PRODUCT USER MANUAL
for Level 3 SST products over European Seas :
SST-EUR_L3S_NRT_OBSERVATIONS_010_009_a
and
SST-EUR_L3C_NRT_OBSERVATIONS_010_009_b
Issue: 1.4
Contributors: Françoise ORAIN, Météo-France
CMEMS version scope : V2
Approval Date : 8 March 2016
Ref: CMEMS-OSI-PUM-010-009
Product User Manual for Level 3 SST products
over European Seas
Date
: 8 March 2016
Issue
:1.4
CHANGE RECORD
Issue
Date
DRAFT 23 May
2011
§
Description of Change
Author
All
First draft version, provided
Hervé Roquet and
for the preparation of the POR Françoise Orain
for MyOcean V1
All
Updated version, prepared for Françoise Orain
the release of MyOcean-2 V3
products
Validated By
1.0
20
February
2013
1.1
21
All
November
2013
Updated versions,
1.2
May 1
2015
All
Change format to fit CMEMS
graphical rules
1.3
Nov 2015
All
Change name web server and
reference to Myocean for
CMEMS one. Remove
references to Reunion
datasets.
Françoise Orain
B. Hackett
1.4
08 Mar
2016
All
New instruments (METOP-B,
VIIRS, AMSR2)
Françoise Orain
B. Hackett
Françoise Orain
L. Crosnier
Add VIIRS_NPP, pure netcdf4
format, change title in global
attributes
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L. Crosnier
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GLOSSARY AND ABBREVIATIONS
CHL
Chlorophyll
CF
Climate Forecast (convention for NetCDF)
DU
Dissemination Unit
MFC
Monitoring and Forecasting Centre
Med
Mediterranean
NetCDF
Network Common Data Form
SSS
Sea surface salinity.
SSC
Sea surface currents
SSH
Sea surface height
SST
Sea surface temperature
RMS
Root mean square
SDN
SeaDataNet (climatology)
SLA
Sea Level Anomalies
PC
Production Center
PU
Production Unit
Meridional Velocity
West to East component of the horizontal velocity vector
Zonal Velocity
South to North component of the horizontal velocity vector
ftp
Protocol to download files
OpenDAP
Open-Source Project for a Network Data Access Protocol. Protocol to
download subset of data from a n-dimensional gridded dataset (ie: 4
dimensions: lon-lat,depth,time)
Subsetter
CMEMS service tool to download a NetCDF file of a selected geographical
box using values of longitude an latitude, and time range
L2(P)
Level 2 Product: Retrieved (derived) geophysical variables
locations, e.g. SST satellite sensor observation.
L3(P)
Level 3 Product: Composite of L2P for a period of time, mapped on uniform
spacetime grid scales, usually with some completeness and consistency (e.
g., missing points interpolated, complete regions mosaicked together from
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multiple orbits, etc.). (Ref: Wikipedia – Remote Sensing)
L3C
Collated
L3S
Supercollated
L4ARC
The Level 4 Arctic SST analysis described in this document
L4(P)
Level 4 Product: Model output or results from analyses of lower level data
(i. e., variables that were not measured by the instruments but instead are
derived from these measurements. Ref: Wikipedia – Remote Sensing). E.g.
forecasts and the L4ARC product described in this document.
CHL
Chlorophyll
CF
Climate Forecast (convention for NetCDF)
DU
Dissemination Unit
MFC
Monitoring and Forecasting Centre
Med
Mediterranean
NetCDF
Network Common Data Form
SSS
Sea surface salinity.
SSC
Sea surface currents
SSH
Sea surface height
SST
Sea surface temperature
RMS
Root mean square
SDN
SeaDataNet (climatology)
SLA
Sea Level Anomalies
PC
Production Center
PU
Production Unit
Meridional Velocity
West to East component of the horizontal velocity vector
Zonal Velocity
South to North component of the horizontal velocity vector
ftp
Protocol to download files
OpenDAP
Open-Source Project for a Network Data Access Protocol. Protocol to
download subset of data from a n-dimensional gridded dataset (ie: 4
dimensions: lon-lat,depth,time)
Subsetter
CMEMS service tool to download a NetCDF file of a selected geographical
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box using values of longitude an latitude, and time range
L2(P)
Level 2 Product: Retrieved (derived) geophysical variables
locations, e.g. SST satellite sensor observation.
L3(P)
Level 3 Product: Composite of L2P for a period of time, mapped on uniform
spacetime grid scales, usually with some completeness and consistency (e.
g., missing points interpolated, complete regions mosaicked together from
multiple orbits, etc.). (Ref: Wikipedia – Remote Sensing)
L3C
Collated
L3S
Supercollated
L4ARC
The Level 4 Arctic SST analysis described in this document
L4(P)
Level 4 Product: Model output or results from analyses of lower level data
(i. e., variables that were not measured by the instruments but instead are
derived from these measurements. Ref: Wikipedia – Remote Sensing). E.g.
forecasts and the L4ARC product described in this document.
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TABLE OF CONTENTS
I
Introduction .................................................................................................................................................... 7
I.1 Scope .............................................................................................................................................................. 7
I.2 Purpose .......................................................................................................................................................... 8
I.3 Applicable Documents.................................................................................................................................. 8
I.4 Reference Documents ................................................................................................................................... 9
II
SST Level 3 Processing Chain and Algorithms ........................................................................................... 10
V1 Algorithm .................................................................................................................................................... 10
II.1 Collection of inputs ................................................................................................................................... 10
II.2 Algorithms for L3C and L3S production................................................................................................ 11
II.2.1
Creation of corrected mono-sensor L3C........................................................................................... 12
II.2.2
Creation of multi-sensor L3S ........................................................................................................... 13
II.3 Graphical examples of L3C and L3S products ...................................................................................... 14
III
II.3.1
L3C products: adjusted SST and bias ............................................................................................... 14
II.3.2
L3S products: adjusted SST, bias and origin sensor ......................................................................... 17
SST Level 3 Products Description ........................................................................................................... 19
III.1 Common characteristics ......................................................................................................................... 19
III.2 L3C products ........................................................................................................................................... 19
III.3 L3S products ............................................................................................................................................ 19
IV
Products Access ............................................................................................................................................ 20
IV.1 Access to near real-time products .......................................................................................................... 20
IV.2 NetCDF V3.0 common data product file structure ............................................................................... 20
IV.3 NetCDF L3C global attributes ............................................................................................................... 22
IV.4 NetCDF L3C variables attributes .......................................................................................................... 24
IV.5 NetCDF L3S global attributes ................................................................................................................ 34
IV.6 NetCDF L3S variables attributes ........................................................................................................... 37
V
Nomenclature of Files .................................................................................................................................. 48
V.1 Nomenclature of files when downloaded through the CMEMS Web Portal Subsetter Service ......... 48
V.2 Nomenclature of files when downloaded through the CMEMS Web Portal CMEMS FTP Service 49
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INTRODUCTION
I.1 Scope
This document provides users with practical information on the SST TAC-WITS level 3 products over European Seas:

SST-EUR_L3S_NRT_OBSERVATIONS_010_009_a

SST-EUR_L3C_NRT_OBSERVATIONS_010_009_b
Both products can be downloaded through SUBSETTER and CMEMS-FTP (see section V).
The CMEMS system is composed of various sub-systems, among which the Monitoring and Forecast Centers (MFCs), in
charge of producing analyses and forecasts of the ocean state, and the Thematic Assembly Centers (TACs), in charge of
producing satellite and in-situ observations-based products.
The OSI TAC architecture for SST products is based on 6 Production Units and 1 Dissemination Unit:
SST TAC Unit (location)
Production Unit
UK Met Office (Exeter)
X
IFREMER (Brest)
X
CNR (Roma)
X
DMI (Copenhagen)
X
Met.no (Oslo)
X
Météo-France (Lannion)
X
Dissemination Unit
X
CNR (Roma) Dissemination Unit
Françoise Orain
B. Hackett
is distributing all SST products from IFREMER (Brest),metno(Oslo) DMI (Copenhagen), and Météo-France (Lannion)
Production Units.
Some quality monitoring and validation statistics of the SST TAC near real-time products are displayed under graphical
form on the SST TAC calibration/validation web site (http//www.marine.copernicus.eu).
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I.2 Purpose
This document provides to CMEMS users practical information on the SST TAC level 3 products over European Seas (SSTEUR_L3S_NRT_OBSERVATIONS_010_009_a and SST-EUR_L3C_NRT_OBSERVATIONS_010_009_b products), which are
processed at Météo-France Centre de Météorologie Spatiale (M-F/Centre de Meteorologie Spatiale). Similar documents
are available for the SST products processed by other OSI TAC SST Production Units.
Chapter II describes the processing steps and of the algorithms used to derive mono- (L3C) and multi-sensor (L3S) level 3
SST products at M-F/CMS, and provides some graphical examples of the products.
Chapter III presents some general characteristics of the products.
