pedological criterion affecting desertification in alluvial fans was investigated, for which the map of units was prepared by crossing maps of land use, geology, slope classes and grid layer created by the extension of et geo-wizards in arcgis 10.3. three indices of salinity, erodibility, and permeability of soil were considered and classified. weights of criteria and consistency ratio were cal...

Land desertification is a major challenge to global sustainable development. Therefore, the timely and accurate monitoring of land status can provide scientific decision support for control. The existing automatic interpretation methods are affected by factors such as “same spectrum different matter”, “different same object”, staggered distribution areas, wide ranges ground objects. We propose ...

Abstract Land degradation (LD) poses a major threat to food security, livelihoods sustainability, ecosystem services and biodiversity conservation. The total area of arable land in the world is estimated at 7616 million acres or only 24% surface, currently about half this cultivated. productivity depends mainly on soil formation management. Soil contains mineral components, organic matter micro...

Abstract Desertification is one of the fundamental problems that threaten many arid and semi-arid areas. The formulation of the United Nation Convention to Combat Desertification (UNCCD), adopted in Paris, 1994 and ratified in 1996, with the active participation of Egypt, gave emphasis on combating the major threats to sustainability of dry lands. Recently, different models were developed to fo...

monte carlo methods designed base on stochastic reiterations and can be useful in uncertainty conditions. the purpose of this research was investigation of uncertainty to rank desertification indicators. in order to decrease uncertainty have been applied monte carlo reiterations for each value of indicator, if rank of xi is higher than rank of xk constantly. using multi dimension integrals the ...

H ow healthy are the earth's ecosystems? Will they continue to provide the food, water, shelter, and other necessities on which all life depends? These pressing questions have been receiving attention from two international collaborations: The Pilot Analysis of Global Ecosystems (PAGE) was completed in late 2000 and detailed in World Resources 2000–2001, the biennial report of the World Resourc...

The study and assessment of desertification and/or the advance or retreat arid areas as a function natural anthropogenic causes is necessary for prediction future risks from climate change, to support policymaking, action plans, mitigation measures that can be taken at local global scales. Remote sensing enables modelling, monitoring, behaviour several elements desertification. There have been ...