Infrared Atmospheric Sounding Interferometer IASI3X3

Data Usage Guidance/Restrictions

The operational data for this datatype is available to all registered CLASS users. Pre-operational data may be restricted to authorized users. To become an authorized user, send a request to the CLASS Help Desk.

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Dataset Name

The dataset names for all 4 EUMETSAT instruments follows the same basic format.

<INSTRUMENT_ID>_<PRODUCT_TYPE>_<PROCESSING_LEVEL>_<SPACECRAFT_ID>_
<SENSING_START>_<SENSING_END>__<PROCESSING_MODE>_<DISPOSITION_MODE>_
<PROCESSING_ TIME>__<SOME_DATE>

Example)  IASI_xxx_1C_M02_20070101101500Z_20070101115500Z_N_O_20070101121500Z__20070101121500
Where:
INSTRUMENT_ID  - 4 characters defining the instrument (ASCA, GOME, GRAS, IASI)
PRODUCT_TYPE  - 3 characters defining the type of product (For ASCAT this indicates the resolution - SZF
(full), SZR (research - 25KM), SZO (operational 50 KM);    for all other instruments: xxx (literally 3 lower
case x's)  )
PROCESSING_LEVEL - 2 characters (1B for ASCAT, GOME, GRAS;  1C for IASI)
SPACECRAFT_IUD - 3 characters   (M02, eventually also M01)
SENSING_START UTC - 15 characters - 14 for the date, one for the "Z" at the end - (YYYYMMDDHHMMSSZ)
SENSING_END UTC- 15  characters - 14 for the date, one for the "Z" at the end  (YYYYMMDDHHMMSSZ)
PROCESSING_MODE -  1 character   (N (nominal), B (backlog), R (reprocessing),  V (verification) )
DISPOSITION_MODE  -1 characters  (T (testing), O (operational), C (commissioning) )
PROCESSING_TIME UTC 15 characters - 14 for the date, one for the "Z" at the end  (YYYYMMDDHHMMSSZ)
SOME_DATE -14 characters (No Z at the end)   (YYYYMMDDHHMMSS)
Total length - 67 defined in documentation + 16 (2 underscores plus some date) = 83 characters

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Dataset Size (Bytes)

The size in bytes of the file to be delivered to the user.

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Data Source

Code internal to CLASS for the source of IASI3X3 data.

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Datatype

Need this information.

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Inventory ID

A unique numerical ID assigned to the dataset for CLASS inventory purposes.

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Node

The ascending node refers to that portion of the orbit during which the satellite is heading northward. Descending refers to the southbound portion.

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Satellite

EUMETSAT

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Temporal

Refers to the time span of interest to the user. This section of the search page allows the user to define the range of dates/times of interest.

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UTC

Coordinated Universal Time (UTC) is the international time standard. It is the current term for what was referred to as Greenwich Meridian Time (GMT). Zero (0) hours UTC is midnight in Greenwich England, which lies on the zero longitudinal meridian. Universal time is based on a 24 hour clock, therefore, afternoon hours such as 4 pm UTC are expressed as 16:00 UTC (sixteen hours, zero minutes).

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