Network panel

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.

1. Ocean colour (merged)

AL01 · ESA Ocean Colour CCI v6.0 — merged multi-sensor chlorophyll-a

ESA Climate Change Initiative / Plymouth Marine Laboratory

A+ Gold FREE NO ACCOUNT

Source · duration · capture cadence

Data source: ESA Climate Change Initiative / Plymouth Marine Laboratory
Access route: ERDDAP (CSV) · THREDDS/OPeNDAP · CEDA · CMEMS
Endpoint / asset: oceanwatch.pifsc.noaa.gov/erddap → esa-cci-chla-monthly-v6-0 | comet.nefsc.noaa.gov/erddap → occci_V6_monthly_4km | www.oceancolour.org/thredds
Duration: 1997-09 → 2024/25 (rolling)
Capture cadence: Daily / 5-day / 8-day / MONTHLY
Resolution: 4 km (1 km regional available)
Delivers: Chlorophyll-a, Rrs (incl. 412 & 555 nm for SWM), Kd490, IOPs, PFT
Command: 07_algae_api_download.py --sources erddap

Why it is used for cholera. Extensively validated · bias-corrected across sensors · the reference product for climate work

Why not — catalogue limitation. 4 km is far too coarse for any inland water body. Case-2 (turbid) bias remains inside the estuary.

Site applicability

Site	Verdict	Why
Chakaria HDSS	YES	ESSENTIAL — this is THE chlorophyll record for Chakaria's coastal waters
Matlab HDSS	PARTIAL	Regional forcing only — 4 km cannot resolve the Meghna
Dhaka City	NOT APPLICABLE	NOT APPLICABLE — 4 km, 300 km inland

Reliable · accessible · authentic

A+ Gold

Reliability tier

OPEN

Accessible

ESA Climate Change Initiative

Authentic — operator

Documentation: https://climate.esa.int/en/projects/ocean-colour/

Typed limitations (2)

CRITICAL 4 km pixel cannot resolve any inland water body spatial blocks Matlab blocks Dhaka

A single OC-CCI pixel is 16 km2. The widest reach of the Meghna is 6 km and every Dhaka lake is under 1 km across, so an inland pixel is dominated by land reflectance. The value returned is not a measurement of that water.

What to do: Use it as a REGIONAL FORCING term only, prefixed reg_ in the merged panel so it cannot be misread as local exposure. For inland chlorophyll use Sentinel-2.

MEDIUM Monthly cadence cannot resolve a two-week bloom temporal

OC-CCI monthly is the defensible cadence for this product, but a bloom that initiates and collapses inside four weeks is invisible in it.

What to do: Pair with MODIS 8-day or VIIRS daily where the coastal signal needs finer timing - accepting that those are noisier.