Tropical forest cover monitoring in the humid tropics - TREES project
2002
Achard, F | Stibig, H.J. | Eva, H | Mayaux, P (Joint Research Centre of the European Comminsion, Ispra (Italy))
A large-scale project initiated in the early 1990s, the TREES project, is dedicated to the development of techniques for global tropical forest cover assessment and for monitoring deforestation using satellite imagery. The project has developed a reliable method for global forest change assessment in the humid tropics and has applied this throughout the world. Twenty-seven local partners from tropical countries contributed to TREES. The approach is based on a statistical sampling of observation units with a higher sampling rate for fast changing areeas. A pre-stratification was performed using two parametrs: "forest cover area" (from the 1 km resolution maps produced in the first phase of the project) and "deforestation hot-spot layer" (areas where changes are expected to be higher based on individual expertise). Forest cover change during the period 1992-1997 was estimated from the one hundred sample sites using fine spatial resolution satellite imagery.
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