Axine Labs
Free / commercial imagery

Detecção de Plumas de Metano

Contornos de plumas de fonte pontual sobre plataformas de poços, estações de compressão e instalações de processamento, a partir de acervos hiperespectrais gratuitos.

Realce de coluna sobre instalações de óleo e gás. Produtos públicos de plumas revisados passam adiante com sua proveniência, e nosso próprio filtro roda em paralelo como triagem.

Detecção de Plumas de Metano
In view

Point-source methane column enhancement over oil and gas infrastructure, drawn from the open hyperspectral archive.

O QUE O SENSOR VÊ

O que esta camada procura.

A referência de laboratório de cada material, e o que o espaçamento de bandas do sensor captura dela. A faixa sombreada marca o intervalo que o método lê.

0.600.801.002.100 µm2.170 µm2.240 µm2.310 µm2.380 µm2.450 µmWavelength (µm)Transmittance
Referência de laboratório
Amostragem do sensor
Intervalo de trabalho
Profundidade de banda0.47
Largura da feição66 nm
Espaçamento de bandas7.4 nm

O QUE ELA ENCONTRA

O que ela detecta.

MaterialContexto típicoO que pode confundi-la
Methane column enhancement (ΔCH4)Wellpads, compressor stations, gas pipelines, coal mine vents, and landfillsSurface carbonate and clay absorb in the same window; dark surfaces return too few photons to retrieve from

MÉTODO

Como funciona.

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

01Step 1

Reviewed plume product ingest

Where a public agency has published a reviewed plume for the scene, it is ingested and passed through with its provenance intact. Missing values stay missing, with a stated reason, and no rate is attached that the publisher did not state.

02Step 2

Columnwise matched filter

Background covariance is estimated per detector column with adjacent columns merged, Schafer-Strimmer shrinkage applied, and brightness deflated jointly so a bright roof does not read as gas.

03Step 3

Noise calibration and confuser rejection

The filter output is scaled against its own negative tail, dark pixels are refused outright, and known surface confusers are rejected before anything is drawn.

04Step 4

Connectivity gate

Isolated hot pixels are discarded. A plume has to hold together spatially to survive, which is the cheapest defence against a filter that will always produce some response.

ESPECIFICAÇÕES

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

Valores entreguesColumn enhancement above background, floating point
SaídaMethane column raster and plume polygons
Prazo de entregaIngesting a published plume is quick; running the filter waits on the granule, which is the slow part
Formatos
Cloud-Optimized GeoTIFF (COG)Vector Plume Polygon (GeoJSON)Provenance record (granule id, method version, reasons for missing values)

Condições de que precisa

Sun angle limit:65°
Cloud cover limit:10%
Vegetation cover limit:80%

Method and checks are documented in Axine Applied Spectroscopy Paper #2 · Section 3.4.

Ler o artigo

Escopo

A screening layer that needs sunlight and bright, dry ground. A plume outline is a place to send an inspection.