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.
- +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
- +Matlab HDSSMatlabRural riverine · 250 km to sea · 11 datasets apply
- −Dhaka CityDhakaUrban inland · 300 km to sea · 9 datasets apply
- ·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)
- ·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
- ·AL22 · SeaBASS — NASA bio-Optical Archive and Stor…Per cruise/campaign · Point
- ·AL23 · GLORIA — Global Reflectance community datas…Per sample · Point
- ·AL24 · LIMNADES — LIMnology and remote sensing Net…Per sample · Point
- +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
Dhaka City
Urban inland ·
23.78660 N, 90.42350 E · 17.6 x 26.0 km ·
300 km to the Bay of Bengal
- Water bodies
- Hatirjheel, Gulshan/Banani/Dhanmondi/Ramna/Crescent lakes · Buriganga, Turag, Balu, Shitalakshya rivers · Tongi Khal · thousands of ponds
- Trophic state
- Hyper-eutrophic. Heavy untreated sewage and industrial load. Dense, persistent cyanobacterial blooms.
- Algae regime
- LOCAL eutrophic blooms dominate. Coastal plankton intrusion is essentially irrelevant at this distance.
- Ocean colour
- REGIONAL FORCING ONLY — reg_ prefix
9
datasets apply
6
partial
11
not applicable
What works here
| Dataset | Cadence | Duration | Res | Why |
|---|---|---|---|---|
| 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 — the ONLY sensor that sees Hatirjheel, Gulshan Lake and the Buriganga |
| 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 |
| AL18 Sentinel-2 Level-1C + ACOLITE Dark Spec… | 5 days | 2015-06→present | 10-20 m |
THE RIGOROUS ROUTE for urban lakes |
| 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 |
| AL22 SeaBASS — NASA bio-Optical Archive and … | Per cruise/campaign | 1980s→present | Point |
Unlikely |
| AL23 GLORIA — Global Reflectance community d… | Per sample | 1980s→2021 | Point |
HIGH — includes hyper-eutrophic waters |
| AL24 LIMNADES — LIMnology and remote sensing… | Per sample | 1980s→present | Point |
HIGH — the largest phycocyanin in-situ archive · essential if you pursue cyanobacteria |
What does NOT work here — and why
| Dataset | Reason |
|---|---|
| AL15 PACE OCI — hyperspectral 380-900 nm at … | NOT APPLICABLE |
| AL01 ESA Ocean Colour CCI v6.0 — merged mult… | NOT APPLICABLE — 4 km, 300 km inland |
| AL02 Copernicus Marine GlobColour — L4 gap-f… | NOT APPLICABLE |
| AL11 Copernicus CDS — Satellite Ocean Colour… | NOT APPLICABLE |
| AL06 MODIS-Aqua Level-3 SMI | NOT APPLICABLE |
| AL07 SeaWiFS Level-3 SMI | NOT APPLICABLE |
| AL08 VIIRS SNPP / NOAA-20 chlorophyll (NOAA … | NOT APPLICABLE |
| AL13 MODIS-Terra Level-3 SMI | NOT APPLICABLE |
| AL21 OCTS / CZCS historical ocean colour | NOT APPLICABLE |
| AL16 MODIS MOD09GA/GQ daily surface reflecta… | NOT APPLICABLE — every Dhaka water body is sub-250 m |
| AL12 CMEMS Global Ocean Biogeochemistry Rean… | NOT APPLICABLE |
Site-specific problems
CRITICAL Dhaka has almost no pre-2015 algae observation coverage blocks Dhaka
Every Dhaka water body is below 250 m, so MODIS and Sentinel-3 are both unusable. Landsat at 16 days is the only option before 2015, giving roughly 5 percent of days observed - a daily series for 2000-2014 would be about 95 percent invented.
What to do: Model the pre-2015 Dhaka era MONTHLY, or restrict the daily analysis to 2017 onward. Always report the sensitivity analysis restricted to fill_method equals observed.
MEDIUM Dhaka polygon is a GADM level-3 unit labelled Tejgaon coverage blocks Dhaka
Dhaka_City.shp has NAME_3 = 'Tejgaon' but an extent of 17.6 x 26.0 km, which is city-scale rather than thana-scale. It works fine as a city AOI, but the label is misleading.
What to do: Describe it in the manuscript as a Dhaka city bounding polygon with the extent stated - not as Tejgaon thana.