The document discusses future satellite services from the Copernicus Sentinel-3 mission. Sentinel-3 will carry several instruments to measure sea and land surface temperature, sea surface topography, ocean and land color, and more. It will generate various data products at different processing levels with different spatial resolutions, swath widths, and timeliness from near-real time to non-time critical. The products will be disseminated through EUMETCast and an online archive and will be made gradually available to Copernicus services and scientific users during the commissioning and ramp-up phase after the launch of Sentinel-3A.

1. EUMETCast User Forum:
Future Satellite Services
François Montagner

2. Future Satellite Services
• Copernicus Sentinel-3 Products Overview
• Copernicus Sentinel-3 Products Dissemination
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3. Sentinel-3 Satellite and Payload
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• SLSTR: Sea and Land Surface
Temperature Radiometer
• SRAL: Synthetic Aperture Radar Altimeter
• OLCI: Ocean and Land Colour Instrument
• MWR: Micro-Wave Radiometer
• LRR: Laser Retro-Reflector
• DORIS: Doppler Orbitography and
Radiopositionning Integrated by Satellite
• STM: Surface Topography Mission = SRAL
+ MWR

4. Sentinel-3 Marine product contents
Level 1B: SLTSR (radiance, BT at TOA) and OLCI (radiance at TOA) and
Level 2 OLCI:
• Normalised water surface reflectance
• Algal pigment concentration for open and
for coastal waters
• Total suspended matter concentration
• Diffuse attenuation coefficient
• Coloured dissolved matter absorption
• Photosynthetically active radiation
• Integrated water vapour
• Aerosol optical depth
• Aerosol Angström exponent
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Level 2 SLTSR:
• Sea surface temperature
(L2P GHRSST standard)
Level 2 SRAL:
• Sea/coastal zone surface height
• Significant wave height
• Wind speed
• Backscatter coefficient s0
• Sea ice height, freeboard
• Total water, liquid water (from MWR)
SRAL(waveforms)
(ESA and EUMETSAT)

5. Sentinel-3 Land / Sea masks (1/2)
Land/sea masks apply to Level 2 products only. Level 1 products make no
distinction, and provide the mask as annotation data.
Optical products (OLCI, SLSTR, Synergy): land and water masks are fully complementary
OLCI Level 2 Products: The Land and Water split
and do not overlap. Major lakes are flagged as “sea”.
Examples extracted by a simulation of 3 minutes frame for OLCI Level 2 Full Resolution products
Land OL_2_LFR Marine OL_2_WFR
Water is masked in blue, no values
are provided for these pixels.
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Land is masked in grey, no values are
provided for these pixels
Example of geophysical product:
OLCI Terrestrial Chlorophyll Index (OTCI)
Example of geophysical product:
Chlorophyll Concentration for open ocean waters (CHL_OC4ME)
The Land and Water masks are
perfectly complementary.
The cloud mask is also provided in white for a better
interpretation of the information.

6. Sentinel-3 Land / Sea masks (2/2)
Altimetry products (SRAL): masks do overlap inside and outside the coastline.
SRAL Level 2 Marine and Land Products are split according to the figure below
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SRAL Subsatellite Track
SRAL Level 2 Marine Products will contain
information sensed over the white area (Open
Ocean and Sea-Ice) and the green area (Coastal
zones and part of the land within a certain
distance from the coastline)
SRAL Level 2 Land Products will contain
information sensed over the black area (Land)
and the green area (Coastal zones and part of
the land within a certain distance from the
coastline)
Coastal Area (up to 300km from the
coastline) and part of the Land (few
km from the coastline)
Land Area: including
rivers and Lakes
Open Ocean
Both Products will contain the measurements over the coastal areas
(up to 300 Km offshore) and part of the Land within a few km from the
coastline

7. Sentinel-3 Marine optical product characteristics
Product Spatial res.
Product resolution, swath width and accuracy are the required values as per e.g. “Sentinel-3 ESA’s Global Land and Ocean Mission for
GMES Operational Services”, ESA SP-1322/3
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(m)
Swath width
(km)
Accuracy Size +
(GB/rev)
OLCI L1 EFR 300 1270 TOAR: 2% 21.47
OLCI L1 ERR 1200 Idem Idem 1.76
OLCI L2 WFR 300 Idem Reflectance: 5%@400nm
Algal pigment: 30%
(ocean)
14.19
OLCI L2 WRR 1200 Idem Idem 1.19
SLSTR L1B 500 (vis/NIR),
1000 (TIR)
740 (dual view)
1400 (nadir)
<5% (vis/NIR TOAR)
0.2K (TIR BT)
18.56
SLSTR L2 WST 1000 740 0.3K 0.74
+ based on estimated compression factor

