Service | Resource Locator |
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HTTPS |
S-NPP NRT Anomaly Difference in Data Portal S-NPP NRT Anomaly Ratio (proportional difference) in Data Portal NOAA-20 NRT Anomaly Difference in Data Portal NOAA-20 NRT Anomaly Ratio (proportional difference) in Data Portal |
ERDDAP | |
THREDDS |
Near-real-time (NRT) global daily chlorophyll-a (Chl-a) anomaly products that can be used to detect and identify algae blooms from satellite ocean color measurements such as those from the Visible Infrared Imaging Radiometer Suite (VIIRS) onboard the Suomi National Polar-orbiting Partnership (SNPP) and NOAA-20. Specifically, the production of the two Chl-a anomaly products, one for the Chl-a anomaly in difference and another for the Chl-a anomaly ratio (actually, the proptional difference or relative difference; product is labelled "pdif" in the files) compared to the 61-day Chl-a median value from the previous time period (as a Chl-a reference), has been implemented in the daily global NRT satellite data processing. These two Chl-a anomaly products represent the global ocean and coastal/inland water Chl-a abnormal condition for a given location and can provide more complete characteristics for the daily phytoplankton (or algae) biomass status by comparing to the normal condition.
Key | Description |
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Platform/Sensor | S-NPP/VIIRS |
Measurement/Products | chlorophyll-a anomaly difference |
DOI | |
Short Name | NOAA VIIRS Chlorophyll Anomaly |
Sample Filename | |
Dataset Type | NetCDF-4 |
Processing Level | Level-4 |
Spatial Coverage | Global |
Temporal Coverage | Daily; computed by difference or ratio of a 61 day mean |
Latency | 48 hours |
Resolution | 2km (2.3163 km or 0.02°) |
Projection | Geographic/WGS84 |
Swath Width | N/A |
Sample Frequency | N/A |
Temporal Repeat | daily |
Orbital Period | N/A |
Orbit | N/A |
Data Provider | NOAA |
Formats | NetCDF-4 |
Keywords | NOAA, JPSS, VIIRS, Chlorophyll, Anomaly, CoastWatch, NOAA National Environmental Satellite, Data, and Information Service, Center for Satellite Applications and Research, STAR, global, daily, 4km |
Wang M., L. Jiang, K. Mikelsons, X. Liu, Satellite-derived global chlorophyll-a anomaly products, International Journal of Applied Earth Observation and Geoinformation, Volume 97, 2021, 102288, https://doi.org/10.1016/j.jag.2020.102288.