Information about near real-time and archived products access, as well as the detailed descriptions of the netCDF
format used are provided in Chapter IV.
The detailed nomenclature of file names is given in Chapter V.
I.3 Applicable Documents
Ref.
Document Name
Document Reference
Issue
Date
[AD.1]
Fast Track Service Specification
MYO-TOP-FTSS
2.3
March 2010
[AD.2]
System Integration, Verification,
Validation Plan
MYO-TOP-SIVVP
2.1
May 2010
[AD.3]
MyOcean Glossary of Terms
MYO-TOP-GLOS
1.1
May 2010
[AD.4]
SST TAC sub-system requirements
document
MYO-ARC-SRD-1-0-SSTTAC
1.0
May 2010
[AD.5]
SST TAC sub-system integration
and verification plan
MYO-SIVP-0-1-SST-TAC
0.1
September
2010
[AD.6]
SST TAC sub-system calibration
report
MYO-CR-1-0-SST-TAC
1.0
March 2010
[AD.7]
SST TAC sub-system validation
report
MYO-VR-0-0-SST-TAC
0.0
April 2011
Table I.3.1 Applicable documents
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I.4 Reference Documents
Ref.
[RD.1]
Document Name
Document
Reference
Issue
Date
GHRSST/17
GDSv1
Revision
1.6
April 2005
GDS2.0_TechnicalS
pecifications_V2.0.
doc
02.007
October 2010
FP7 call : WORK PROGRAMME 2007
COOPERATION
THEME 9 : SPACE
[RD.2]
DRAFT GUIDE FOR APPLICANTS
Theme 9: SPACE
COLLABORATIVE PROJECT
Call identifier: FP7-SPACE-2007-1
[RD.3]
The Recommended GHRSST-PP Data
Processing Specification
GDS (Version 1 revision 1.6)
http://www.ghrsst.org/files/download.php
?m=documents&f=GDS-v1.0-rev1.6.pdf
[RD.4]
The Recommended GHRSST Data
Specification (GDS) Revision 2.0
GDS 2.0 Technical Specifications
http://www.ghrsst.org/files/download.php
?m=documents&f=GDS2.0_TechnicalS
pecifications_v2.0.pdf
Table I.4.1 Reference documents
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SST LEVEL 3 PROCESSING CHAIN AND ALGORITHMS
V1 Algorithm
L2
ancillary
buoys
Ingestion
L2P
L3C
Supply
L4
mm
33C,
L3S
L3C L3S
Dissemination
Generation L2P ancillary
Control system
Generation non corrected Collated L3C
Corrector /
Correction
L3C corrected
Supercollated
L3S merged
Optional Analysis : Generation L4
Figure II.1 Schematic diagram of the operational CMEMS SST processing chain at M-F/CMS
Figure II.1 shows the different steps for the creation of products at M-F/CMS. Each step of this processing is described
afterwards.
II.1 Collection of inputs
The following inputs are collected for input to L3 EUR:
SST satellite data: A collection of the original level 2 product (L2P) data from different producers (NASA, NOAA,
IFREMER, EUMETSAT OSI-SAF, and ESA) in GHRSST compliant format is collected. Currently the format of the collected
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data is GHRSST GDS V1.6 [RD-3] and GDSV2 [RD- 4] compliant. The chain will be adapted to handle the new GHRSST GDS
V2.0 [RD-4] format. The L2P GDS V1.6 detailed format specifications are provided in [RD-3].
- SST satellite data: a collection of the original L2P or L3P mono-sensor products data from different producers (NASA,
NOAA, IFREMER, EUMETSAT, ESA ,JAXA…) in GHRSST compliant format is needed. So far the format of the collected data
is GHRSST GDS V1.6 [RD-3] compliant. An adaptation of the chain to the new GHRSST.0 [RD-4] format made at the end
of 2012. L2P and L3P are identical, “L2P” refer to products in satellite projection and “L3P” to products re-mapped onto
a fixed geographical projection. The L2P or L3P GDS V1.6 detailed format specifications are provided in [RD-3].
According to GHRSST convention for infra-red derived products, confidence levels on a 6 value scale (proximity
confidence variable : 0 unprocessed, 1 cloudy , 2 bad, 3 suspect, 4 acceptable, 5 excellent) are used as predictors of the
errors. It is recommended not to use the confidence value 2 for quantitative use. Usable data are those with confidence
values 3, 4 and 5. All L3P/L2P are provided with Sensor Specific Error Statistics (SSES_bias and SSES_std variables) that
give an estimate of the errors at pixel level. In addition, the difference between the local temperature and the last
available analysis is given at pixel level (DT_analysis variable).
- MSG/SEVIRI derived SSTs is available as a fine scale hourly product in GDS V2 format. The chain ingests a 5 km
resolution product.
- Ancillary data
- climatologies: the mean and minimum SST climatologies used, at about 0.04° resolution, have been derived from the
OSTIA climatology OSTIARAN . The Pathfinder 5-daily climatology produced by Casey and Cornillon (1999), with some
post-processing performed by IFREMER and M-F/CMS (missing data filling, smoothing) could be used if some problems
appear on Ostia Climatology.
All L2P data are provided with Sensor Specific Error Statistics (SSES_bias and SSES_std variables) that give an estimate of
the systematic and random errors at pixel level. In addition, quality level flags are provided. The SSES bias has been
subtracted in the data processing.
The L2P data currently used in L3S and L3C include: infra-red data from the AVHRR instruments on board METOP-A ,
NOAA-18 and -19 satellites. Microwave data from the AMSRE instrument on board Aqua was included until the sensor
failed in October 2011. Data from AATSR on board ENVISAT was also included until it lost contact in April 2012.
Upgraded versions of the AMSRE and AATSR sensors will provide SST in the future, and we plan to include these data,
given acceptable quality.
Sea-ice field data from the EUMETSAT OSI-SAF are used.
II.2 Algorithms for L3C and L3S production
L3C non corrected products are 24 hourly syntheses centred at 00 UTC. One L3C product is built per sensor and per day.
They are built progressively (when a new L2P/L3P is ready to contribute) as follows. All L3C products are built during day
D for the night between D-2 and D-1.
1- Creation of the reference L3C: it is METOP_B/AVHRR no back-up corrector at 0.02 ° horizontal resolution. By
definition, the reference sensor is not corrected. NOTE: From the 09/03/2016 the corector used is METOP_B/AVHRR
.Since 02/11/2010 the corrector used was METOP_A/AVHRR because AATSR after its changed orbital position never
gave such good statistics than before and than METOP_A.
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2- Creation of non corrected L3C products at the horizontal resolution of the L2P/L3P input products or at minimum of
0.02 ° resolution.
The following rules have been adopted to keep the best pixel if they are several possibilities for the same grid:
- if L3P input product is on a regular lat/lon grid, there is no re-projection.
- if L2P/L3P input product is not on a regular lat/lon grid, there is a re-projection onto a regular lat/lon grid at a
horizontal resolution close to the one of the input product.
The pixels chosen from L2P/L3P input product to generate L3C product are selected with the following criteria
(this is configurable for each L2P/L3P input product in the chain):
Quality_min < proximity_confidence < quality_max
ABS(SSES_bias) < bias_max
SSES_std < sigma_max
Dt_analysis_min < Dt_analysis < Dt_analysis_max
Suppression of pixels likely to be contaminated by diurnal warming
Control using other ancillary fields (not used in the current chain configuration)
Confidence_flag
Sun_zenithal_angle test
Satellite_zenithal_angle < maximum_satellite_zenithal_angle
If there are still several pixels for the same location after applying the selection criteria, the following hierarchy
is used:
Best proximity_confidence
ABS(Dt_diurne) minimum
Sun_zenithal_angle maximum
Satellite_zenithal_angle minimum
Time (the nearest to 00 UTC)
If several pixels are still equally good, a mean of the best quality pixels is attributed to the L3C pixel.
II.2.1
Creation of corrected mono-sensor L3C
The correction is based on the calculation of biases between the reference L3C and the non corrected L3C. A reference
sensor is chosen to eliminate, as much as possible, the regional biases that are present in most of the satellite SSTs.
METOP has been chosen as reference sensor because it shows minimum biases at global level. There is no corrector
possible back-up solution over the European Seas.
A daily bias file is produced on native grid of sensor to be corrected, containing SSTsensor – SSTreference and timesensor –
timereference differences (in the past until 02.11.2010 the case of AATSR (the reference corrector), a constant + 0.2° skin© EU Copernicus Marine Service – Public
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to-bulk correction is applied to get the reference SST). If the resolution of the reference sensor is higher than the one
the sensor to be corrected, the bias is computed using an average of the reference SSTs. Otherwise, there is a
duplication of reference SSTs. If  SSTsensor - SSTreference  > bias_max _admission, there is a suspicion of error and the SST is
assigned to missing value in the non corrected L3C. Because of the limited number of locations where SST sensor –
SSTreference differences are available, daily bias files are then aggregated over 10 days. Then a calculation of bias fields is
performed at 0.5° horizontal resolution using an optimal analysis scheme with the following parameters:
- Noise (observation error variance) to signal ratio: 0.1
- Influence radius for the observation selection: 1000 km
- Horizontal correlation scale: 500 km in both x and y directions
- Time correlation scale: 10 days
The results of the optimal analysis (sensor bias and objective analysis error estimate at 0.5° horizontal resolution) are
then interpolated (bilinear interpolation) at the resolution of the sensor to be corrected. Finally, the mono-sensor L3C
products are appended with the following variables: adjusted_sea_surface_temperature (= sea_surface_temperature –
bias_to_reference_sst), bias_to_reference_sst and bias_to_reference_sst_confidence. A detailed description of all L3C
netCDF variables and attributes is given in Annex 1.
