AVW quantifies the spectral center of water-leaving reflectance in nanometers, indicating water type from clear blue to productive green/brown waters. This Level-4 binned dataset is produced by the OB_CLOUD organization using NASA's Aqua MODIS satellite sensor. The specific version is 2022.0.
Use Cases
- Classify global water types by analyzing the `avw` variable to distinguish oligotrophic from productive or sediment-influenced waters.
- Guide chlorophyll-a retrieval algorithm selection by using `avw` as a contextual feature alongside `chlor_a` and other ocean-color products.
- Detect regional changes in marine optical properties over time by analyzing spatiotemporal patterns in the `avw` time-series data.
- Study coastal and inland water optical complexity by interpreting `avw` variations in conjunction with quality flags for cloud and aerosol interference.
Strengths
- Global spatial coverage from satellite observations.
- Provides a single, standardized geophysical variable (`avw`) for analysis.
- Version 2022.0 indicates a specific, processed release.
Limitations
- Interpretation of the `avw` variable can be ambiguous in optically complex coastal and inland waters.
- Requires review of quality flags for cloud, glint, and aerosol effects which are not detailed in the input.
- Row count, sample size, and temporal range are unknown.
Provenance
- Source
- NASA Earthdata (Aqua MODIS satellite), processed by OB_CLOUD.
- Collection Method
- Derived from satellite-measured water-leaving reflectance spectra (Rrs) across the visible range.
- Time Range
- null
- Freshness
- null
- Geography
- Global ocean coverage.