نتایج جستجو برای: cover change

تعداد نتایج: 689153  

2011
Desheng Liu Shanshan Cai

Temporal trajectories of land-cover change provide important information on landscape dynamics that are critical to our understanding of complex human–environment adaptive systems. The increasing availability of long time series of satellite images, especially the recent free release of multi-decadal Landsat satellite archive, presents a great opportunity to improve our ability to detect land-c...

Journal: :Remote Sensing 2017
Mingde You Anthony M. Filippi Inci Güneralp Burak Güneralp

Accurate characterization of the direction of land change is a neglected aspect of land dynamics. Knowledge on direction of historical land change can be useful information when understanding relative influence of different land-change drivers is of interest. In this study, we present a novel perspective on land-change analysis by focusing on directionality of change. To this end, we employed M...

احمد جلالیان, , حسین خادمی, , مریم یوسفی فرد, ,

Improper use of natural resources, especially soil, causes its degradation and severe soil erosion. Water erosion is an important factor causing soil degradation. Land use change of pasture would result in severe soil erosion mainly due to the reduction of vegetation cover and also surface soil disturbance. The objectives of this study were to estimate the amount of sediment, runoff and nutrien...

Human interventions in natural areas as a change in land use have led to a domino effect of anomalies and then environmental hazards. These extensive and cumulative changes in land cover and land use have manifested themselves in the form of anomalies such as the formation of severe runoff, soil erosion, the spread of desertification, and salinization of the soil. The main purpose of this study...

Jamshid Khatir Namany Morteza Akbarzadeh, Seyyed Ali Hosseini

Studies on vegetation changes of rangelands under grazed and non-grazedconditions are of great importance in the range management planning programs. To determinethe change process of vegetation, this study was performed in Inche Shorezar site of Golestanprovince for nine years (1997-2005). The vegetation parameters were measured every year inseveral fixed plots inside and adjacent of exclosures...

Journal: :Remote Sensing 2016
Ramesh K. Ningthoujam Kevin Tansey Heiko Balzter Keith Morrison Sarah C. M. Johnson France Gerard Charles George Geoff Burbidge Sam Doody Nick Veck Gary M. Llewellyn Thomas Blythe

Assessments of forest cover, forest carbon stocks and carbon emissions from deforestation and degradation are increasingly important components of sustainable resource management, for combating biodiversity loss and in climate mitigation policies. Satellite remote sensing provides the only means for mapping global forest cover regularly. However, forest classification with optical data is limit...

Journal: :Remote Sensing 2014
Marian Vittek Andreas Brink Francois Donnay Dario Simonetti Baudouin Desclée

Monitoring land cover changes from the 1970s in West Africa is important for assessing the dynamics between land cover types and understanding the anthropogenic impact during this period. Given the lack of historical land cover maps over such a large area, Landsat data is a reliable and consistent source of information on land cover dynamics from the 1970s. This study examines land cover change...

2008
Chengquan Huang Kuan Song Sunghee Kim John R.G. Townshend Paul Davis Jeffrey G. Masek Samuel N. Goward

An automated method was developed for mapping forest cover change using satellite remote sensing data sets. This multi-temporal classification method consists of a training data automation (TDA) procedure and uses the advanced support vector machines (SVM) algorithm. The TDA procedure automatically generates training data using input satellite images and existing land cover products. The derive...

Journal: :مرتع و آبخیزداری 0
مریم آذرخشی استادیار دانشگاه تربت‏ حیدریه، دانشکدة کشاورزی و منابع طبیعی، ایران محمد مهدوی استاد دانشگاه تهران، دانشکدة منابع طبیعی، ایران حسن احمدی استاد دانشگاه تهران، دانشکدة منابع طبیعی، ایران حسین ارزانی استاد دانشگاه تهران، دانشکدة منابع طبیعی، ایران جلیل فرزادمهر استادیار دانشگاه تربت‏ حیدریه، دانشکدة کشاورزی و منابع طبیعی، ایران

plants cover composition, condition, trend, production, and grazing capacity of the rangeland change annually. in this research, the role of temporal rainfall distribution on rangeland production was assessed. this research had down in the rangelands of ilam (with semiarid to semi humid climate) and qom and markazi (with arid to semiarid climate) provinces. by attention on plant cover maps in e...

2008
Bethany A. Bradley Erica Fleishman

Land-cover change is a major component of global change (Foley et al., 2005). Many forms of land-cover change, such as deforestation and urbanization, are directly associated with land use. Other land-cover changes, such as melting of permafrost, may be indirectly associated with human activity via anthropogenically induced climate change. Further changes in land cover, such as the expansion of...

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