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Algae Dataset
Every data hub, dataset, sensor, variable, paper and limitation in one tree — and for each: where it comes from, how far back it goes, how often it captures, why it belongs in a cholera study, and why it does not work everywhere.
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Chakaria HDSS
Matlab HDSS
Dhaka City
Choosing a site greys out everything that does not apply there.
- +DATA HUBSwhere the data physically comes from
- +DATASET TYPESgrouped by what kind of water they see
- +SITE-WISEwhat actually applies at each site
- +DURATION & CAPTURE CADENCEdaily · weekly · 10-day · 16-day · monthly
- +VARIABLESwhat is computed from the bands
- −LIMITATIONSwhy not — typed and severity-ranked
- +PAPERSthe evidence, DOI-linked
CRITICAL Sen2Cor is land-optimised and fails over dark turbid water algorithmic
GEE's Sentinel-2 L2A uses Sen2Cor, which was designed for land surfaces. Over dark eutrophic water it frequently returns NEGATIVE reflectance, which propagates into any index built from it.
What to do: For anything you intend to publish as a concentration, download L1C from the Copernicus Data Space and run ACOLITE Dark Spectrum Fitting - dataset AL18. Alternatively calibrate locally against in-situ chlorophyll, or use the Bangladeshi coefficients in Sarker et al. 2019.