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FACET - Observatoire Satellital des Forêts d'Afrique Centrale

These atlas were produced as a part of the OSFAC initiative “Monitoring the forests of Central Africa using remotely sensed data sets” (FACET in French). FACET is led by OSFAC in collaboration with South Dakota State University and the University of Maryland, and supported by USAID CARPE. Additional support was provided by World Resources Institute.

 FACET (Central African Forests Remotely Assessed) is a OSFAC project whose goal is to quantify the spatiotemporal dynamics of the forest change in Central Africa through the use of multi-temporal satellite data. The series of multi-temporal data of the FACET project will also be a useful addition to many projects, including: monitoring of biodiversity, climate modeling and biogeochemical data, the natural resource management and planning of the use of soils. The results of the FACET project will describe as the loss of forest cover through deforestation or degradation that its expansion by reforestation or afforestation. All results will be made available to the public.

FACET publications are the result of an analysis by OSFAC which was used to map the extent of forest cover and changes in Central Africa.

The method used is the "wall-to-wall", a method developed jointly by the universities of South Dakota and Maryland. It is an adaptation of the approach of Hansen et al. (2008). MODIS Satellite data (Moderate Resolution Imaging Spectroradiometer) were used to pretreat the Landsat series, themselves used to characterize the extension and the loss of the forest cover. Landsat ETM + data were sampled at a spatial resolution of 60 meters. Mapping the extent and loss of forest cover by Landsat is severely limited to areas permanently covered by clouds. MODIS data were used to overcome this problem. The forest was defined as a space occupied by trees over 5 meters in height and having a canopy density of above 30%.

Primary forest is defined as a mature forest with a canopy density of above 60%. Secondary forest is a forest that has delayed and whose canopy covers more than 60% of the soil surface. A wood (woodland) is characterized by a density of forest cover between 30% and 60%. The swamp forest is defined as a primary forest located on a wetland. Wetlands are lands transitional between terrestrial and aquatic systems where the water table is usually at or near the surface or where the land is covered by shallow water, regardless of vegetation cover. Permanent water bodies were mapped separately.

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