Geospatial data

Satellite - Ocean Colour - MODIS - 1 day - Chlorophyll-a concentration (GSM model)

The Aqua satellite platform carries a MODIS sensor that observes sunlight reflected from within the ocean surface layer at multiple wavelengths. These multi-spectral measurements are used to infer the concentration of chlorophyll-a (Chl-a), most typically due to phytoplankton, present in the water. There are multiple retrieval algorithms for estimating Chl-a. These data use the Garver-Siegel-Maritorena (GSM) method implemented in the SeaDAS processing software l2gen and described in “Chapter 11, and references therein, of IOCCG Report 5, 2006, (http://ioccg.org/wp-content/uploads/2015/10/ioccg-report-05.pdf).

Listed for discovery. Access is provided by the original publisher under its terms.

Data coverage

Access & permitted use

Review the publisher’s documentation for availability, eligibility and permitted uses, including commercial analysis, model training and redistribution.

http://creativecommons.org/licenses/by/4.0/

Need help sourcing data?

Tell us your required fields, population, geography and time period. We can review suitable sources and licensing options.

Request sourcing help

Related data sources

Clinical trialsOpen API

ClinicalTrials.gov Study Records

Registered clinical studies, recruitment status, interventions, conditions, sponsors and reported results. Searchable structured records available through the ClinicalTrials.gov API.

ClinicalTrials.gov / U.S. National Library of Medicine

Drug safetyOpen API

FDA Drug Adverse Event Reports

Publicly releasable drug adverse event and medication error reports drawn from FAERS, provided as queryable JSON through openFDA.

U.S. Food and Drug Administration

Population healthPublic download

CDC BRFSS 2025 Survey Microdata

Annual U.S. behavioral risk-factor survey covering chronic conditions, health behaviors and preventive care. The 2025 release contains 356,158 survey records.

Centers for Disease Control and Prevention