Global Navigation Satellite System Receiver for Atmospheric Sounding Level 1B - GRAS

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 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:  GRAS_xxx_1C_M02_20070101101500Z_20070101115500Z_N_O_20070101121500Z__20070101121500 Where: INSTRUMENT_ID  - 4 characters defining the instrument (ASCT, 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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Datatype

The datatype available is GRAS

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End Orbit

The number of the orbit (revolution) in which the satellite was traveling at the end of the coverage of the given dataset.

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End Time

The UTC date and time corresponding to the end of the coverage of the given dataset. Format is yyyy-mm-dd hh:mm:ss.fff where fff is the fraction of a second in milliseconds.

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Inventory ID

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

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Node

N/A

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Processing Mode

Backlog
Nominal
Reprocessing
Validation

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Receiving Station

The ground station to which data was transmitted for the given data set.

Fairbanks, AK
ReferenceUser Station
SOCC
Svalbard
Wallops Island VA

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Resolution

N/A

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Satellite

EUMETSAT

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Size

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

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Start Orbit

The number of the orbit (revolution) in which the satellite was traveling at the beginning of the coverage of the given dataset.

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Start Time

The UTC date and time corresponding to the beginning of the coverage of the given dataset. Format is yyyy-mm-dd hh:mm:ss.fff where fff is the fraction of a second in milliseconds.

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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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