Mapping tropical deforestation in Central Africa.

摘要: The NASA Landsat Pathfinder Humid Tropical Deforestation Project was to map deforestation activities in the humid tropics using datasets from both TM (Thematic Mapper) and MSS (Multispectral Scanner System). In Central Africa, its effort had been constrained by availability of cloud-free satellite coverage, especially for 1970s imagery. Here, we reported rate spatial variability region 18 pairs co-registered imagery 1980s 1990s. Of total classified area 416 000 km, there were approximately 217 km2 dense forest 24 degraded 1980s. A 1012 forest, including 542 470 cleared annually with an annual 0.42%, varying among scenes ranging 0.03 2.72%. Additionally, average 0.12% (ranging 0.01 0.77% scenes) or 257 annually. Regression analyses indicated that extensive occurred areas larger cover, forests. Image interpretation also confirmed hypothesized relationship between accessibility. clearance significantly related rural population density, a positive during 1980s–1990s