Indian Ocean Data Coverage

The Indian Ocean Data Coverage (IODC) service — provides level 1.5 image data, meteorological products and a data collection and retransmission service.

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OVERVIEW

Meteosat-8 delivers the operational Indian Ocean Data Coverage Service from its position at 41.5 °E.

The IODC service is similar to the 0 degree service, but without Low Rate SEVIRI. It includes:

  • Image data
  • All Level 2 meteorological products
  • DCPs
  • Search and rescue

All full list of products can be found in our Product Navigator.

Data Access

The IODC data can be accessed in near real-time via the EUMETCast Satellite and EUMETCast Terrestrial Demonstration services. A sub-set of products are available via Global Telecommunications System (GTS). The full archive of data and products can be downloaded via the Data Centre.

The EUMETCast Satellite distribution is on the following channels:

  • For the image data: E1B-GEO-1 (PID: 500, Multicast address: 224.223.222.27)
  • For the Meteorological products: E1B-GEO-2 (PID: 500, Multicast address: 224.223.222.27)

EUMETCast example filenames:
H-000-MSG1__-MSG1_IODC____-HRV______-000005___-201605091215-C_
L-000-MSG1__-MPEF_IODC____-GII______-PRO______-201605091200-__

See the following document for the Meteosat-8 Bulletin headers.

Access to near real-time and offline data and products typically involves an initial registration process. For further information, please visit our Data Registration page, or register on the Earth Observation Portal (EOP).

Spectral Channels

High Rate SEVIRI image data consist of geographical arrays of various sizes of image pixels, each pixel containing 10 data bits, representing the received radiation from the earth and its atmosphere in the 12 spectral channels. Of these 12 spectral channels, 11 provide measurements with a resolution of 3 km at the sub-satellite point with the 12th, the High Resolution Visible (HRV) channel, providing measurements with a resolution of 1 km.

Scan Modes

The HRV channel supports a mode of operation known as Alternative HRV Scanning Mode Operations. In this mode it is possible to introduce a horizontal split into the HRV image, and separately specify the E-W offset of the HRV image window above and below the split.

HRV Scan Pattern

From DOY 079 to 264 (included), the HRV configuration with a split window is in a seasonal 'summer illumination configuration', as follows:

  • Between 22:00 UTC (previous day) and 15:00 UTC, the upper HRV window is at its nominal position centred on Central Asia region.
  • At 15:00 UTC the upper window is shifted west to monitor more European illuminated areas.
  • At 22:00 UTC the upper HRV window is shifted back east to the normal position.

For the rest of the year, the HRV configuration with a split window is in a seasonal 'winter illumination configuration', as follows:

  • Between 22:00 UTC (previous day) and 14:00 UTC, the upper HRV window is at its nominal position centred on Central Asia region.
  • At 14:00 UTC the upper window is shifted west to monitor more European illuminated areas.
  • At 22:00 UTC the upper HRV window is shifted back east to the normal position.

Quality Indicators

High Rate SEVIRI Image Product contains numerous image quality indicators. These indicators provide information on the completeness, geometric quality, radiometric quality, and timeliness of the Level 1.5 product, as well as information on the quality and completeness of the Level 1.0 Image from which the Level 1.5 Image Product was derived. See MSG Level 1.5 Image Product - Quality Indicators (PDF, 365 KB).

 

History of IODC

IODC was originally established to support INDOEX by providing Meteosat-5 imagery for the Indian Ocean area, for the duration of this experiment. The operational service from this position started on 1 July 1998, at the request of Member States and other users in the Indian Ocean region.

INDOEX was an international field experiment with participation from United Kingdom, France, Germany, India, the Netherlands, Sweden, and the USA.

The three main objectives were to:

  1. Assess the significance of aerosols for global radiative forcing.
  2. Assess the magnitude of the solar absorption at the surface and in the troposphere including the ITCZ cloud systems.
  3. Assess the role of the ITCZ in the transport of trace species and pollutants and their resultant, radiative forcing.

Meteosat-5 provided the service at 63 °E from 01/07/1998–16/04/2007 and Meteosat-7 provided the service at 57 °E from 05/12/2006–31/03/2017 (in parallel).

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