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.
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All three
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
SPECTRAL limitations
HIGH No red-edge band, so no NDCI spectral
Landsat has no band near 705 nm. The green/blue ratio used instead is the open-ocean approach and is known to fail in turbid productive water - which is every water body in this study.
What to do: Treat the Landsat chlorophyll series as a RELATIVE index only, and never splice it to a Sentinel-2 NDCI series without the bias correction in 11_algae_daily_fill.py.
HIGH No 620 nm band, so phycocyanin is a proxy only spectral
Sentinel-2 cannot measure the cyanobacteria-specific phycocyanin absorption feature. The B3/B5 ratio used as a stand-in responds to chlorophyll as well, so it cannot cleanly separate a harmful cyanobacterial bloom from a benign green-algal one.
What to do: At Chakaria and Matlab use Sentinel-3 OLCI band Oa07 for the true retrieval. At Dhaka - where cyanobacteria dominate - only the proxy exists. That is the main methodological risk in the study and it must be stated in the limitations section.