N: 90 S: -90 E: 180 W: -180
Description
The Ocean Biology DAAC produces near real-time (NRT) products using the best-available combination of ancillary data from meteorological and ozone data. As such, the inputs and the calibration used are less than optimal. Near real-time products provide a snapshot of the data during a short time period within a single orbit.
Surface Reflectance (SFREFL) provides the unitless, bottom-of-atmosphere reflectance of the Earth’s surface at 122 wavelengths (346 - 895 nm, with 5 SWIR bands). Surface Reflectance is the foundational input for downstream land products (e.g., vegetation indices included in the LANDVI suite). Users should review the documentation for more information on atmospheric correction and quality flags. Users should also note that the L3M product is masked for clouds.
Geophysical variables in this suite include:
- rhos – Surface reflectance (unitless)
- l2_flags – Level-2 Processing Flags (bitmask)
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/l2_flags | Level-2 Processing Flags | N/A | int32 | N/A | -2147483648 to 2147483647 | N/A | N/A |
| geophysical_data/rhos | Surface reflectance | N/A | float32 | -32767 | -0.050000000745058 to 1.5 | N/A | N/A |
| navigation_data/latitude | Latitude | degrees_north | float32 | -999 | -90 to 90 | N/A | N/A |
| navigation_data/longitude | Longitude | degrees_east | float32 | -999 | -180 to 180 | N/A | N/A |
| navigation_data/tilt | Sensor tilt angle | degree | float32 | -32767 | -25 to 25 | N/A | N/A |
| scan_line_attributes/clat | Center Latitude | degrees_north | float32 | -999 | -90 to 90 | N/A | N/A |
| scan_line_attributes/clon | Center Longitude | degrees_east | float32 | -999 | -180 to 180 | N/A | N/A |
| scan_line_attributes/csol_z | Center Solar Zenith Angle | degree | float32 | -999 | -90 to 90 | N/A | N/A |
| scan_line_attributes/day | Scan day of year | days | int32 | -32767 | 0 to 366 | N/A | N/A |
| scan_line_attributes/detnum | Detector Number (zero-based) | N/A | int8 | -1 | 0 to 25 | N/A | N/A |
| scan_line_attributes/elat | Ending Latitude | degrees_north | float32 | -999 | -90 to 90 | N/A | N/A |
| scan_line_attributes/elon | Ending Longitude | degrees_east | float32 | -999 | -180 to 180 | N/A | N/A |
| scan_line_attributes/msec | Scan time, milliseconds of day | milliseconds | int32 | -32767 | 0 to 86400000 | N/A | N/A |
| scan_line_attributes/mside | Mirror Side (zero-based) | N/A | int8 | -1 | 0 to 1 | N/A | N/A |
| scan_line_attributes/slat | Starting Latitude | degrees_north | float32 | -999 | -90 to 90 | N/A | N/A |
| scan_line_attributes/slon | Starting Longitude | degrees_east | float32 | -999 | -180 to 180 | N/A | N/A |
| scan_line_attributes/time | scan line time in seconds since 1970-1-1 | seconds since 1970-1-1 | float64 | -32767 | N/A | N/A | N/A |
| scan_line_attributes/year | Scan year | years | int32 | -32767 | 1900 to 2100 | N/A | N/A |
| sensor_band_parameters/aw | Band-pass averaged absorption coefficient for seawater | m^-1 | float32 | -32767 | 9.9999997473788E-5 to 5 | N/A | N/A |
| sensor_band_parameters/bbw | Band-pass averaged backscattering coefficient for seawater | m^-1 | float32 | -32767 | 4.9999998736894E-6 to 1 | N/A | N/A |
| sensor_band_parameters/F0 | Mean Solar Flux | W m^-2 um^-1 | float32 | -32767 | 0 to 2500 | N/A | N/A |
| sensor_band_parameters/k_no2 | NO2 Absorption cross-sections | cm^2 molecule^-1 | float32 | -32767 | 0 to 0.10000000149012 | N/A | N/A |
| sensor_band_parameters/k_oz | Ozone Absorption cross-sections | cm^-1 | float32 | -32767 | 0 to 0.10000000149012 | N/A | N/A |
| sensor_band_parameters/Tau_r | Rayleigh Optical Thickness | N/A | float32 | -32767 | 0 to 0.5 | N/A | N/A |
| sensor_band_parameters/vcal_gain | Vicarious Calibration Gain | N/A | float32 | -32767 | 0 to 2 | N/A | N/A |
| sensor_band_parameters/vcal_offset | Vicarious Calibration Offset | mW cm^-2 um^-1 sr^-1 | float32 | -32767 | 0 to 10 | N/A | N/A |
| sensor_band_parameters/wavelength | wavelengths | nm | int32 | -32767 | 0 to 20000 | N/A | N/A |
| sensor_band_parameters/wavelength_3d | wavelengths | nm | int32 | -32767 | 0 to 20000 | N/A | N/A |