IntroductionForest is at the core of terrestrial ecosystems and covers approx-imately 31% of the global land surface.Forest cover and forest cover changes have widespread effects onthe provision of ecosystem services, affect biodiversity, and provideimportant feedbacks to human welfare . In addition, forest cover changes influence the cli-mate by alerting the energy, water and carbon cycles. As the pressure rises of human on climatechange, monitoring forest cover from global to regional scalesis becoming an important component of global change studies.