FRA 2000 - Global forest cover mapping

FRA 2000 - Global forest cover mapping

Year of publication 2001

Place of publication Rome, Italy ;

Product type Book (stand-alone)

Edition 1

Synopsis (short abstract) Many countries periodically produce national reports on the state and change of forest resources, using statistical surveys and spatial mapping of remotely sensed data. At the global level, the Food and Agriculture Organization (FAO) of the United Nations has conducted a Forest Resources Assessment (FRA) program every 10 years since 1980, producing statistics and analysis that give a global synopsis of forest resources in the world. For the year 2000 of the FRA program (FRA2000), a global forest cover map was produced to provide spatial context to the extensive survey. The forest cover map, produced at the U.S. Geological Survey (USGS) EROS Data Center (EDC), has five classes: closed forest, open or fragmented forest, other wooded land, other land cover, and water. The first two forested classes at the global scale were delineated using combinations of temporal compositing, modified mixture analysis, geographic stratification, and other classification techniques. The remaining three FA O classes were derived primarily from the USGS global land cover characteristics database (Loveland et al. 1999). Validated on the basis of existing reference data sets, the map is estimated to be 77 percent accurate for the first four classes (no reference data were available for water), and 86 percent accurate for the forest and nonforest classification. The final map will be published as an insert to the FAO FRA2000 report, and the map data are available through the EDC web page.

Language English

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The United National Food and Agriculture Organisation (FAO), at the request of the member nations and the world community, regularly reports on status and trends in the world’s forest resources. This paper briefly describes the methods used in past surveys, describes the data and methods to be used to complete the 2000 Forest Resource Assessments, and proposes a follow-on continuous world forest survey system to enable FAO to provide the necessary information on a permanent basis. This paper is based on a background document and on the results of an Expert Advisory Meeting on FRA 2000 held in Rome, Italy on March 6-10, 2000. Keywords: Inventory, Assessment, Monitoring, Global, Satellite, Tropical
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Data about the world’s forest cover is an important prerequisite for global environmental change research, from studies on biodiversity and effective conservation to modeling sustainability of forest ecosystems. Expanding on the recently completed U.S. Geological Survey (USGS) global land cover characteristics database, USGS EROS Data Center is producing a global forest cover map for the United Nations Food and Agriculture Organization (FAO). Broad, discrete forest-canopy cover categories are ma pped at 1-km resolution for use by FAO’s year 2000 Forest Resource Assessment project. Seasonal land cover classes from the USGS database are optimized and adapted to FAO definitions using combinations of remapping, clustering, and linear unmixing techniques. Preliminary forest cover maps have been produced for several continents. Results show that the basic objectives of forest cover mapping and linkage to the USGS database can be met adequately with the methodology.

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