N: 90 S: -90 E: 180 W: -180
Description
The UAVI_UAA data suite provides the Ultraviolet Absorbing Aerosol Index (UVAI) calculated using the Unified Aerosol Algorithm. UVAI is a unitless, semi-quantitative indicator of light-absorbing aerosols (e.g., smoke, mineral dust), sensitive to their amount, altitude, and absorption strength; positive values typically flag absorbing plumes, while values near/below zero indicate weakly or non-absorbing conditions. Common uses include plume detection and tracking, air-quality and climate analyses, and providing aerosol context for ocean-color atmospheric correction; users should apply recommended screening in the file attributes.
Core geophysical variables in this suite include:
• NUV_AerosolIndex — Near-UV aerosol index from 0.354/0.388 µm pair (unitless)
• NUV_Reflectivity — Near-UV Lambertian equivalent reflectance (LER) at 0.354 and 0.388 µm (unitless)
• NUV_Residue — Near-UV LER-based aerosol index from 0.354/0.388 µm pair (unitless)
Product Summary
Citation
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GENERAL DOCUMENTATION
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 |
|---|---|---|---|---|---|---|
| geolocation_data/latitude | Geodetic Latitude_1km | degree_north | float32 | -999 | N/A | N/A |
| geolocation_data/Latitude | geolocation_data/Latitude | degree_north | float32 | -999 | N/A | N/A |
| geolocation_data/longitude | Geodetic Longitude_1km | degree_east | float32 | -999 | N/A | N/A |
| geolocation_data/Longitude | geolocation_data/Longitude | degree_east | float32 | -999 | N/A | N/A |
| geophysical_data/NUV_AerosolIndex | NUV Retrieved Aerosol Index (0.354,0.388) Pair at native 1km resolution | N/A | int16 | -9999 | N/A | 0.0010000000474975 |
| geophysical_data/NUV_Reflectivity | NUV Retrieved LERs for 0.354 and 0.388 micron at native 1km resolution | N/A | int16 | -9999 | N/A | 0.0010000000474975 |
| geophysical_data/NUV_Residue | NUV Retrieved LER based AI (0.354,0.388) Pair at native 1km resolution | N/A | int16 | -9999 | N/A | 0.0010000000474975 |
| scan_line_attributes/HAM_side | Half-angle mirror side | N/A | uint8 | 255 | 0 to 1 | N/A |
| scan_line_attributes/scantime | scan time | seconds since 2025-01-12 | float64 | -32767 | 0 to 172802 | N/A |
| scan_line_attributes/scan_quality_flags | Scan quality flags | none | uint8 | 255 | N/A | N/A |
| Wavelength_Used_UV1 | Wavelength_Used_UV1 | nm | float32 | -32767 | N/A | N/A |