Monitoring 25 years of land cover change dynamics in Africa: A sample based remote sensing approach
Monitoring 25 years of land cover change dynamics in Africa: A sample based remote sensing approach
复制标题
DOI：
10.1016/j.apgeog.2008.10.004
复制
发表时间：
2009-12-01
影响因子：
4.9
通讯作者：
Eva, Hugh Douglas
中科院分区：
文献类型：
--
作者：
Brink, Andreas Bernhard;Eva, Hugh Douglas
这项研究调查了撒哈拉以南地区25年来梦寐以求的自然土地资源的变化。我们通过使用高空间分辨率的地球观测卫星，在四个广泛的土地覆盖类别-森林、天然狮子林植被、农业和贫瘠-评估了这些变化。两组样本图像。一次是在1975年，第二次是在2000年。在研究区域内通过分层随机抽样技术进行了选择。目标是每一层的采样率为1%。在生态区域一级提出并在撒哈拉以南地区一级汇总的结果表明，农业面积增加了57%，而自然植被本身在此期间减少了21%。每年损失近500万公顷的森林和非森林自然植被。讨论了这些变化对一个地点的环境和另一个地点的社会经济的影响，并强调了可能对人类福祉造成的压力。(C)2008爱思唯尔有限公司。保留所有权利
The study examines the changes in sub-saharan's natural land covet resources for a 25 year period. We assess these changes in four broad land cover classes - forests, natural lion-forest vegetation, agriculture and barren - by using high spatial resolution Earth observing satellites. Two sets of sample Images. one 'historical' targeted at 1975 and a second 'recent' targeted at the year 2000. have been selected through a stratified random sampling technique over the study area. targeting a sampling rate of 1% in each of the strata. The results, presented at eco-region level and aggregated at sub-Saharan level, show a 57% increase in agriculture area at the expense of natural vegetation which has itself decreased by 21% over the period. with nearly 5 million hectares forest and non-forest natural vegetation lost per year. The impacts of these changes on the environment on one site and on the socio-economy on the other site are discussed and possible pressures oil human well being are highlighted. (c) 2008 Elsevier Ltd. All rights reserved