GOES Satellite Data GVAR_IMG (Imager)

Bands

Synonymous with channel number. The channel number, or band, of the instrument that acquired the data. Channel numbers are associated with different wavelengths or ranges of wavelengths within the electromagnetic spectrum, e.g. on GOES, channel 1 is 3900 nm

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Bits/Pixel

User option for the data delivery format. Indicates the number of bits to be used to represent each sensor pixel value in the delivery file. Choosing 8 or 16-bits/pixel results in the unpacking of the sensor data and the placing of each pixel value into the indicated number of bits. Note that the sensor data originates in a packed format with each pixel value occupying 10 bits. If 8 is chosen, the original 10-bit raw data is reduced to 8 bits/pixel. If 16 is chosen, the original 10 bits are preserved and are packed into a 16-bit word.

User interface note: Users can specify bits/pixel in the formatting of their extracted data. Selections 8 and 16 are for unpacked extraction and allow users to subsequently specify which channels they wish to receive. If users specify raw data, they will receive all channels in the original 10-bits/pixel format.

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Channel Number

The channel number, or band, of the instrument that acquired the data. Channel numbers are associated with different wavelengths or ranges of wavelengths within the electromagnetic spectrum, e.g. on GOES, channel 1 is 3900 nm.

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Coverage

Indicates the geographic area of the dataset. Note that coverage does not apply to B11 data.

Listed below are the definitions of the abbreviated coverage names. I indicates the coverage name is applicable to Imager data. S indicates applicability to Sounder data.

CONUS IS

 Continental United States
PACUS I Pacific United States
NH I Northern Hemisphere
SH I Southern Hemisphere
FD I Full Disk
O I Other
SHORT FD I Short Full Disk
PAC9 I 9.5 Minute Sector
PAC7 I 15 Minute Full Disk
NH E I Northern Hemisphere Extended
SH SS I Southern Hemisphere Small Sect
SRSO MD I Super Rapid Scan Over Maryland
SRSO HAW I Super Rapid Scan Over Hawaii
SUB CONUS I Sub Continental United States
ABBR NORTH S Abbreviated North
EAST CARIB S East Caribbean
GULF OF MX S Gulf of Mexico
LIM-GLF-MX S Limited Gulf of Mexico
NORTH ATL S Northern Atlantic
HAWAII S Hawaii
NORTH PAC S Northern Pacific
LIM-N-PAC S Limited Northern Pacific
NORTH S North Sounding
SOUTH S South Sounding
CENTRAL S Central Sounding

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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 Max Latitude

The latitude of the northernmost pixel of the dataset.

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Dataset Max Longitude

The longitude of the westernmost pixel of the dataset.

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Dataset Min Latitude

The latitude of the southernmost pixel of the dataset.

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Dataset Min Longitude

The longitude of the easternmost pixel of the dataset.

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Dataset Name

The name of the Level 1B data set archived at CLASS. The name has the following format: <Satellite ID>.<Year>.<Julian Day>.<Start Time>

e.g. goes12.2004.148.110923

Qualifier
 Details
Satellite ID goes08
goes09
goes10
goes12
Year e.g. 2004, denotes the 4 digit year
Julian Day e.g. 148, denotes the 3 digit day of the year from 001 to 366
Start Time e.g. 110923, where "11" identifies the hour, "09" the minute, and "23" the second the dataset acquisition began

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Dataset Size

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 GVAR data.

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Easternmost Element

The element number of the easternmost pixel of the dataset. Elements are the index for the horizontal x-axis of a scan.

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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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Geographic Subset

Checking the subset flag means that, if users perform a non-global spatial search, they will receive only those scans which intersect the geographic region they defined for that search. Users should note that they will receive a scan in its entirety even if only a portion of that scan lies within their search region.

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Ingest Status

The state of the dataset's ingestion process.
Possible values are:

  • Complete_A: Ingest has completed successfully and the data is of high quality.
  • Incomplete: The ingest process is not yet finished.

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Ingest Time

The UTC date and time that the dataset was ingested. Format is yyyy-mm-dd hh:mm:ss

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Inventory ID

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

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Map Overlay

The order option that allows a map of political borders to be drawn on images generated from a dataset.

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Northernmost Scanline

The line number of the northernmost pixel in the dataset. Lines are the index for the vertical axis of a scan.

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Output Format

User option for the format of the output file. Note that Block 11 data is only available in the raw format.

The valid formats are:

  • NetCDF - Network Common Data Format
  • JPG - image file
  • GIF - image file
  • AREA - McIDAS data format
  • RAW - Native GVAR format

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Satellite

Abbreviation that identifies the satellite that acquired the dataset.

Listed below are the definitions of the abbreviated satellite IDs:

G08 GOES-08
G09 GOES-09
G10 GOES-10
G12 GOES-12

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Satellite Schedule

The schedule, or mode of operation, that the satellite was in when it collected the data contained within the given dataset.

Listed below are the definitions of the abbreviated schedule codes:

R, ROUTIN Routine
RSO Rapid Scan Operation
SRSO Super Rapid Scan Operation
SPEC, SPECIA, O Checkout or other special short-term operations

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Southernmost Scanline

The line number of the southernmost scanline in the dataset. Lines are the index for the vertical axis of a scan.

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Spatial Resolution

The spatial resolution of the dataset, often specified in kilometers (km) and measured at instrument nadir (point directly below the satellite). VIS spatial resolution refers to the spatial resolution of the visible channels, IR spatial resolution refers to that of the infrared channels.

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Spatial

Refers to the geographic area of interest to the user. This section of the search page allows the user to define the geographic area of interest.

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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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Subpoint Latitude

The latitude of the point on Earth that is directly below the satellite.

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Subpoint Longitude

The longitude of the point on Earth that is directly below the satellite.

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Subset Flag

The order preference field that specifies that a line item is to be a geographic subset of the original dataset. When this flag is checked, the user is requesting that the output dataset include a subset of all scans which intersect the user's spatial area specified at the time of their search. Unchecking this option results in a request for the full 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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Westernmost Element

The element number of the westernmost pixel of the dataset. Elements are the index for the horizontal x-axis of a scan.

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