Alertes de Déforestation GLAD

Biodiversitév02.00 crédits/per_km2

Responsable:Niccolò Calandri

Allerte di deforestazione in tempo quasi reale del sistema UMD GLAD (Global Land Analysis and Discovery), distribuite tramite Resource Watch (WRI). Il layer segnala eventi recenti di disturbo forestale rilevati su immagini Landsat, classificati per livello di confidenza (1 = basso, 2 = medio, 3 = alto) a risoluzione 30 m, così da individuare potenziali perdite di copertura arborea poco dopo che si verificano.

Sources de Données et Références

Sources

WRD_GLAD_01

Méthodologie

Methodology

The layer reads the UMD GLAD near-real-time deforestation alerts from the Google Earth Engine ImageCollection projects/resource-watch-gee/for_003_nrt_rw1_glad_deforestation_alerts. GLAD (Global Land Analysis and Discovery, University of Maryland) detects forest-disturbance events from Landsat time series and publishes them as alerts distributed through Resource Watch (WRI).

Processing

The most recent image in the collection is selected by sorting on system:time_start in descending order and taking the first element.
Band b1 is selected and clipped to the polygon of interest.
Pixel values encode the alert confidence level, rendered on a graduated palette normalised over the range 0-3 (1 = low, 2 = medium, 3 = high confidence).
The image is reprojected to Web Mercator at a native scale of 30 m before download.

Metadata reports the alert date, the maximum alert value found in the area, and the mean confidence over the polygon.

Data Source

Code	Provider	Resolution	Year
WRD_GLAD_01	UMD GLAD via Resource Watch (WRI), Landsat-based	30 m	2024 (near-real-time)