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
- −Chakaria HDSSChakariaRural COASTAL · 10 km to sea · 16 datasets apply
- ·AL01 · ESA Ocean Colour CCI v6.0 — merged multi-se…Daily / 5-day / 8-day / M… · 4 km (1 km regional available)
- ·AL02 · Copernicus Marine GlobColour — L4 gap-free …DAILY (gap-free!) · 4 km
- ·AL11 · Copernicus CDS — Satellite Ocean Colour (OC…Daily / monthly · 4 km
- ·AL06 · MODIS-Aqua Level-3 SMIDaily / 8-day / monthly · 4.6 km
- ·AL07 · SeaWiFS Level-3 SMIDaily / 8-day / monthly · 9 km (4 km avail.)
- ·AL08 · VIIRS SNPP / NOAA-20 chlorophyll (NOAA Coas…DAILY · 4 km (750 m for some SNPP products)
- ·AL13 · MODIS-Terra Level-3 SMIDaily / 8-day / monthly · 4.6 km
- ·AL03 · Sentinel-2 MSI Level-2A (harmonised)5 days (2-3 d with S2C fr… · 10 m (B2,3,4,8) / 20 m (B5 red-edge 705 nm)
- ·AL04 · Sentinel-3 OLCI — 21 bands incl. 620 nm (ph…~1-2 days (S3A + S3B) · 300 m full resolution
- ·AL05 · Landsat 5 / 7 / 8 / 9 Collection 2 Level-216 days per satellite (~8… · 30 m
- ·AL14 · Harmonized Landsat Sentinel-2 (HLS) v2.02-3 days combined · 30 m
- ·AL18 · Sentinel-2 Level-1C + ACOLITE Dark Spectrum…5 days · 10-20 m
- ·AL19 · GEE Sen2Cor L2A NDCI → chlorophyll polynomi…5 days · 10-20 m
- ·AL20 · Landsat green/blue chlorophyll proxy (2000-…16 days · 30 m
- ·AL23 · GLORIA — Global Reflectance community datas…Per sample · Point
- ·AL25 · Bangladesh Oceanographic Research Institute…Varies · Point
- +Matlab HDSSMatlabRural riverine · 250 km to sea · 11 datasets apply
- +Dhaka CityDhakaUrban inland · 300 km to sea · 9 datasets apply
- −Chakaria HDSSChakariaRural COASTAL · 10 km to sea · 16 datasets apply
- +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
Site
Chakaria HDSS
Rural COASTAL ·
21.78940 N, 92.05500 E · 22.9 x 29.4 km ·
10 km to the Bay of Bengal
- Water bodies
- Matamuhuri river and estuary · Moheshkhali channel · Chakaria Sundarbans - former mangrove now converted to extensive SHRIMP AQUACULTURE PONDS · salt pans · Bay of Bengal within ~10 km of the western boundary
- Trophic state
- Estuarine-brackish, strongly eutrophic in the shrimp-pond belt. Salinity gradient from fresh (east, hilly) to fully marine (west).
- Algae regime
- THE KEY SITE. Coastal ocean-colour chlorophyll from the Bay of Bengal IS directly applicable here. Brackish shrimp ponds sit in exactly the salinity band optimal for Vibrio cholerae. Both the regional plankton-intrusion pathway and local aquaculture blooms are in play.
