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Dataset Name
The name of the data set archived at CLASS. For ancillary files, starting from the second qualifier, all qualifiers identify the data file to which the ancillary files correspond. The name has the following format: Processing-Center.Data-Type.Spacecraft-Unique-ID.Year-Day.Start-Time.Stop-Time.Processing-Block-ID.Source with each qualifier defined below:
| Qualifier |
Details |
| Processing-Center |
Three characters identifying where the data was created. Recognized character groups are:
N1A = NESDIS 1A - Suitland, Maryland, USA
NAD = NESDIS Ancillary Data - Suitland, Maryland, USA |
| Data-Type |
Four characters identifying the data type and transmission method. Recognized character groups are:
AIPX= AIP 1A Telemetry file derived from AIP
AIPS= AIP 1A Telemetry file derived from stored AIP
HRPT= HRPT (direct readout full resolution AVHRR)
GHRR= GAC (recorded reduced resolution AVHRR)
LHRR= LAC (recorded HRPT AVHRR) |
| Spacecraft-Unique-ID |
NK = NOAA-15 (NOAA-K)
NL = NOAA-16 (NOAA-L)
NM = NOAA-17 (NOAA-M)
NN = NOAA-18 (NOAA-N) |
| Year-Day |
e.g. D05150, where "D" identifies this group as a Julian day delimiter, "05" identifies the year in which the spacecraft began recording the data and "150" identifies the Julian day on which the spacecraft began recording the data. |
| Start-Time |
e.g. S1355, where "S" identifies this group as a start time delimiter. "1355" denotes 13 hours 55 minutes UTC (to the nearest minute) and represents the time at which spacecraft recording began. |
| Stop-Time |
e.g. E1456, where "E" identifies this group as an end time delimiter. "1456" denotes 14 hours 56 minutes UTC (to the nearest minute) and denotes the time of spacecraft recording of the last usable data in the data set. |
| Processing-Block-ID |
e.g. B0016465, where "B" identifies this group as a processing block ID delimiter. "0016465" is a seven digit number identifying the spacecraft revolution (orbit) in which recording of this data set began and the revolution in which the recording of the data set ended (the first five digits identifying the beginning revolution and the last two being the two least significant digits of the ending revolution). |
| Source |
Two characters identifying data acquisition source. Valid character groups are:
DU = Dundee, Scotland, UK
GC = Fairbanks, Alaska, USA (formerly Gilmore Creek)
HO = Honolulu, Hawaii, USA
MO = Monterey, California, USA
SO = Satellite Operations Control Center, Suitland, Maryland, USA
WE = Western Europe, Lannion, France
WI = Wallops Island, Virginia, USA |
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Datatype
The data types available for IJPS Companion Files are:
| Datatype Name Code |
Description |
| IJPS_AIP |
NOAA AIP1A telemetry files |
| IJPS_ANC |
IJPS ancillary files |
| AUXI_PSCX |
PSCEARS Initialization Report |
| AUXI_CLKD |
NOAA clock drift files |
| AUXI_CPID |
NOAA Calibration Parameter Database Files |
| AUXI_ONFX |
Orbit number files |
| AUXI_EQXX |
Equator crossing files |
| AUXI_OSV2 |
NOAA two line elements |
| AUXI_OSV4 |
NOAA four line elements |
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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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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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Inventory ID
A unique numerical ID assigned to the data set for CLASS inventory purposes.
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Node
Not applicable for IJPS Companion Files.
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Processing Mode
Not applicable for IJPS Companion Files
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Resolution
Not applicable for IJPS Companion Files
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Satellite
The satellite that acquired the AVHRR data.
| N15 |
NK |
NOAA-15 |
| N16 |
NL |
NOAA-16 |
| N17 |
NM |
NOAA-17 |
| N18 |
NN |
NOAA-18 |
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Size
The size in bytes of the file to be delivered to the user.
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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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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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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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