Minimize Data Formats

The OLCI data format follows the format defined for each Sentinel-3 product in the PDGS product specification and is based on SENTINEL-SAFE.

SENTINEL-SAFE is based on the XML Formatted Data Units (XFDU) developed by the Consultative Committee for Space Data Systems (CCSDS). SENTINEL-SAFE is a profile of XFDU, and it restricts the XFDU specifications for specific utilisation in the EO domain, providing semantics in the same domain to improve interoperability between ground segment facilities.

XFDU Package Schema

Figure 2: XFDU package schema

 

Each product package includes:

  • a manifest file containing a metadata section and a data object section
  • measurement data files
  • annotation data files, if defined
  • for Level-0 only, representation data files (XML files describing the binary information).

Sentinel-3 user products are disseminated in Product Dissemination Units (PDU), in order to ease the online dissemination and data handling for the users. The PDU is a portion of data and is defined per product type.

 

Table 5: Description and content of the OLCI product package. The estimated size corresponds to a half orbit without consideration about compression, with NRT/NTC less than 3/48 hours after measurement by satellite

Level Name of
Product Package
Main Content Use Latency Estimated
Size per half Orbit
Product Dissemination Unit
(PDU)

0

OL_0_EFR

Full Resolution ISPs

INTERNAL

NRT

9.5GB

N/A

OL_0_CR0

Calibration with no spectral relaxation

502Mb

OL_0_CR1

Calibration with spectral relaxation

240Mb

1

OL_1_EFR

Full Resolution TOA Reflectance

USER

NRT/NTC

28.5GB

Frame 3 mn

OL_1_ERR

Reduced Resolution TOA Reflectance

2.3GB

Dump (full daylight orbit)

OL_1_RAC

Dark offset and gain coefficients from radiometric calibration

INTERNAL

NRT

1Mb

N/A

OL_1_SPC

Wavelength characterization from spectral calibration

27Mb

2

OL_2_WFR

Full Resolution Water and Atmosphere geophysical products

USER

NRT/NTC

28.4GB

Frame 3 mn

OL_2_LFR

Full Resolution Land and atmosphere geophysical products

8.8GB

OL_2_WRR

Reduced Resolution Water and Atmosphere geophysical products

2.4GB

Dump (full daylight orbit)

  • EFR         Earth Observation Reduced Resolution
  • ERR         Earth Observation Reduced Resolution
  • RAC         Radiometric Calibration
  • SPC         Spectral Calibration
  • WFR        Water Full Resolution
  • LFR         Land Full Resolution
  • WRR        Water Reduced Resolution
  • LRR         Land Reduced Resolution