- Ocean colour
- DIRECTLY APPLICABLE
16
datasets apply
8
partial
2
not applicable
What works here
| Dataset | Cadence | Duration | Res | Why |
|---|---|---|---|---|
| AL01 ESA Ocean Colour CCI v6.0 — merged mult… | Daily / 5-day / 8-day /… | 1997-09→2024/25 (ro… | 4 km (1 km regional available) |
ESSENTIAL — this is THE chlorophyll record for Chakaria's coastal waters |
| AL02 Copernicus Marine GlobColour — L4 gap-f… | DAILY (gap-free!) | 1997-09→present | 4 km |
ESSENTIAL — daily gap-free chlorophyll for the Chakaria coastal box |
| AL11 Copernicus CDS — Satellite Ocean Colour… | Daily / monthly | 1997-09→present | 4 km |
YES — same data as AL01, different delivery |
| AL06 MODIS-Aqua Level-3 SMI | Daily / 8-day / monthly | 2002-07→present | 4.6 km |
YES — long single-sensor record for the Chakaria coastal box |
| AL07 SeaWiFS Level-3 SMI | Daily / 8-day / monthly | 1997-09-04→2010-12-11 … | 9 km (4 km avail.) |
YES — and it is the sensor ALL the classic cholera-chlorophyll papers used |
| AL08 VIIRS SNPP / NOAA-20 chlorophyll (NOAA … | DAILY | 2017 (SNPP) / 2019 (N20)→present | 4 km (750 m for some SNPP products) |
YES — easiest daily coastal chlorophyll you can get · zero setup |
| AL13 MODIS-Terra Level-3 SMI | Daily / 8-day / monthly | 2000-02-24→present | 4.6 km |
YES — and it is the ONLY 4 km sensor covering Feb 2000 to mid-2002 |
| AL03 Sentinel-2 MSI Level-2A (harmonised) | 5 days (2-3 d with S2C … | 2015-06 (L1C) / 2017-03 (L2A)→present | 10 m (B2,3,4,8) / 20 m (B5 red-edge 705 nm) |
HIGHEST VALUE — resolves individual shrimp ponds in the Chakaria Sundarbans |
| AL04 Sentinel-3 OLCI — 21 bands incl. 620 nm… | ~1-2 days (S3A + S3B) | 2016-10→present | 300 m full resolution |
CRITICAL — resolves the Matamuhuri estuary AND has the 620 nm cyanobacteria band |
| AL05 Landsat 5 / 7 / 8 / 9 Collection 2 Leve… | 16 days per satellite (… | 1984 (L5) / 1999 (L7) / 2013 (L8→present | 30 m |
ESSENTIAL for 2000-2015 |
| AL14 Harmonized Landsat Sentinel-2 (HLS) v2.0 | 2-3 days combined | 2013 (L30) / 2015 (S30)→present | 30 m |
HIGH — near-weekly 30 m over the shrimp ponds |
| AL18 Sentinel-2 Level-1C + ACOLITE Dark Spec… | 5 days | 2015-06→present | 10-20 m |
THE RIGOROUS ROUTE for shrimp ponds |
| AL19 GEE Sen2Cor L2A NDCI → chlorophyll poly… | 5 days | 2017-03→present | 10-20 m |
SCREENING ONLY |
| AL20 Landsat green/blue chlorophyll proxy (2… | 16 days | 1984→present | 30 m |
USE WITH EXPLICIT CAVEAT |
| AL23 GLORIA — Global Reflectance community d… | Per sample | 1980s→2021 | Point |
HIGH — train/validate a retrieval model on similar optical water types |
| AL25 Bangladesh Oceanographic Research Insti… | Varies | 2000s→present | Point |
THE ONLY LOCAL GROUND TRUTH for the Cox's Bazar coast — pursue this |
What does NOT work here — and why
| Dataset | Reason |
|---|---|
| AL21 OCTS / CZCS historical ocean colour | LOW — predates your period |
| AL10 ESA CCI Lakes v2.x | LOW — 1 km, and the lake mask is unlikely to include Chakaria's ponds |
Site-specific problems
HIGH Chakaria boundary has no internal units spatial blocks Chakaria
HDSS_Chakaria_Boundary.shp is a single polygon with only OBJECTID, Shape_Leng and Shape_Area. The 11 unions in the config are not in the file. The east side is hilly and the west is coastal lowland with the shrimp-pond belt - completely different hydrology and salinity.
What to do: Either request the union-level shapefile, or derive the stratum from SRTM elevation at or below 5 m combined with distance to coast. Pooling the two halves averages away the exposure contrast the study is trying to detect.