1. ODV format templates for nutrients, dissolved gases and contaminants in different matrixes (water, sediment, biota)
OGS – Marina Lipizer
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2. EMODnet Chemistry uses SeaDataNet infrastructure for the technical set-up.
It adopts:
SeaDataNet Standards (SDN) for data and metadata, and for product data and metadata
Common Data Index mechanism (CDI) to access data with data policy
Ocean Data View format (ODV) for data exchange
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3. Data Templates Information and examples of Data transport formats:
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4. Current information available:
Templates for dataset on:
Vertical profiles
Time series
Water
Sediment (?)
Biota (?)
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5. Data Templates
Templates of datasets for water column data (eg. Nutrients, dissolved oxygen, contaminants:
ODV_timeseries_chemical_data.txt
ODV_vertical_profiles_CTD_with_instruments.txt
BioODV_1.0d.xls
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6. Data Templates Distinction between VERTICAL PROFILES and TIME-SERIES:
Profile data have row_groups made up of measurements at different depths. The primary variable (which is indicated in column 10) is the ‘z co-ordinate’, which is either depth in metres or pressure in decibars.
Used for stations usually not repeated regularly over time, for which several depths are sampled. Typical examples:
CTD profiles, bottle stations (chemical data, chlorophyll, plankton,…)
…. ….
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7. Data Templates Time series:
Point time series have row_groups made up of measurements from a given instrument at different times. The primary variable (column 10) is time.
Used for the same station repeated regularly over time, for which usually a single depth is sampled. Typical examples:
biota composition (contaminants in biota), sediment composition, mooring data (eg. oceanographic buoy)
Example: Time series of bottle data
…. ….
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8. Guidelines for sediment data
Examples of sampling devices a d c b
a: Grab; b: box core; c: core (single); d: multicore
The «depth» variable represents a depth INSIDE the seabed.
P01: COREDIST: The distance of a sensor or sampling point below the floor of a water body
COREDIST
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9. Guidelines for sediment data
Sampling device:
core
Which depth?
MINCDIST
Minimum depth below surface of the bed
MinDepBelowBed
The minimum distance between part of a sample and the seabed such as the distance between the top of a core segment and the top of a core.
COREDIST
Depth below surface of the bed
DepBelowBed
The distance of a sensor or sampling point below the floor of a water body
MAXCDIST
Maximum depth below surface of the bed
MaxDepBelowBed
The maximum distance between part of a sample and the seabed such as the distance between the base of a core segment and the top of a core.
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10. Guidelines for sediment data
Additional depth information. Particular cases:
Core cut into sections:
MINCDIST: - The distance between the top of a core sample and the seabed.
MAXCDIST: - The distance between the base of a core sample and the seabed. For an unsegmented core with its top coincident with the bed this is equivalent to the core length (MAXCDIST*)
COREDIST: - The distance of a sensor or sampling point below the floor of a water body
SEGMLENG: - The physical length of a sample upon which measurements have been made
As a general rule:
COREDIST = MINCDIST + (MAXCDIST-MINCDIST)/2
and SEGMLENG = MAXCDIST - MINCDIST.
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11. Guidelines for sediment data
Samples from an entire, unsegmented core:
MINCDIST
MAXCDIST
SEGMLENG
Seabed
sediment
COREDIST
MINCDIST: - The distance between the top of a core sample and the seabed. * For an unsegmented core with its top coincident with the bed this is 0.
MAXCDIST: - The distance between the base of a core sample and the seabed. *For an unsegmented core with its top coincident with the bed this is equivalent to the core length
COREDIST: - The distance of a sensor or sampling point below the floor of a water body
SEGMLENG: - The physical length of a sample upon which measurements have been made
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12. Guidelines for sediment data
Depth information:
Mandatory: COREDIST
Optional (strongly recommended): MAXCIDST, MINCDIST
Optional: SEGMLENG
Vertical profiles:
Primary variable is COREDIST
Time series:
Primary variable is TIME
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13. Concentration of contaminants in the sediment:
Examples of P01
Concentration of contaminants in the sediment:
When information on size class is indicated:
When information on size class is indicated or not:
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14. Reach the correct P01 from P02: Discovery vocabulary:
Examples of P01
Reach the correct P01 from P02: Discovery vocabulary:
Scroll the list to find the correct P01 (other examples at the end)
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15. Templates for sediment data
Vertical profiles:
Time series:
Templates from Geo Seas Project and SDN
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16. Biota Templates
Guidelines for biota composition (eg. contaminants in biota) data:
Time series (mostly):
Point time series have row_groups made up of measurements at different times. The primary variable is time.
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17. Open issues:
Selection of Time – series vs Vertical Profile is sometimes tricky and subjective in case of repeated profiles over time or time-series at several depths
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18. Examples of P01
Scroll the list to find the correct P01 (other examples at the end)
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19. Examples of P01
Scroll the list to find the correct P01 (other examples at the end)
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