NB: some L3C products could be absent some days, although the processing chain is working nominally. It can be due to
the absence of selected SST pixels from a given sensor in the processing area (bad quality pixels, missing or delayed
orbits etc…), or to the lack of match-ups between the non corrected and the reference sensor during the last ten days to
derive a bias correction (too many clouds for instance). However, in such a case, the processing chain is still providing a
L3S multi-sensor product, using only the available corrected L3C products.
II.2.2
Creation of multi-sensor L3S
After all the corrected collated and the collated references have been created, a multi-sensor synthetic merged product
(L3S) is produced, with the following steps:
1- All L3C are remapped to the final horizontal resolution of the L3S product (0.02°):
- if the L3C horizontal resolution is higher than 0.02°, the final SST value is a mean based on the best confidence
level, and the other variables are averaged in a consistent way (this case does not exist today but can happen in the
future with new sensors).
- if the L3C horizontal resolution is lower than 0.02, the distribution is done to the nearest neighbour.
2- Each pixel is then selected according to the following rules:
- Sensor priority is driven by 3 groups, and 13 ranks (see table III.2.3.1):
Group 1: ranks 1, 2
Group 2: ranks 3-10
Group 3: ranks 11-14
The pixels of group A have priority on group B and C. For group B and C, SST is used only if
ABS(bias_to_reference_sst) < bias_max (configuration). The L3S pixel is filled first with the selected value from the
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lowest priority sensor, and is then superseded by the selected value from a higher priority sensor only if
ABS(bias_to_reference_sst(old)) - ABS(bias_to_reference_sst(new)) > marge_bias (configuration).
- In case of equal priority, the nearest pixel to 00 UTC (configuration) in time is selected.
The original SST (sea_surface_temperature) value of the selected pixel, as well as the corresponding bias
(bias_to_reference_sst and bias_to_reference_sst_confidence) and corrected SST (adjusted_sea_surface_temperature)
values are kept in the final L3S file. A detailed description of all L3S netCDF variables and attributes is given in Annex 1.
SST sensor
group rank
AVHRR_METOP_B
1
2
SEVIRI_1_1H_SST
1
3
VIIRS_SST_NPP
1
4
AVHRR19_L
2
6
AVHRR18_G
2
7
MODIS_A
3
8
MODIS_T
3
9
AMSR2_NRT
3
10
Table II.2.2.1 Group and rank of the various SST sensors used in the prioritisation process in the building of
the multi-sensor L3S product. In the current configuration of the processing chain, buoy measurements (group 1
rank 1) are not used
II.3 Graphical examples of L3C and L3S products
II.3.1
L3C products: adjusted SST and bias
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Reference corrector
METOP_B
METOP
SEVIRI
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VIIRS_NPP
Figure II.3.1.1 Examples of mono-sensor L3C products on 6 March 2016 (from top to bottom:
AVHRR_METOP_B (reference corrector), and SEVIRI_1H and VIIRS_NPP). The adjusted_sea_surface_temperature
variable is plotted on the left, and the bias_to_reference_sst on the right (except for AVHRR_METOP_B, which is
used as reference sensor, and hence is not bias corrected).
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L3S products: adjusted SST, bias and origin sensor
Figure II.3.2.1 Example of multi-sensor L3S products on 6 March 2016 (from top to bottom:
adjusted_sea_surface_temperature, bias_to_reference_sst and source_of_sst variables, frequency histogram of
sources of sst).
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Sensor
Code
Buoys
31
AVHRR_METOP_B
56
SEVIRI_1_1H_SST
29
AVHRR19_L
9
VIIRS_NPP
54
AVHRR18_G
27
MODIS_A
50
MODIS_T
51
AMSR2_NRT
55
Table II.3.2.1 Code of sensor in L3S product on 8th of March 2016
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III SST LEVEL 3 PRODUCTS DESCRIPTION
III.1 Common characteristics
L3C and L3S products over European Seas are daily products. The adjusted_sea_surface_temperature variable which
they provide represents an estimate of the night time subskin temperature. They are delivered on a regular lat/lon grid,
from 40 W to 55 E and 20 S to 70 N (at a 0.02° horizontal resolution for L3S products, and at a horizontal resolution
depending on the sensor for L3C products), in netCDF format.
III.2 L3C products
A detailed description of L3C variables and attributes is provided in sections IV.4 and IV.5.
III.3 L3S products
A detailed description of L3S variables and attributes is provided in sections IV.6 and IV.7.
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IV PRODUCTS ACCESS
IV.1 Access to near real-time products
CMEMS Level 3 SST products over European Seas are referenced as follows in the CMES catalogue, accessible through
the Copernicus web site (http //www.marine.copernicus.eu/ ):
-
mono-sensor L3C products : SST_EUR_SST_L3C_NRT_OBSERVATIONS_010_009_b
-
multi-sensor L3S products : SST_EUR_SST_L3S_NRT_OBSERVATIONS_010_009_a
They are available in near real-time to CMEMS registered users through CMEMS FTP and SUBSETTER.
The Copernicus Service Desk is the single point of contact for Copernicus Users for all issues relating to CMEMS
services. It can be reached at : [email protected]
The retention time of CMEMS-Level 3 SST products over European Seas is:
-
mono-sensor L3C products SST_EUR_SST_L3C_NRT_OBSERVATIONS_010_009_b: one week on FTP and
SUBSETTER server
-
multi-sensor L3S products SST_EUR_SST_L3S_NRT_OBSERVATIONS_010_009_a: several years on FTP and
SUBSETTER server
A permanent archive of CMEMS Level 3 SST products over European Seas is maintained at Météo-France/CMS(Centre
de Météorologie Spatiale). To access these archived products, please contact , CMEMS service desk
[email protected] L3C and L3S detailed Products Format Description
The GHRSST-PP data files themselves have been chosen to follow the Climate and Forecast netCDF conventions because
these conventions provide a practical standard for storing oceanographic data, and have already been adopted for the
Data Sharing Pilot project within GODAE. The netCDF data format is extremely flexible, self describing and has been
adopted as a de-facto standard for many operational oceanography systems.
This appendix provides a detailed description of CMEMS L3C and L3S SST products format, which has many
commonalities with the GHRSST GDS V2 format specification compliant with the GHRSST XIII format specification [RD4].
IV.2 NetCDF V3.0 common data product file structure
The GHRSST-PP netCDF v3.0 files are based on the attribute data tags defined by the Cooperative Ocean/Atmosphere
Research Data Service (COARDS) and climate and forecast (CF) metadata conventions. The CF convention generalises
and extends the COARDS convention but relaxes the COARDS constraints on dimension order and specifies methods for
reducing the size of datasets. The purpose of the CF conventions is to require conforming datasets to contain sufficient
metadata that they are self-describing in the sense that each variable in the file has an associated description of what it
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represents, including physical units if appropriate, and that each value can be located in space (relative to earth-based
coordinates) and time (NetCDF Climate and Forecast (CF) Metadata Conventions, Version 4 2009 compatible version 3).
The following web reference documents are applicable to GDS netCDF file formats
netCDF
http //www.unidata.ucar.edu/packages/netcdf/
CF conventions
http //www.cgd.ucar.edu/cms/eaton/cf-metadata/CF-working.html
COARDS conventions
http //ferret.wrc.noaa.gov/noaa_coop/coop_cdf_profile.html
UDUNITS
http //www.unidata.ucar.edu/packages/udunits/
GDS data files have a netCDF specification that is configured with four common variables as shown in Table VI.1.1.
Dimensions
Mandatory
(e.g., i x j)
[i x j] geolocation data
Mandatory
(specific to Gridded data set)
[i x j] array of SST data
Mandatory
(e.g., SST, wind speed etc)
[i x j] array of confidence flags
Mandatory
(specific to variable data set)
Global attributes
Mandatory
Table IV.3.1 Schematic representations of a GDS netCDF file identifying the major file components.
In the context of netCDF, a variable refers to data stored in the file as a vector or as a multidimensional array. Global
attributes are used to hold information which applies to the whole file, such as the data set title. The global attributes
shown in the example are the minimum set required for a valid GDS netCDF file. Each individual variable can also have
its own attributes, referred as variable attributes. The dimensions of each variable must be explicitly declared in the
dimension section.
