N: 90 S: -90 E: 180 W: -180
Description
SST4 provides sea surface temperature retrieved from the mid-wave IR bands near 4 µm (∼3.7–4.1 µm). These channels are typically used at night (to avoid solar contamination) and can offer reduced sensitivity to atmospheric water vapor compared with long-wave (11/12 µm) split-window SST, making SST4 a valuable complement in humid or tropical conditions.
Geophysical variables in this suite include:
• bias_sst4 — 4 µm Sea Surface Temperature bias (°C)
• flags_sst4 — Product-specific flags, 4 µm Sea Surface Temperature (integer bitmask)
• l2_flags — Level-2 Processing Flags (integer bitmask; see bit definitions)
• qual_sst4 — Quality levels for 4 µm Sea Surface Temperature (integer quality flag)
• sst4 — 4 µm Sea Surface Temperature (°C)
• sstref — Sea Surface Temperature reference (°C)
• stdv_sst4 — 4 µm Sea Surface Temperature standard deviatio (°C
Product Summary
Documents
ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)
Variables
The table below lists the variables contained within a single granule for this dataset. Variables often contain observed or derived geophysical measurements collected from a variety of sources, including remote sensing instruments on satellite and airborne platforms, field campaigns, in situ measurements, and model outputs. The terms variable, parameter, scientific data set, layer, and band have been used across NASA’s Earth science disciplines; however, variable is the designated nomenclature in NASA’s Common Metadata Repository (CMR). Variable metadata attributes such as Name, Description, Units, Data Type, Fill Value, Valid Range, and Scale Factor allow users to efficiently process and analyze the data. The full range of attributes may not be applicable to all variables. Additional information on variable attributes is typically available in the data, user guide, and/or other product documentation.
For questions on a specific variable, please use the Earthdata Forum.
| Name Sort descending | Description | Units | Data Type | Fill Value | Valid Range | Scale Factor | Offset |
|---|---|---|---|---|---|---|---|
| geophysical_data/bias_sst4 | geophysical_data/bias_sst4 | degree_C | int16 | -32767 | -10000 to 10000 | 0.0049999998882413 | 0 |
| geophysical_data/flags_sst4 | geophysical_data/flags_sst4 | N/A | int16 | -32767 | -32767 to 32767 | N/A | N/A |
| geophysical_data/l2_flags | geophysical_data/l2_flags | N/A | int32 | N/A | -2147483648 to 2147483647 | N/A | N/A |
| geophysical_data/qual_sst4 | geophysical_data/qual_sst4 | N/A | int8 | -1 | 0 to 5 | N/A | N/A |
| geophysical_data/sst4 | geophysical_data/sst4 | degree_C | int16 | -32767 | -1000 to 10000 | 0.0049999998882413 | 0 |
| geophysical_data/sstref | geophysical_data/sstref | degree_C | int16 | -32767 | -600 to 9000 | 0.0049999998882413 | 0 |
| geophysical_data/stdv_sst4 | geophysical_data/stdv_sst4 | degree_C | int16 | -32767 | -10000 to 10000 | 0.0049999998882413 | 0 |
| navigation_data/cntl_pt_cols | navigation_data/cntl_pt_cols | N/A | int32 | -32767 | 0 to 10000 | N/A | N/A |
| navigation_data/cntl_pt_rows | navigation_data/cntl_pt_rows | N/A | int32 | -32767 | 0 to 10000 | N/A | N/A |
| navigation_data/latitude | navigation_data/latitude | degrees_north | float32 | -999 | -90 to 90 | N/A | N/A |
| navigation_data/longitude | navigation_data/longitude | degrees_east | float32 | -999 | -180 to 180 | N/A | N/A |
| navigation_data/tilt | navigation_data/tilt | degree | float32 | -32767 | -25 to 25 | N/A | N/A |
| scan_line_attributes/clat | scan_line_attributes/clat | degrees_north | float32 | -999 | -90 to 90 | N/A | N/A |
| scan_line_attributes/clon | scan_line_attributes/clon | degrees_east | float32 | -999 | -180 to 180 | N/A | N/A |
| scan_line_attributes/csol_z | scan_line_attributes/csol_z | degree | float32 | -999 | -90 to 90 | N/A | N/A |
| scan_line_attributes/day | scan_line_attributes/day | days | int32 | -32767 | 0 to 366 | N/A | N/A |
| scan_line_attributes/detnum | scan_line_attributes/detnum | N/A | int8 | -1 | 0 to 25 | N/A | N/A |
| scan_line_attributes/elat | scan_line_attributes/elat | degrees_north | float32 | -999 | -90 to 90 | N/A | N/A |
| scan_line_attributes/elon | scan_line_attributes/elon | degrees_east | float32 | -999 | -180 to 180 | N/A | N/A |
| scan_line_attributes/msec | scan_line_attributes/msec | milliseconds | int32 | -32767 | 0 to 86400000 | N/A | N/A |
| scan_line_attributes/mside | scan_line_attributes/mside | N/A | int8 | -1 | 0 to 1 | N/A | N/A |
| scan_line_attributes/slat | scan_line_attributes/slat | degrees_north | float32 | -999 | -90 to 90 | N/A | N/A |
| scan_line_attributes/slon | scan_line_attributes/slon | degrees_east | float32 | -999 | -180 to 180 | N/A | N/A |
| scan_line_attributes/year | scan_line_attributes/year | years | int32 | -32767 | 1900 to 2100 | N/A | N/A |
| sensor_band_parameters/aw | sensor_band_parameters/aw | m^-1 | float32 | -32767 | 9.9999997473788E-5 to 5 | N/A | N/A |
| sensor_band_parameters/bbw | sensor_band_parameters/bbw | m^-1 | float32 | -32767 | 4.9999998736894E-6 to 1 | N/A | N/A |
| sensor_band_parameters/F0 | sensor_band_parameters/F0 | W m^-2 um^-1 | float32 | -32767 | 0 to 250 | N/A | N/A |
| sensor_band_parameters/k_no2 | sensor_band_parameters/k_no2 | cm^2 molecule^-1 | float32 | -32767 | 0 to 0.10000000149012 | N/A | N/A |
| sensor_band_parameters/k_oz | sensor_band_parameters/k_oz | cm^-1 | float32 | -32767 | 0 to 0.10000000149012 | N/A | N/A |
| sensor_band_parameters/Tau_r | sensor_band_parameters/Tau_r | N/A | float32 | -32767 | 0 to 0.5 | N/A | N/A |
| sensor_band_parameters/vcal_gain | sensor_band_parameters/vcal_gain | N/A | float32 | -32767 | 0 to 2 | N/A | N/A |
| sensor_band_parameters/vcal_offset | sensor_band_parameters/vcal_offset | mW cm^-2 um^-1 sr^-1 | float32 | -32767 | 0 to 10 | N/A | N/A |
| sensor_band_parameters/wavelength | sensor_band_parameters/wavelength | nm | int32 | -32767 | 0 to 1000 | N/A | N/A |