of dimensions
- 2
- Dimension name
- Column
- Dimension size
- 334
- Resolution
- 0.009 degree,
- Dimension name
- Row
- Dimension size
- 314
- Resolution
- 0.009 degree,
- Cell geometry
- Area
- Transformation parameter availability
- No
Distributor
- OnLine resource
-
CHARM web site
(
WWW:LINK
)
CHARM web site
- Protocol
- COPYFILE
- Name
- Kriging error
- Description
- Kriging error
- OnLine resource
-
CHARM_IBTS_CHLOROA_KRIG_R
(
OGC:WMS
)
Kriging error
- Hierarchy level
- Dataset
- Statement
- The survey concerns the Dover Strait to the southern half of the North Sea. Its aim is to estimate fish abundance and distribution and to compute recruitment indices (abundance of juveniles) for the fish species exploited in the North Sea. In parallel to its regular actions, the 2007 French IBTS used a continuous fish egg pumping device called CUFES allowing the collection of information on the spatial distribution of winter spawning areas and on the spawning habitat of several important species.
- Description
- Kriging produces an estimation of the interpolation error (measured as an estimation variance), whereas classical interpolation methods, based on arbitrary mathematical functions, cannot estimate it. Moreover, this error is reduced as much as possible as the kriging predictor minimises it by definition. Indeed, for each estimation, the weights given to neighbouring observations are computed from the variogram model and are derived so as to minimise the estimation variance. As a result, for mapping purposes, kriged interpolation produces a large field of estimates at points or blocks and corresponding kriging error.The kriging error grids of points resulting from the interpolation of environmental parameters were imported into ArcMap and interpolated with the Spatial Analyst extension in order to create a continuous raster of 1 km² resolution. The resulting maps illustrate the interpolation error of each parameter.
- Description
- IBTS survey, scientific survey of IFREMER
- File identifier
- d901600a-5034-467f-a78d-8546c6913dd7 XML
- Metadata language
- en
- Character set
- UTF8
- Hierarchy level
- Dataset
- Date stamp
- 2020-06-04T01:01:00
- Metadata standard name
- ISO 19115:2003/19139 - SEXTANT
- Metadata standard version
- 1.0
Overviews
Spatial extent
N
S
E
W
Provided by
Associated resources
Not available