In this example, the variable SST consists of a 2-D array [i x j] of sea-surface temperature measurements. In order to
save disk space, the 32-bit floating point temperature measurements have been scaled onto 16-bit short integers using
the _add_offset and _scale_factor variable attributes. The floating point SST values can be recovered using
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SSTfloat = (_scale_factor  SSTshort ) + _add_offset
The values used for _add_offset and _scale_factor are defined by the team generating the netCDF data file.
Also associated with the SST variable are a number of additional variable attributes describing the units, a longer
descriptive version of the variable name, and a fill value. S.I. units should be used and described by a character string
which is compatible with the Unidata UDUNITS package. The SST variable fill value is used to indicate array elements
that do not contain a valid measurement. Several different attributes and associated tags can be defined for GHRSST-PP
variables.
Note that it is relatively easy to extend the format of a netCDF data file as another variable data set may be appended to
the end of the file without modifying the original file format structure.
IV.3 NetCDF
L3C global attributes
Global_attributes
product_version
"1.0" ;
platform
"Envisat, AVHRR, AVHRR_GAC, SEVIRI, GEOS_Imager, Aqua, Terra,
MTSAT1R, MSG1,TRMM NPP" ;
sensor
"AATSR, AVHRR, AVHRR_GAC, SEVIRI, GOES_Imager, MODIS, TMI
VIIRS" ;
comment
"WARNING: Some applications are unable to properly handle signed byte
values. If values are encountered > 127, please substract 256 from this
reported value." ;
source
"ATS_NR_2P, AVHRRMTA, NAR17_SST, NAR18_SST, AVHRR17_L,
AVHRR_18_L, AVHRR18_G, SEVIRI_1H_SST, GOES_12_1H_SST,
AMSRE, TMI, MODIS_A, MODIS_T" ;
title
"Euro SST, L3C, VIIRS_SST_NPP_NAR, 0.02deg daily, Meteo-France" ;
summary
"A merged, multi-sensor- L3S Fondation SST product from Myocean" ;
processing_level
"L3C" ;
Conventions
"CF-1.4" ;
references
"http://www.Myocean.eu.org/products-services.html" ;
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institution
"CMEMS" ;
history
"20130209120000-OSISAF-L3C_GHRSST-SSTsubskin-SEVIRI_SSTssteqc_meteosat10_20130209_120000-v02.0-fv01.0.nc;20130209130000OSISAF-L3C_GHRSST-SSTsubskin-SEVIRI_SSTssteqc_meteosat10_20130209_130000-v02.0--fv01.0.nc;20130210120000OSISAF-L3C_GHRSST-SSTsubskin-SEVIRI_SST………ssteqc_meteosat10_20130210_120000-v02.0-fv01.0.nc" ;
licence
"These data are available free of charge under the GMES data policy." ;
id
= "name_SENSOR -OSITAC-L3C-MYOCEAN2_EUR_daily-v1.0" ;
naming_authority
"org.ghrsst" ;
myocean_id
"SST_EUR_SST_L3C_NRT_OBSERVATIONS_010_009_b" ;
gds_version_id
"2.0" ;
netcdf_version_id
"4.1" ;
date_created
"20130210T000000Z" ;
start_time
"20130209T121126Z" ;
stop_time
"20130210T115642Z" ;
time_coverage_start
"20130209T121126Z" ;
time_coverage_end
"20130210T115642Z" ;
file_quality_level
1b ;
metadata_conventions
"Unidata Oservation Dataset v1.0" ;
metadata_link
"http://data.nodc.noaa.gov/waf/FGDC-GHRSST_all- CMScolated2kmMYO-L3C-EURSEAS_AdjustedSST -v1.html" ;
keywords
"Oceans > Ocean Temperature > Sea Surface Temperature" ;
keywords_vocabulary
"NASA Global Change Master Directory (GCMD) Science Keywords" ;
standard_name_vocabulary
"NetCDF Climate and Forecast (CF) Metadata Convention" ;
westernmost_longitude
"-40.000" ;
easternmost_longitude
"55.000" ;
southernmost_latitude
"20.000" ;
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northernmost_latitude
"70.000" ;
spatial_resolution
"0.050 degree" ;
geospatial_lat_units
"degrees north" ;
geospatial_lat_resolution
"0.005" ;
geospatial_lon_units
"degrees east" ;
geospatial_lon_resolution
"0.005" ;
acknowledgment
"Please acknowledge the use of these data with the following statement:
These data were provided by GHRSST and the MyOcean Regional Data
Assembly Centre" ;
creator_name
"MyOcean" ;
creator_email
"[email protected]" ;
creator_url
"http://www.myocean.eu.org/" ;
project
"Group for High Resolution SST" ;
publisher_name
"GHRSST Project Office" ;
publisher_url
"http://www.ghrsst.org" ;
publisher_email
"[email protected]" ;
cdm_data_type
"grid" ;
time_stamp
"2013021000-24" ;
Corrected
1b ;
Table IV.4.1 Global attributes for CMEMS L3C EUR SST products in netCDF format ((ex : SEVIRI_1H L3C product on 10
February 2013)
IV.4 NetCDF
L3C variables attributes
Variables attributes
dimensions:
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time = 1 ;
lat = 1000 ;
lon = 1900 ;
variables:
int time(time) ;
time:long_name = "reference time of sst file" ;
time:standard_name = "time" ;
time:units = "seconds since 1981-01-01 00:00:00" ;
time:calendar = "gregorian" ;
time:axis = "T" ;
float lat(lat) ;
lat:standard_name = "latitude" ;
lat:units = "degrees_north" ;
lat:valid_min = -90.f ;
lat:valid_max = 90.f ;
lat:axis = "Y" ;
lat:reference = "geographical coordinates, WGS84 projection" ;
float lon(lon) ;
lon:standard_name = "longitude" ;
lon:units = "degrees_east" ;
lon:valid_min = -180.f ;
lon:valid_max = 180.f ;
lon:axis = "X" ;
lon:reference = "geographical coordinates, WGS84 projection" ;
short or_latitude(time, lat, lon) ;
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or_latitude:long_name = "original latitude of the SST value" ;
or_latitude:units = "degrees_north" ;
or_latitude:_FillValue = -32768s ;
or_latitude:valid_min = -9000s ;
or_latitude:valid_max = 9000s ;
or_latitude:add_offset = 0.f ;
or_latitude:scale_factor = 0.01f ;
short or_longitude(time, lat, lon) ;
or_longitude:long_name = "original longitude of the SST value" ;
or_longitude:units = "degrees_east" ;
or_longitude:_FillValue = -32768s ;
or_longitude:valid_min = -18000s ;
or_longitude:valid_max = 18000s ;
or_longitude:add_offset = 0.f ;
or_longitude:scale_factor = 0.01f ;
short or_number_of_pixels(time, lat, lon) ;
or_number_of_pixels:long_name = "number of pixels from the L2Ps contributing to the SST value" ;
or_number_of_pixels:_FillValue = -32768s ;
int sst_dtime(time, lat, lon) ;
sst_dtime:long_name = "time difference from reference time" ;
sst_dtime:units = "seconds" ;
sst_dtime:_FillValue = -2147483648 ;
sst_dtime:valid_min = -2147483647 ;
sst_dtime:valid_max = 2147483647 ;
sst_dtime:add_offset = 0.f ;
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sst_dtime:scale_factor = 1.f ;
sst_dtime:comment = "time plus sst_dtime give seconds after 00:00:00 UTC january1, 1981" ;
short sea_surface_temperature(time, lat, lon) ;
sea_surface_temperature:long_name = "sea surface temperature" ;
sea_surface_temperature:standard_name = "sea_surface_temperature" ;
sea_surface_temperature:units = "kelvin" ;
sea_surface_temperature:_FillValue = -32768s ;
sea_surface_temperature:valid_min = -200s ;
sea_surface_temperature:valid_max = 5000s ;
sea_surface_temperature:add_offset = 273.15f ;
sea_surface_temperature:scale_factor = 0.01f ;
byte diurnal_warming(time, lat, lon) ;
diurnal_warming:long_name = "diurnal warming" ;
diurnal_warming:units = "kelvin" ;
diurnal_warming:_FillValue = -128b ;
diurnal_warming:valid_min = -127b ;
diurnal_warming:valid_max = 127b ;
