SatHDSS
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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.

Highlight site All three Chakaria HDSS Matlab HDSS Dhaka City Choosing a site greys out everything that does not apply there.

2. Inland/coastal high-res

AL04 · Sentinel-3 OLCI — 21 bands incl. 620 nm (phycocyanin) & 709 nm (red edge)
ESA / EUMETSAT / Copernicus
A+ Gold FREE NO ACCOUNT

Source · duration · capture cadence

Data source
ESA / EUMETSAT / Copernicus
Access route
GEE (TOA only) · CMEMS · EUMETSAT Data Store API · CDSE
Endpoint / asset
COPERNICUS/S3/OLCI (TOA — bring your own atmospheric correction) | CMEMS OLCI L2 WFR
Duration
2016-10 → present
Capture cadence
~1-2 days (S3A + S3B)
Resolution
300 m full resolution
Delivers
PHYCOCYANIN (620 nm) , chlorophyll (MCI, NDCI), Rrs 412/555 for SWM, TSM
Command
10_algae_daily_3sites.py --sensors s3
Why it is used for cholera. OLCI L2 WFR validated for coastal water · phycocyanin retrieval is still research-grade
Why not — catalogue limitation. GEE holds only TOA radiance — you must run C2RCC / POLYMER / ACOLITE yourself or pull L2 from CMEMS. Starts 2016.

Site applicability

SiteVerdictWhy
Chakaria HDSS YES CRITICAL — resolves the Matamuhuri estuary AND has the 620 nm cyanobacteria band
Matlab HDSS YES CRITICAL — the Meghna is 2-6 km wide, so 300 m works beautifully · near-daily revisit
Dhaka City PARTIAL MARGINAL — only the widest reaches of the Buriganga and the largest lakes

Reliable · accessible · authentic

A+ Gold
Reliability tier
OPEN
Accessible
ESA
Authentic — operator
Documentation: https://developers.google.com/earth-engine/datasets/catalog/COPERNICUS_S3_OLCI

Typed limitations (1)

HIGH 300 m needs water wider than about 600 m spatial blocks Dhaka

A 300 m pixel needs at least two clean pixels across the water body to avoid land contamination. The Matamuhuri estuary and the Meghna main channel qualify comfortably. In Dhaka only the widest reaches of the Buriganga and Shitalakshya come close, and even there the pixels are mixed - Hatirjheel is roughly 200 m at its widest, so every lake is out. The catalogue records Dhaka as MARGINAL rather than impossible for this reason.

What to do: At Dhaka use the Sentinel-2 B3/B5 phycocyanin proxy instead, and state clearly in the methods that it is a proxy rather than the 620 nm retrieval.
Full dataset page →