Surface Water Quality
Bio-optical layers over inland water: cyanobacteria pigment, chlorophyll and particulate turbidity.
Screening for pigment and turbidity over inland water, using published fits applied unchanged.
Bio-optical layers over an inland water body: cyanobacteria pigment, chlorophyll and particulate turbidity.
WHAT IT FINDS
What it detects.
| Material | Typical setting | What can confuse it |
|---|---|---|
| Phycocyanin (Cyanobacterial Biomass) | Eutrophic inland lakes, reservoirs, and mine water retention dams | Coloured dissolved organic matter at the blue end |
| Total Suspended Solids (TSS) & Turbidity | Catchment runoff plumes and river deltas | Sun glint and shallow water benthic reflectance |
METHOD
How it works.
Calibrated reflectance goes in, and every pixel is fitted against a public reference library.
Product level gate
Only water-leaving reflectance products are accepted. A land-corrected reflectance product over water produces numbers that look entirely reasonable and are wrong, so the gate is keyed on product level rather than on which bands the sensor happens to carry.
Glint and adjacency handling
Surface glint is removed and the land boundary effect is corrected before any pigment is estimated.
Narrowband pigment baseline
The pigment signal is taken against a baseline drawn from the channels either side of it.
Domain refusal and masking
Land, cloud shadow and shallow water are masked. Where the water falls outside the domain the published fit was derived for, the layer returns a stated reason instead of a number.
SPECIFICATIONS
What you get, and what it runs on.
Conditions it needs
Method and checks are documented in Axine Applied Spectroscopy Paper #3 · Section 4.3.
Scope
A screening layer over open, optically deep water. Shallow bottoms and narrow channels are refused.
RUN IT OVER YOUR GROUND
Run this layer over your own area.
Order processing over your area of interest, or a tasked capture where the archive has nothing usable. Imagery access is never charged for: a plan buys the models.
COMPLEMENTARY ANALYTICS
Related layers.
Acid Drainage Screening
Screening for precipitate coatings along discharge channels, with a ferric floor gating the read.
Thermal Water Discharge Anomaly
Brightness temperature contrast at discharge points, against a local baseline drawn from the surrounding water.
Tailings Dam Stability & Seepage
Monitors moisture and sulfate weathering on exposed embankment faces, differenced across dates.