diurnal_warming:add_offset = 0.f ;
diurnal_warming:scale_factor = 0.1f ;
short l2p_flags(time, lat, lon) ;
l2p_flags:long_name = "L2P flags" ;
l2p_flags:flag_meanings = "microwave land ice lake river sun_glint SST_algorithm_A SST_algorithm_B
SST_algorithm_C SST_algorithm_D" ;
l2p_flags:comments = "These flags are important to properly use the data" ;
byte quality_level(time, lat, lon) ;
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quality_level:long_name = "quality_level" ;
quality_level:flag_meanings = "no_data bad_data worst_quality low_quality acceptable_quality
best_quality"
;
quality_level:comment = "These are overall quality indicators and are used for all GHRSST SSTs." ;
byte sses_bias(time, lat, lon) ;
sses_bias:long_name = "SSES bias estimate" ;
sses_bias:units = "kelvin" ;
sses_bias:_FillValue = -128b ;
sses_bias:valid_min = -127b ;
sses_bias:valid_max = 127b ;
sses_bias:add_offset = 0.f ;
sses_bias:scale_factor = 0.02f ;
sses_bias:comment = "bias estimate derived using the techniques described at http://www.ghrsst.org/SSESDescription-of-schemes.html" ;
byte sses_standard_deviation(time, lat, lon) ;
sses_standard_deviation:long_name = "SSES standard deviation" ;
sses_standard_deviation:units = "kelvin" ;
sses_standard_deviation:_FillValue = -128b ;
sses_standard_deviation:valid_min = -127b ;
sses_standard_deviation:valid_max = 127b ;
sses_standard_deviation:add_offset = 2.54f ;
sses_standard_deviation:scale_factor = 0.02f ;
sses_standard_deviation:comment = "bias estimate derived using the techniques described at
http://www.ghrsst.org/SSES-Description-of-schemes.html" ;
short bias_to_reference_sst(time, lat, lon) ;
bias_to_reference_sst:long_name = "bias error derived from reference" ;
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bias_to_reference_sst:units = "kelvin" ;
bias_to_reference_sst:_FillValue = -32768s ;
bias_to_reference_sst:valid_min = -32767s ;
bias_to_reference_sst:valid_max = 32767s ;
bias_to_reference_sst:add_offset = 0.f ;
bias_to_reference_sst:scale_factor = 0.01f ;
bias_to_reference_sst:comment = "This represent the bias estimate derived from comparison between the original
SST (native SSES being applied) and the reference sensor SST (original SST - reference SST)" ;
short standard_deviation_to_reference_sst(time, lat, lon) ;
standard_deviation_to_reference_sst:long_name = 0b ;
standard_deviation_to_reference_sst:units = "kelvin" ;
standard_deviation_to_reference_sst:_FillValue = -32768s ;
standard_deviation_to_reference_sst:valid_min = -32767s ;
standard_deviation_to_reference_sst:valid_max = 32767s ;
standard_deviation_to_reference_sst:add_offset = 0.f ;
standard_deviation_to_reference_sst:scale_factor = 0.01f ;
standard_deviation_to_reference_sst:comment = "bias estimate derived using the techniques described at
http://www.ghrsst.org/SSES-Description-of-schemes.html" ;
byte bias_to_reference_sst_confidence(time, lat, lon) ;
bias_to_reference_sst_confidence:long_name = "bias error confidence value" ;
bias_to_reference_sst_confidence:_FillValue = -128b ;
byte satellite_zenith_angle(time, lat, lon) ;
satellite_zenith_angle:long_name = "satellite zenith angle" ;
satellite_zenith_angle:units = "degrees" ;
satellite_zenith_angle:_FillValue = -128b ;
satellite_zenith_angle:valid_min = -90b ;
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satellite_zenith_angle:valid_max = 90b ;
satellite_zenith_angle:add_offset = 0.f ;
satellite_zenith_angle:scale_factor = 1.f ;
byte solar_zenith_angle(time, lat, lon) ;
solar_zenith_angle:long_name = "solar zenith angle" ;
solar_zenith_angle:units = "degrees" ;
solar_zenith_angle:_FillValue = -128b ;
solar_zenith_angle:valid_min = -127b ;
solar_zenith_angle:valid_max = 127b ;
solar_zenith_angle:add_offset = 90.f ;
solar_zenith_angle:scale_factor = 1.f ;
solar_zenith_angle:comment = "This variable provides a pixel by pixel description of where aerosol optical depth
were derived from." ;
short adjusted_sea_surface_temperature(time, lat, lon) ;
adjusted_sea_surface_temperature:long_name = "adjusted sea surface temperature" ;
adjusted_sea_surface_temperature:standard_name = "sea_surface_fondation_temperature" ;
adjusted_sea_surface_temperature:units = "kelvin" ;
adjusted_sea_surface_temperature:_FillValue = -32768s ;
adjusted_sea_surface_temperature:valid_min = -300s ;
adjusted_sea_surface_temperature:valid_max = 4500s ;
adjusted_sea_surface_temperature:add_offset = 273.15f ;
adjusted_sea_surface_temperature:scale_factor = 0.01f ;
adjusted_sea_surface_temperature:comment = "priorities: exemple : ATS_NR_2P, AVHHRMTA, NAR17_SST,
NAR18_SST,
AVHRR17_L, AVHRR18_L, AVHRR17_G, AVHRR18_G, SEVIRI_1H_SST, GOES_12_1H_SST,
AMSRE, TMI, MODIS_A, MODIS_T" ;
adjusted_sea_surface_temperature:reference = "AVHRR_METOP_A" ;
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short adjusted_standard_deviation_error(time, lat, lon) ;
adjusted_standard_deviation_error:long_name = "standard deviation error based on L2P SSES and ajustment
method" ;
adjusted_standard_deviation_error:units = "kelvin" ;
adjusted_standard_deviation_error:_FillValue = -32768s ;
adjusted_standard_deviation_error:valid_min = -32767s ;
adjusted_standard_deviation_error:valid_max = 32767s ;
adjusted_standard_deviation_error:add_offset = 0.f ;
adjusted_standard_deviation_error:scale_factor = 0.01f ;
adjusted_standard_deviation_error:comment = "This represent the cumulated errors of SSES and ajustment
method" ;
float sum_sst(time, lat, lon) ;
sum_sst:long_name = "sum of the contributing pixel sst values" ;
sum_sst:units = "kelvin" ;
sum_sst:_FillValue = -1.f ;
sum_sst:valid_min = -200.f ;
sum_sst:valid_max = 200.f ;
sum_sst:add_offset = 0.f ;
sum_sst:scale_factor = 1.f ;
float sum_square_sst(time, lat, lon) ;
sum_square_sst:long_name = "sum of the contributing pixel sst value squares" ;
sum_square_sst:standard_name = "sum_of_contributing_pixel_sst_value_squares_D" ;
sum_square_sst:units = "kelvin2" ;
sum_square_sst:_FillValue = -1.f ;
sum_square_sst:valid_min = 0.f ;
sum_square_sst:valid_max = 50000.f ;
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sum_square_sst:add_offset = 0.f ;
sum_square_sst:scale_factor = 1.f ;
byte wind_speed(time, lat, lon) ;
wind_speed:long_name = "10m wind speed" ;
wind_speed:units = "m.s-1" ;
wind_speed:_FillValue = -128b ;
wind_speed:valid_min = -127b ;
wind_speed:valid_max = 127b ;
wind_speed:add_offset = 0.f ;
wind_speed:scale_factor = 1.f ;
wind_speed:height = "10 m" ;
byte wind_speed_dtime_from_sst(time, lat, lon) ;
wind_speed_dtime_from_sst:long_name = "time difference of the wind speed measurement from SST
measurement" ;
wind_speed_dtime_from_sst:units = "hour" ;
wind_speed_dtime_from_sst:_FillValue = -128b ;
wind_speed_dtime_from_sst:valid_min = -127b ;
wind_speed_dtime_from_sst:valid_max = 127b ;
wind_speed_dtime_from_sst:add_offset = 0.f ;
wind_speed_dtime_from_sst:scale_factor = 0.1f ;
wind_speed_dtime_from_sst:comment = "The hours between the wind speed measurement and the SST
observation" ;
byte sources_of_wind_speed(time, lat, lon) ;
sources_of_wind_speed:long_name = "sources of wind speed" ;
