MODIS-Aqua Level-3 SMI

NASA OB.DAAC

Specification

Code: AL06
Reliability: A Reliable
Variables delivered: Chlorophyll-a (OC3M), Rrs 412/443/488/531/547/555/667, FAI-capable bands, SST, PAR, Kd490, POC
Resolution: 4.6 km
Cadence: Daily / 8-day / monthly
Coverage: 2002-07 → present
Cost: FREE
Login required: No (GEE) / free Earthdata login for direct download
Latency: ~1-2 d NRT, ~2 wk refined
CSV direct?: Via ERDDAP .csv or GEE
Sensor: MODIS Aqua L3 — 4600 m, 1 day revisit

Chakaria HDSS YES Rural COASTAL

YES — long single-sensor record for the Chakaria coastal box

Matlab HDSS PARTIAL Rural riverine

Regional forcing only

Dhaka City NOT APPLICABLE Urban inland

NOT APPLICABLE

Route: GEE · OB.DAAC file_search API · ERDDAP · OPeNDAP
Endpoint / asset ID: NASA/OCEANDATA/MODIS-Aqua/L3SMI | oceandata.sci.gsfc.nasa.gov/api/file_search
Pipeline step: 3 Extract
Documentation: https://developers.google.com/earth-engine/datasets/catalog/NASA_OCEANDATA_MODIS-Aqua_L3SMI

cd 01_Scripts
python 10_algae_daily_3sites.py --sensors ocean

VALIDATION STATUS

The most-validated ocean-colour record in existence

KNOWN LIMITATION

OC3M overestimates chlorophyll in turbid case-2 water near the delta. Flag using Rrs667.