8. Sentinel-3 Marine altimetry product characteristics
Product Sampling Accuracy Size
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(GB/rev)
SRAL L1B Waveform rate : 20 Hz 0.75
SRAL L2 WAT Reduced (or LRM) : 1 Hz
Standard : 1 Hz, 20 Hz
Extended: 20 Hz +
waveforms
SSH: 10 cm (NRT), 3.5cm (STC)
SWH: 4% (NRT), 1% (STC)
Wind: 2 m.s-1 (NRT), 1.5m.s-1 (STC)
0.20
Product resolution, swath width and accuracy are the required values as per e.g. “Sentinel-3 ESA’s Global Land and Ocean Mission for
GMES Operational Services”, ESA SP-1322/3

9. Sentinel-3 Product Formats
• The Sentinel-3 Products are organised in packages, using a
restriction of the CCSDS XML Formatted Data Unit (XFDU)
specific for the Sentinel-3 mission.
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XML
format
NetCDF-4
format

10. Sentinel-3 Products Timeliness
NRT products
STC products
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NTC products
NTC products
Reprocessing Campaign
NRT: Near Real time
STC: Short Time Critical
NTC: Non time Critical
Weather and ocean forecasting,
sea state forecasting
Operational ocean
monitoring and forecasting
Climate monitoring
Oceanography
time
3 h 48 h 30 d ~1/2 y
Climatology
Data exploitation for
science

11. Sentinel-3 Marine PDGS context
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Terrestrial EUMETCast
considered in addition
Product
Dissemination
Units (PDUs)
apply to both
EUMETCast and
ODA/ORA
dissemination
Online Rolling Data Archive
(ODA/ORA): Supports
ftp/http access to level 1&2
PDUs over the Internet

12. Sentinel-3 Marine Product Dissemination Baseline (1/2)
Product EUMET-Cast
ODA/ORA Data
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Centre
Timeliness Resol. Rate
(Mbps)*
OLCI L1 EFR    NRT full 29.02
OLCI L1 EFR   NTC full
OLCI L1 ERR    NRT red. 2.38
OLCI L1 ERR   NTC red.
OLCI L2 WFR   NRT, NTC full
OLCI L2 WRR    NRT red. 1.60
OLCI L2 WRR   NTC red.
SLSTR L1B   NRT, NTC full
SLSTR L2 WST    NRT full 1.00
SLSTR L2 WST   NTC full
* EUMETCast only

13. Sentinel-3 Marine Product Dissemination Baseline (2/2)
Product EUMETCast ODA/ORA Data
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Centre
Timeliness Resol. Rate
(Mbps)*
SRAL L1A+   STC, NTC full
SRAL L1B    NRT, STC full 1.01 + 1.01
SRAL L1B   NTC full
SRAL L1BS+   STC, NTC full
SRAL L2 WAT    NRT, STC full 0.83 + 0.83
SRAL L2 WAT   NTC full
* EUMETCast only
+ Day 2 evolution

14. Sentinel-3 Services Ramp-up Schedule
Similarly, data access is
gradually open to all
users from early stages
of mission
S-3A commissioning phase:
Launch + 5 months
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S-3A spacecraft
commissioning S-3A ramp-up: operational qualification
Milestone 1: Spacecraft
IOCR (S-3A Launch + 5
months)
Milestone 2: PDGS
commissioning review (S-3A
Launch + TBD months)
S-3A routine
operations
Milestone 3: routine
operations review
Data provision mainly to
Sentinel-3 calibration validation
team as and when ready. Test
technical interfaces for data
provision to Copernicus core
services.
Start gradual data provision to
Copernicus core services and
collaborative ground segment
(national mirror sites).
Full data provision to
Copernicus core services and
collaborative ground segment
(national mirror sites). Gradual
data provision to scientific and
other users.
Full data provision to all
users.
S-3A
launch
M1: S-3A
IOCR
M2: S-3A
Commissioning review
M3: S-3A
Routine ops review
Subsets of L0, L1, L2 to
S-3 cal & val team
Official release of
Level 1
User data products are
gradually qualified and
operationally certified