Axine Labs
Free / commercial imagery

Clorofila do Dossel e Borda Vermelha

Posição de inflexão da borda vermelha, acompanhada entre aquisições sobre floresta manejada.

Posição da borda vermelha, que acompanha o pigmento do dossel. Recusada em sensores que não conseguem resolvê-la.

Clorofila do Dossel e Borda Vermelha
In view

Red-edge inflection position across a managed forest, tracked between acquisitions.

O QUE ELA ENCONTRA

O que ela detecta.

MaterialContexto típicoO que pode confundi-la
Red-edge inflection positionManaged forests, natural stands, and broadacre cropsSelf-shadowing in steep terrain and aerosol scattering in deep valleys

MÉTODO

Como funciona.

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

01Step 1

Band feasibility check

Feasibility is derived from band centre, band width, ground sample and product level, not from a hand-kept list per sensor. An instrument with no band inside the red edge is refused before anything is computed.

02Step 2

First-derivative inflection extraction

Locates the steepest point of the red edge, which is where canopy pigment shows up.

03Step 3

Time series over the stand

One point per acquisition, ordered by ground time, with gaps left visible and superseded points counted rather than quietly dropped.

04Step 4

Quality masking

Snow, water, cloud shadow and exposed rock are masked out.

ESPECIFICAÇÕES

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

Valores entreguesInflection wavelength in nanometres, floating point
SaídaRed-edge position raster
Prazo de entregaMultispectral scenes are small and clear quickly; hyperspectral granules are the slow case
Formatos
Cloud-Optimized GeoTIFF (COG)Vector Stand Polygons (GeoJSON)Provenance record (sensor, method version, scene ids)

Condições de que precisa

Sun angle limit:60°
Cloud cover limit:10%
Vegetation cover limit:100%

Method and checks are documented in Axine Applied Spectroscopy Paper #4 · Section 4.1.

Ler o artigo

Escopo

The signal flattens once the canopy is dense, so it separates stressed stands more sharply than healthy ones.