sources_of_wind_speed:_FillValue = -128b ;
sources_of_wind_speed:valid_min = 0b ;
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sources_of_wind_speed:valid_max = 2b ;
sources_of_wind_speed:flag_meanings = "WSP-ESA-ASCAT-V2 WSP-NCEP-Analysis-V3 WSP-ECMWFForecast-V6" ;
sources_of_wind_speed:comment = "This variable provides a pixel by pixel description of where the wind speeds
were derived from." ;
byte sea_ice_fraction(time, lat, lon) ;
sea_ice_fraction:long_name = "sea_ice_fraction" ;
sea_ice_fraction:units = "" ;
sea_ice_fraction:_FillValue = -128b ;
sea_ice_fraction:valid_min = 0b ;
sea_ice_fraction:valid_max = 100b ;
sea_ice_fraction:add_offset = 0.f ;
sea_ice_fraction:scale_factor = 0.01f ;
byte sea_ice_fraction_dtime_from_sst(time, lat, lon) ;
sea_ice_fraction_dtime_from_sst:long_name = "time difference of sea ice fraction measurement from SST
measurement" ;
sea_ice_fraction_dtime_from_sst:units = "hour" ;
sea_ice_fraction_dtime_from_sst:_FillValue = -128b ;
sea_ice_fraction_dtime_from_sst:valid_min = -127b ;
sea_ice_fraction_dtime_from_sst:valid_max = 127b ;
sea_ice_fraction_dtime_from_sst:add_offset = 0.f ;
sea_ice_fraction_dtime_from_sst:scale_factor = 0.1f ;
sea_ice_fraction_dtime_from_sst:comment = "The time difference in hours is estimated from the SST and sea ice
data sets" ;
byte sources_of_sea_ice_fraction(time, lat, lon) ;
sources_of_sea_ice_fraction:long_name = "sources of sea ice fraction" ;
sources_of_sea_ice_fraction:_FillValue = -128b ;
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sources_of_sea_ice_fraction:valid_min = 0b ;
sources_of_sea_ice_fraction:valid_max = 1b ;
sources_of_sea_ice_fraction:flag_meanings = "ICE-NSIDC-AMSRE-V3 ICE-ECMWF-Forecast-V3" ;
sources_of_sea_ice_fraction:comment = "This variable provides a pixel by pixel description of where sea ice
fraction were derived from." ;
Table IV.5.1 Variables attributes for CMEMSan L3C SST products in netCDF format (ex : SEVIRI_1H L3C product on 10
February 2013)
IV.5 NetCDF L3S global attributes
title
"Euro SST, L3S, Multisensor merged, 0.02deg daily,
MeteoFrance" ;
summary
"A merged, multi-sensor- L3S Fondation SST product from
MyOcean" ;
processing_level
"L3S" ;
Conventions
"CF-1.4" ;
references
"http://www.myocean.eu.org/products-services.html" ;
institution
"MyOcean" ;
history
"MyOcean processor XXX.YY;"MyOcean processor
XXX.YY;20130210000000-OSISAF-L3C_GHRSSTSSTsubskin-SEVIRI_1_1H_SST-EURAVHRR_METOP_A_corrected-MYO-005x005_0024-v02fv01.nc;20130210000000-OSISAF-L3C_GHRSSTSSTsubskin-AVHRR_METOP_A-EUR-adjusted-MYO002x002_0024-v02-fv01.nc;20130210000000-JPLL3C_GHRSST-SSTsubskin-AVHRR18_G-EURAVHRR_METOP_A_corrected-MYO-010x010_0024-v02fv01.nc;20130210000000-OSISAF-L3C_GHRSSTSSTsubskin-NAR_AVHRR_NOAA_19-EURAVHRR_METOP_A_corrected-MYO-002x002_0024-v02fv01.nc;20130210000000-JPL-L3C_GHRSST-SSTsubskinTMI-EUR-AVHRR_METOP_A_corrected-MYO025x025_0024-v02-fv01.nc;20130210000000-JPLL3C_GHRSST-SSTsubskin-AVHRR19_L-EUR-
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AVHRR_METOP_A_corrected-MYO-002x002_0024-v02fv01.nc;20130210000000-OSISAF-L3C_GHRSSTSSTsubskin-NAR_AVHRR_NOAA_18-EURAVHRR_METOP_A_corrected-MYO-002x002_0024-v02fv01.nc;20130210000000-JPL-L3C_GHRSST-SSTsubskinMODIS_A-EUR-AVHRR_METOP_A_corrected-MYO002x002_0024-v02-fv01.nc;20130210000000-JPLL3C_GHRSST-SSTsubskin-MODIS_T-EURAVHRR_METOP_A_corrected-MYO-002x002_0024-v02fv01.nc" ;
comment
"WARNING: Some applications are unable to properly
handle signed byte
values. If values are encountered >
127, please substract 256 from this reported value." ;
licence
"These data are available free of charge under the GMES
data policy." ;
id
"OSITAC-L3S-merged_sensors-Myocean2-v1.0" ;
myocean_id
"SST_EUR_SST_L3S_NRT_OBSERVATIONS_010_009_a"
;
product_version
"1.0" ;
uuid
"fdc093c3-4809-44fd-a051-019475dd7c87" ;
gds_version_id
"2.0" ;
netcdf_version_id
"4.1" ;
date_created
"20130210T000000Z" ;
start_time
"20160305T120024Z" ;
stop_time
"20160306T115648Z" ;
time_coverage_start
""20160305T120024Z" ;
time_coverage_end
"20160306T115648Z" ;
file_quality_level
1b ;
source
" AVHRR19_L, AVHRR18_G, SEVIRI_1H_SST,
AMSR2_NRT, MODIS_A,
MODIS_T,AVHRR_METOP_B,VIIRS_NPP" ;
platform
"Envisat, AVHRR, AVHRR_GAC, SEVIRI, GEOS_Imager,
Aqua, Terra, MTSAT1R, MSG1,TRMM" ;
sensor
"AATSR, AVHRR, AVHRR_GAC, SEVIRI, GOES_Imager,
MODIS, TMI,SUOMI," ;
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metadata_conventions
"Unidata Oservation Dataset v1.0" ;
metadata_link
"http://data.nodc.noaa.gov/waf/FGDC-GHRSST_allCMSscolated2km-MYO-L3S-EURSEAS_AdjustedSST v1.html" ;
keywords
"Oceans > Ocean Temperature > Sea Surface Temperature"
;
keywords_vocabulary
"NASA Global Change Master Directory (GCMD) Science
Keywords" ;
standard_name_vocabulary
"NetCDF Climate and Forecast (CF) Metadata Convention"
;
westernmost_longitude
"-40.000" ;
easternmost_longitude
"55.000" ;
southernmost_latitude
"20.000" ;
northernmost_latitude
"70.000" ;
spatial_resolution
"0.020 degree" ;
geospatial_lat_units
"degrees north" ;
geospatial_lat_resolution
"0.005" ;
geospatial_lon_units
"degrees east" ;
geospatial_lon_resolution
"0.005" ;
acknowledgment
"Please acknowledge the use of these data with the following
statement: These data were provided by GHRSST and the
MyOcean Regional Data Assembly Centre" ;
creator_name
"MyOcean" ;
creator_email
"[email protected]" ;
creator_url
"http ://www.myocean.eu.org/" ;
project
"Group for High Resolution SST" ;
publisher_name
"GHRSST Project Office" ;
publisher_url
"http://www.ghrsst.org" ;
publisher_email
"[email protected]" ;
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cdm_data_type
"grid" ;
DSD_entry_id
"SST_EUR_SST_ L3S_OBSERVATIONS_010_009_a" ;
time_stamp
"2013021000-24" ;
rank_table
rank_table = "BUOY_ALL_SST(31,group=1,rank=1)
AVHRR_SST_METOP_A(52,group=1,rank=13)
AVHRR_SST_METOP_B(56,group=1,rank=2)
SEVIRI_1_1H_SST(29,group=1,rank=3)
VIIRS_NPP(54,group=1,rank=4)
AVHRR_SST_NOAA19(39,group=2,rank=5)
AVHRR19_L(09,group=2,rank=6)
AVHRR18_G(26,group=2,rank=7)
MODIS_A(50,group=3,rank=8)
MODIS_T(51,group=3,rank=9)
AMSR2_NRT(55,group=3,rank=10)
VIIRS_SST_NPP_NAR(53,group=3,rank=11)
AVHRR_SST_NOAA19_NAR(08,group=3,rank=12) "
"BUOY_ALL_SST(31,group=1,rank=1)
Table IV.6.1 Global attributes for Myocean L3C SST products in netCDF format (ex: product on 6 th March 2016)
IV.6 NetCDF
L3S variables attributes
dimensions:
time = 1 ;
lat = 2500 ;
lon = 4750 ;
variables:
int time(time) ;
time:long_name = "reference time of sst file" ;
time:standard_name = "time" ;
time:units = "seconds since 1981-01-01 00:00:00" ;
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time:calendar = "gregorian" ;
time:axis = "T" ;
float lat(lat) ;
lat:standard_name = "latitude" ;
lat:units = "degrees_north" ;
lat:valid_min = -90.f ;
lat:valid_max = 90.f ;
lat:axis = "Y" ;
lat:reference = "geographical coordinates, WGS84 projection" ;
float lon(lon) ;
lon:standard_name = "longitude" ;
lon:units = "degrees_east" ;
lon:valid_min = -180.f ;
lon:valid_max = 180.f ;
lon:axis = "X" ;
lon:reference = "geographical coordinates, WGS84 projection" ;
byte source_of_sst(time, lat, lon) ;
