Global Forest Disturbance Alert System
The Global Forest Disturbance Alert System (GloFDAS) provides data on forest disturbance globally on a quarterly basis.
Reliable maps of global forest cover change are frequently years
out-of-date. Consequently, there is a pressing need to develop
techniques for monitoring and verifying land cover change and forest
disturbances in a timely, low-cost, and accurate manner. Satellite
remote sensing from instruments such as NASA's Moderate Resolution
Imaging Spectroradiometer (MODIS) offers a consistent and cost-effective
method for mapping forest cover change. MODIS data are obtained freely
with global daily cover products.
A new MODIS product called the "Quarterly Indicator of Cover Change"
(QUICC) has been developed at NASA Ames Research Center by the CASA
ecosystem modeling team. The QUICC product is based on comparison of
MODIS global vegetation index images at the exact same time period each
year (ending of March, June, September, and December) in consecutive
years. The CASA team updates its global QUICC products as soon as the
newest quarterly MODIS worldwide VI image at 5-km spatial resolution is
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GloFDAS is done in partnership with Cal State Monterey Bay and NASA Ames Research Center.