Knowledge for Development

The Global Forest Disturbance Alert System (GloF-DAS)

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Date: 11/07/2012

Introduction:

GloF-DAS is based on a new product derived from satellite data from NASA's Moderate Resolution Imaging Spectroradiometer (MODIS). The product, developed at NASA Ames Research Centre by the Carnegie-Ames-Stanford Approach (CASA) ecosystem modelling team, is based on comparison of MODIS global vegetation index images at the exact same time period each year in consecutive years. It registers change when more than 40 % of a five-by-five km forest area has lost greenness over the previous 12 months. Seasonal variation is generally mitigated through the product's quarterly baseline. GloF-DAS could help users detect deforestation shortly after it occurs, offering the potential to take measures to investigate clearing before it expands. (Mongabay via Agro.biodiv.se, 31/5/2012)

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