source_of_sst:long_name = "SST sensor origine" ;
source_of_sst:_FillValue = -128b ;
source_of_sst:comment = "ATS_NR_2P : 1, AVHRR17_G : 6, AVHRR17_L : 7, NAR17_SST : 8,
AVHRR19_L : 09, AMSRE : 14, TMI : 15, AVHRR18_G : 26, AVHRR18_L : 27, NAR18_SST : 28,
SEVIRI_1_1H_SST : 29, GOES_12_1H_SST : 30, BUOY_ALL_SST : 31, AVHRR_NOAA_19 : 39, MODIS_A : 50,
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MODIS_T : 51, AVHRR_METOP_A : 52" ;
short or_latitude(time, lat, lon) ;
or_latitude:long_name = "original latitude of the SST value" ;
or_latitude:units = "degrees_north" ;
or_latitude:_FillValue = -32768s ;
or_latitude:valid_min = -9000s ;
or_latitude:valid_max = 9000s ;
or_latitude:add_offset = 0.f ;
or_latitude:scale_factor = 0.01f ;
short or_longitude(time, lat, lon) ;
or_longitude:long_name = "original longitude of the SST value" ;
or_longitude:units = "degrees_east" ;
or_longitude:_FillValue = -32768s ;
or_longitude:valid_min = -18000s ;
or_longitude:valid_max = 18000s ;
or_longitude:add_offset = 0.f ;
or_longitude:scale_factor = 0.01f ;
short or_number_of_pixels(time, lat, lon) ;
or_number_of_pixels:long_name = "number of pixels from the L2Ps contributing to the SST value" ;
or_number_of_pixels:_FillValue = -32768s ;
int sst_dtime(time, lat, lon) ;
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sst_dtime:long_name = "time difference from reference time" ;
sst_dtime:units = "seconds" ;
sst_dtime:_FillValue = -2147483648 ;
sst_dtime:valid_min = -2147483647 ;
sst_dtime:valid_max = 2147483647 ;
sst_dtime:add_offset = 0.f ;
sst_dtime:scale_factor = 1.f ;
sst_dtime:comment = "time plus sst_dtime give seconds after 00:00:00 UTC january 1, 1981" ;
short sea_surface_temperature(time, lat, lon) ;
sea_surface_temperature:long_name = "sea surface temperature" ;
sea_surface_temperature:standard_name = "sea_surface_temperature" ;
sea_surface_temperature:units = "kelvin" ;
sea_surface_temperature:_FillValue = -32768s ;
sea_surface_temperature:valid_min = -200s ;
sea_surface_temperature:valid_max = 5000s ;
sea_surface_temperature:add_offset = 273.15f ;
sea_surface_temperature:scale_factor = 0.01f ;
byte diurnal_warming(time, lat, lon) ;
diurnal_warming:long_name = "diurnal warming" ;
diurnal_warming:units = "kelvin" ;
diurnal_warming:_FillValue = -128b ;
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diurnal_warming:valid_min = -127b ;
diurnal_warming:valid_max = 127b ;
diurnal_warming:add_offset = 0.f ;
diurnal_warming:scale_factor = 0.1f ;
byte quality_level(time, lat, lon) ;
quality_level:long_name = "quality_level" ;
quality_level:flag_meanings = "no_data bad_data worst_quality low_quality acceptable_quality
best_quality" ;
quality_level:comment = "These are overall quality indicators and are used for all GHRSST SSTs." ;
byte sses_bias(time, lat, lon) ;
sses_bias:long_name = "SSES bias estimate" ;
sses_bias:units = "kelvin" ;
sses_bias:_FillValue = -128b ;
sses_bias:valid_min = -127b ;
sses_bias:valid_max = 127b ;
sses_bias:add_offset = 0.f ;
sses_bias:scale_factor = 0.02f ;
sses_bias:comment = "bias estimate derived using the techniques described at http://www.ghrsst.org/SSESDescription- of-schemes.html" ;
byte sses_standard_deviation(time, lat, lon) ;
sses_standard_deviation:long_name = "SSES standard deviation" ;
sses_standard_deviation:units = "kelvin" ;
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sses_standard_deviation:_FillValue = -128b ;
sses_standard_deviation:valid_min = -127b ;
sses_standard_deviation:valid_max = 127b ;
sses_standard_deviation:add_offset = 2.54f ;
sses_standard_deviation:scale_factor = 0.02f ;
sses_standard_deviation:comment = "bias estimate derived using the techniques described at
http://www.ghrsst.org/SSES-Description-of-schemes.html" ;
short bias_to_reference_sst(time, lat, lon) ;
bias_to_reference_sst:long_name = "bias error derived from reference" ;
bias_to_reference_sst:units = "kelvin" ;
bias_to_reference_sst:_FillValue = -32768s ;
bias_to_reference_sst:valid_min = -32767s ;
bias_to_reference_sst:valid_max = 32767s ;
bias_to_reference_sst:add_offset = 0.f ;
bias_to_reference_sst:scale_factor = 0.01f ;
bias_to_reference_sst:comment = "This represent the bias estimate derived from comparison between the
original SST (native SSES being applied) and the reference sensor SST (original SST - reference SST)" ;
short standard_deviation_to_reference_sst(time, lat, lon) ;
standard_deviation_to_reference_sst:long_name = 0b ;
standard_deviation_to_reference_sst:units = "kelvin" ;
standard_deviation_to_reference_sst:_FillValue = -32768s ;
standard_deviation_to_reference_sst:valid_min = -32767s ;
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standard_deviation_to_reference_sst:valid_max = 32767s ;
standard_deviation_to_reference_sst:add_offset = 0.f ;
standard_deviation_to_reference_sst:scale_factor = 0.01f ;
standard_deviation_to_reference_sst:comment = "bias estimate derived using the techniques described at
http://www.ghrsst.org/SSES-Description-of-schemes.html" ;
byte bias_to_reference_sst_confidence(time, lat, lon) ;
bias_to_reference_sst_confidence:long_name = "bias error confidence value" ;
bias_to_reference_sst_confidence:_FillValue = -128b ;
byte satellite_zenith_angle(time, lat, lon) ;
satellite_zenith_angle:long_name = "satellite zenith angle" ;
satellite_zenith_angle:units = "degrees" ;
satellite_zenith_angle:_FillValue = -128b ;
satellite_zenith_angle:valid_min = -90b ;
satellite_zenith_angle:valid_max = 90b ;
satellite_zenith_angle:add_offset = 0.f ;
satellite_zenith_angle:scale_factor = 1.f ;
byte solar_zenith_angle(time, lat, lon) ;
solar_zenith_angle:long_name = "solar zenith angle" ;
solar_zenith_angle:units = "degrees" ;
solar_zenith_angle:_FillValue = -128b ;
solar_zenith_angle:valid_min = -127b ;
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solar_zenith_angle:valid_max = 127b ;
solar_zenith_angle:add_offset = 90.f ;
solar_zenith_angle:scale_factor = 1.f ;
solar_zenith_angle:comment = "This variable provides a pixel by pixel description of where aerosol optical
depth were derived from." ;
short adjusted_sea_surface_temperature(time, lat, lon) ;
adjusted_sea_surface_temperature:long_name = "adjusted sea surface temperature" ;
adjusted_sea_surface_temperature:standard_name =
adjusted_sea_surface_temperature:units = "kelvin" ;
adjusted_sea_surface_temperature:_FillValue = -32768s ;
adjusted_sea_surface_temperature:valid_min = -300s ;
adjusted_sea_surface_temperature:valid_max = 4500s ;
adjusted_sea_surface_temperature:add_offset = 273.15f ;
adjusted_sea_surface_temperature:scale_factor = 0.01f ;
adjusted_sea_surface_temperature:comment = "priorities: exemple : ATS_NR_2P, AVHHRMTA,
NAR17_SST, NAR18_SST, AVHRR17_L, AVHRR18_L, AVHRR17_G, AVHRR18_G, SEVIRI_1H_SST,
GOES_12_1H_SST, AMSRE, TMI, MODIS_A, MODIS_T" ;
adjusted_sea_surface_temperature:reference = "AVHRR_METOP_A" ;
short adjusted_standard_deviation_error(time, lat, lon) ;
adjusted_standard_deviation_error:long_name = "standard deviation error based on L2P SSES and ajustment
method" ;
adjusted_standard_deviation_error:units = "kelvin" ;
