N: 90 S: -90 E: 180 W: -180
Description
The SeaWiFS Deep Blue (SWDB) Level 3 daily global gridded (0.5 x 0.5 deg) data is derived from SeaWiFS Deep Blue Level 2 data. In most cases, each data field represents the arithmetic mean of all cells whose latitude and longitude places it within the bounds of each grid element. Furthermore, only cells measured on the day of interest are included in this calculation. The local date based on the longitude of the cell is calculated from the time of measurement. If the local date equals the day of interest, the cell is included in the L3 data processing.
The primary data parameters are aerosol optical thickness, and Angstrom exponent.
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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 |
|---|---|---|---|---|---|---|
| aerosol_optical_thickness_550_count_land | aerosol_optical_thickness_550_count_land | count | int32 | -999 | N/A | N/A |
| aerosol_optical_thickness_550_count_land_ocean | aerosol_optical_thickness_550_count_land_ocean | count | int32 | -999 | N/A | N/A |
| aerosol_optical_thickness_550_count_ocean | aerosol_optical_thickness_550_count_ocean | count | int32 | -999 | N/A | N/A |
| aerosol_optical_thickness_550_land | aerosol_optical_thickness_550_land | 1 | float32 | -999 | N/A | N/A |
| aerosol_optical_thickness_550_land_ocean | aerosol_optical_thickness_550_land_ocean | 1 | float32 | -999 | N/A | N/A |
| aerosol_optical_thickness_550_ocean | aerosol_optical_thickness_550_ocean | 1 | float32 | -999 | N/A | N/A |
| aerosol_optical_thickness_550_stddev_land | aerosol_optical_thickness_550_stddev_land | 1 | float32 | -999 | N/A | N/A |