Axine Labs
Free / commercial imagery

Qualidade de Águas Superficiais

Camadas bio-ópticas sobre águas interiores: pigmento de cianobactérias, clorofila e turbidez particulada.

Triagem de pigmento e turbidez sobre águas interiores, usando ajustes publicados aplicados sem alterações.

Qualidade de Águas Superficiais
In view

Bio-optical layers over an inland water body: cyanobacteria pigment, chlorophyll and particulate turbidity.

O QUE ELA ENCONTRA

O que ela detecta.

MaterialContexto típicoO que pode confundi-la
Phycocyanin (Cyanobacterial Biomass)Eutrophic inland lakes, reservoirs, and mine water retention damsColoured dissolved organic matter at the blue end
Total Suspended Solids (TSS) & TurbidityCatchment runoff plumes and river deltasSun glint and shallow water benthic reflectance

MÉTODO

Como funciona.

Entra reflectância calibrada, e cada pixel é ajustado contra uma biblioteca pública de referência.

01Step 1

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.

02Step 2

Glint and adjacency handling

Surface glint is removed and the land boundary effect is corrected before any pigment is estimated.

03Step 3

Narrowband pigment baseline

The pigment signal is taken against a baseline drawn from the channels either side of it.

04Step 4

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.

ESPECIFICAÇÕES

O que você recebe, e sobre o que ela roda.

Valores entreguesBio-optical indices, floating point
SaídaSurface water bio-optical raster
Prazo de entregaOcean-colour granules are small next to hyperspectral ones, so these jobs clear quickly
Formatos
Cloud-Optimized GeoTIFF (COG)Vector Water Body Polygons (GeoJSON)Provenance record (published fit used, granule id, refusal reasons)

Condições de que precisa

Sun angle limit:55°
Cloud cover limit:5%
Vegetation cover limit:10%

Method and checks are documented in Axine Applied Spectroscopy Paper #3 · Section 4.3.

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Escopo

A screening layer over open, optically deep water. Shallow bottoms and narrow channels are refused.