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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 Name
The name of the data set archived at CLASS. 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:
NSS = NOAA/NESDIS - Suitland, Maryland,
USANPR = NESDIS Product - Suitland, Maryland, USA |
| Data-Type |
Four characters identifying the data type and transmission method. Recognized character groups are:
SDRR= SSM/I SDR (Special Sensor Microwave/Imager Sensor Data Records)
TDRR= SSM/I TDR (Special Sensor Microwave/Imager Temperature Data Records)
EDRR= SSM/I EDR (Special Sensor Microwave/Imager Environmental Data Records)
SSMT= SSM/T-1 (Special Sensor Microwave Temperature Sounder)
SMT2= SSM/T-2 (Special Sensor Microwave Water Vapor Profiler) |
| Spacecraft-Unique_ID |
S4 = F10 (Air Force F10)
S5 = F11 (Air Force F11)
S6 = F12 (Air Force F12)
S7 = F13 (Air Force F13)
S8 = F14 (Air Force F14)
S9 = F15 (Air Force F15)
SA = F16 (Air Force F16)
SB = F17 (Air Force F17)
SC = F18 (Air Force F18) |
| Year-Day |
e.g. D79104, where "D" identifies this group as a Julian day delimiter, "79" identifies the year in which the spacecraft began recording the data set and "104" identifies the Julian day on which the spacecraft began recording the data set. |
| 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 |
Fixed field with value NS designating that there was No Station. |
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Datatype
The data types available for DMSP are:
- Environmental Data Records (EDR) - Environmental data records of geophysical parameters derived from the Special Sensor Microwave/Imager.
- Sensor Data Records (SDR) - Sensor data records of brightness temperatures derived from the Special Sensor Microwave/Imager.
- Temperature Data Records (TDR) - Temperature data records of antenna temperatures derived from the Special Sensor Microwave/Imager.
- SSM/T-1 Level 1B - Temperature sounder data derived from the Special Sensor Microwave Temperature (SSM/T-1) sounder and processed into level 1B format by NOAA/NESDIS/IPD.
- SSM/T-2 Level 1B - Humidity sounder data derived from the Special Sensor Microwave Vapor Profiler (SSM/T-2) and processed into level 1B format by NOAA/NESDIS/IPD.
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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
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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Orbit
The number of the orbit (revolution) in which the satellite was traveling when the data was acquired.
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Quality
Flags indicating data quality.
| Character Position |
Meaning |
| 1 |
G = gaps were present in the data set
N = no gaps were found
X = data set was not verified for gaps |
| 2 |
B = both the start and end times were adjusted
S = start time was adjusted
E = end time was adjusted
N = neither time was adjusted
X = data set was not verified for times |
| 3 |
Reserved for future use |
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Receiving Station
Fixed field with value NS designating that there was No Station.
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Satellite
The satellite that acquired the DMSP data.
| Air Force Sattelite ID |
Dataset Name Spacecraft-Unique-ID |
Satellite |
| F10 |
S4 |
Air Force F10 |
| F11 |
S5 |
Air Force F11 |
| F12 |
S6 |
Air Force F12 |
| F13 |
S7 |
Air Force F13 |
| F14 |
S8 |
Air Force F14 |
| F15 |
S9 |
Air Force F15 |
| F16 |
SA |
Air Force F16 |
| F17 |
SB |
Air Force F17 |
| F18 |
SC |
Air Force F18 |
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Size
The size of the file to be delivered to the user in bytes.
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Spatial
Allows users to search for data from a specific region on the map.
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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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