adjusted_standard_deviation_error:_FillValue = -32768s ;
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adjusted_standard_deviation_error:valid_min = -32767s ;
adjusted_standard_deviation_error:valid_max = 32767s ;
adjusted_standard_deviation_error:add_offset = 0.f ;
adjusted_standard_deviation_error:scale_factor = 0.01f ;
adjusted_standard_deviation_error:comment = "This represent the cumulated errors of
ajustment method" ;
SSES and
byte wind_speed(time, lat, lon) ;
wind_speed:long_name = "10m wind speed" ;
wind_speed:units = "m.s-1" ;
wind_speed:_FillValue = -128b ;
wind_speed:valid_min = -127b ;
wind_speed:valid_max = 127b ;
wind_speed:add_offset = 0.f ;
wind_speed:scale_factor = 1.f ;
wind_speed:height = "10 m" ;
byte wind_speed_dtime_from_sst(time, lat, lon) ;
wind_speed_dtime_from_sst:long_name = "time difference of the wind speed
measurement" ;
measurement from SST
wind_speed_dtime_from_sst:units = "hour" ;
wind_speed_dtime_from_sst:_FillValue = -128b ;
wind_speed_dtime_from_sst:valid_min = -127b ;
wind_speed_dtime_from_sst:valid_max = 127b ;
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wind_speed_dtime_from_sst:add_offset = 0.f ;
wind_speed_dtime_from_sst:scale_factor = 0.1f ;
wind_speed_dtime_from_sst:comment = "The hours between the wind speed measurement and the SST
observation" ;
byte sources_of_wind_speed(time, lat, lon) ;
sources_of_wind_speed:long_name = "sources of wind speed" ;
sources_of_wind_speed:_FillValue = -128b ;
sources_of_wind_speed:valid_min = 0b ;
sources_of_wind_speed:valid_max = 2b ;
sources_of_wind_speed:flag_meanings = "WSP-ESA-ASCAT-V2 WSP-NCEP-Analysis-V3 WSPECMWF-Forecast-V6" ;
sources_of_wind_speed:comment = "This variable provides a pixel by pixel description of where the wind
speeds were derived from." ;
byte sea_ice_fraction(time, lat, lon) ;
sea_ice_fraction:long_name = "sea_ice_fraction" ;
sea_ice_fraction:units = "" ;
sea_ice_fraction:_FillValue = -128b ;
sea_ice_fraction:valid_min = 0b ;
sea_ice_fraction:valid_max = 100b ;
sea_ice_fraction:add_offset = 0.f ;
sea_ice_fraction:scale_factor = 0.01f ;
byte sea_ice_fraction_dtime_from_sst(time, lat, lon) ;
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sea_ice_fraction_dtime_from_sst:long_name = "time difference of sea ice fraction measurement from SST
measurement"
sea_ice_fraction_dtime_from_sst:units = "hour" ;
sea_ice_fraction_dtime_from_sst:_FillValue = -128b ;
sea_ice_fraction_dtime_from_sst:valid_min = -127b ;
sea_ice_fraction_dtime_from_sst:valid_max = 127b ;
sea_ice_fraction_dtime_from_sst:add_offset = 0.f ;
sea_ice_fraction_dtime_from_sst:scale_factor = 0.1f ;
sea_ice_fraction_dtime_from_sst:comment = "The time difference in hours is estimated from the SST and
sea ice data sets" ;
byte sources_of_sea_ice_fraction(time, lat, lon) ;
sources_of_sea_ice_fraction:long_name = "sources of sea ice fraction" ;
sources_of_sea_ice_fraction:_FillValue = -128b ;
sources_of_sea_ice_fraction:valid_min = 0b ;
sources_of_sea_ice_fraction:valid_max = 1b ;
sources_of_sea_ice_fraction:flag_meanings = "ICE-NSIDC-AMSRE-V3 ICE-ECMWF-Forecast-V3" ;
sources_of_sea_ice_fraction:comment = "This variable provides a pixel by pixel description of where sea ice
fraction were derived from." ;
Table IV.7.1 Variables attributes for CMEMS L3S SST products in netCDF format (ex : product on 10 February 2013)
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NOMENCLATURE OF FILES
The nomenclature of the downloaded files differs on the basis of the chosen download mechanism Subsetter or CMEMS
FTP service.
V.1 Nomenclature of files when downloaded through the CMEMS Web Portal Subsetter
Service
The file nomenclature when downloaded through the CMEMS Web Portal Subsetter is based on product dataset name
and a numerical reference related to the request date on the MIS.
The scheme is: datasetname_nnnnnnnnnnnnn.nc
where:
.datasetname is:
PRODUCTNAME
DATASETNAME
SST_EUR_SST_L3S_NR
T_OBSERVATIONS_010
_009_a
METEOFRANCE-EUR-SST_L3MULTISENSOR_NRT-OBS
SST_EUR_SST_L3C_NR
T_OBSERVATIONS_010
_009_b
METEOFRANCE-EUR-SST_L3MONOSENSOR_NRT-OBS_V2-AVHRR18_G_FULL_TIME_SERIE
AATSR corrector
until 2012
METEOFRANCE-EUR-SST_L3MONOSENSOR_NRT-OBS_V2-AVHRR_METOP_A_FULL_TIME_SERIE
METOP_A corrector
until 09/03/2016
METEOFRANCE-EUR-SST_L3MONOSENSOR_NRT-OBS_V2-AVHRR19_L-EUR-AVHRR_METOP_A_FULL_TIME_SERIE
METEOFRANCE-EUR-SST_L3MONOSENSOR_NRT-OBS_V2-AVHRR_NOAA_19-EUR-AVHRR_METOP_A_FULL_TIME_SERIE
METEOFRANCE-EUR-SST_L3MONOSENSOR_NRT-OBS_V2-MODIS_A-EUR-AVHRR_METOP_A_FULL_TIME_SERIE
METEOFRANCE-EUR-SST_L3MONOSENSOR_NRT-OBS_V2-MODIS_T-EUR-AVHRR_METOP_A_FULL_TIME_SERIE
METEOFRANCE-EUR-SST_L3MONOSENSOR_NRT-OBS_V2-NAR_AVHRR_NOAA_18-EUR-AVHRR_METOP_A_FULL_TIME_SERIE
METEOFRANCE-EUR-SST_L3MONOSENSOR_NRT-OBS_V2-NAR_AVHRR_NOAA_19-EUR-AVHRR_METOP_A_FULL_TIME_SERIE
METEOFRANCE-EUR-SST_L3MONOSENSOR_NRT-OBS_V2-SEVIRI_1_1H_SST-EUR-AVHRR_METOP_A_FULL_TIME_SERIE
METEOFRANCE-EUR-SST_L3MONOSENSOR_NRT-OBS_V2-TMI-EUR-AVHRR_METOP_A_FULL_TIME_SERIE
METEOFRANCE-EUR-SST_L3MONOSENSOR_NRT-OBS_AMSRE-EUR-MYOCEAN_FULL_TIME_SERIE
METEOFRANCE-EUR-SST_L3MONOSENSOR_NRT-OBS_ATS_NR_2P-EUR-MYOCEAN_FULL_TIME_SERIE
METOP_B corrector
METEOFRANCE-EUR-SST_L3MONOSENSOR_NRT-OBS_V2-AVHRR19_L-EUR-AVHRR_METOP_B_FULL_TIME_SERIE
METEOFRANCE-EUR-SST_L3MONOSENSOR_NRT-OBS_V2-AVHRR_METOP_B_FULL_TIME_SERIE
METEOFRANCE-EUR-SST_L3MONOSENSOR_NRT-OBS_V2-MODIS_A-EUR-AVHRR_METOP_B_FULL_TIME_SERIE
METEOFRANCE-EUR-SST_L3MONOSENSOR_NRT-OBS_V2-MODIS_T-EUR-AVHRR_METOP_B_FULL_TIME_SERIE
© EU Copernicus Marine Service – Public
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Ref: CMEMS-OSI-PUM-010-009
Product User Manual for Level 3 SST products
over European Seas
Date
: 8 March 2016
Issue
:1.4
METEOFRANCE-EUR-SST_L3MONOSENSOR_NRT-OBS_V2-SEVIRI_1_1H_SST-EUR-AVHRR_METOP_B_FULL_TIME_SERIE
METEOFRANCE-EUR-SST_L3MONOSENSOR_NRT-OBS_V2-VIIRS_NPP-EUR-AVHRR_METOP_B_FULL_TIME_SERIE
METEOFRANCE-EUR-SST_L3MONOSENSOR_NRT-OBS_V2-AMSR2_NRT-EUR-AVHRR_METOP_B_FULL_TIME_SERIE
. nnnnnnnnnnnnn: 13 digit integer corresponding to the current time (download time) in milliseconds
since January 1, 1981 midnight UTC.
.nc: standard NetCDF filename extension.
Example: METEOFRANCE-EUR-SST_L3MULTISENSOR_NRT-OBS_V2-OSISAF_FULL_TIME_SERIE_1396602704328.nc
V.2 Nomenclature of files when downloaded through the CMEMS Web Portal CMEMS FTP
Service
The scheme is: hhmmss(msms)- datasetname.nc where:
.datasetname for L3C is the character string:
OSISAF-L3C_GHRSST-SSTsubskin-“SENSOR”-EUR-“CORRECTOR”_corrected-MYO-005x005_echeance-v02-fv01.nc
.datasetname for L3S is the character string:
OSISAF-L3C_GHRSST-SSTsubskin-MERGED-EUR-adjusted-MYO-002x002_0024-v02-fv01.nc
.nc: standard NetCDF filename extension.
Example for L3C:
20130209000000-OSISAF-L3C_GHRSST-SSTsubskin-_AVHRR19_L-EUR-AVHRR_METOP_B_corrected-MYO002x002_0024-v02-fv01.nc
20130210000000-OSISAF-L3C_GHRSST-SSTsubskin-SEVIRI_1_1H_SST-EUR-AVHRR_METOP_B_corrected-MYO005x005_0024-v02-fv01.nc
Example for L3S:
20130210000000-OSISAF-L3S_GHRSST-SSTsubskin-MERGED-EUR-adjusted-MYO-002x002_0024-v02-fv01.nc
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