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Land salinization of Tongyu County is the one of more serious county in the western Jilin Province. In order to deeply explore the spatial and temporal distribution of land salinization, this thesis researches saline land characteristics and laws of evolution by RS and GIS technology in Tongyu County from 1989 to 2008. The result indicated that Tongyu County saline land area showed a rising trend...
RUSLE, Revised Universal Soil Loss Equation, was used to estimate the average hydraulic erosion modulus of study area in four phases, which were 1976, 1988, 2000 and 2005 respectively. According to the classification standard of hydraulic erosion intensity, hydraulic erosion moduli were classified into different grades. Then, the hydraulic erosion of study area is evaluated dynamically. The study...
Soil erosion is a natural phenomenon of the earth's surface. Different degrees of soil erosion happen in everywhere except the permafrost area. When human society appears, soil erosion has become a dynamic process under the action of the natural and human activities. In recent years, the remote sensing technology (RS) and geographic information systems technology (GIS) have a significant development...
The classification of Remote Sensing images is the very important step during the obtaining of the Remote Sensing information. There are two main methods in image classification: visual interpretation and computer automatic classification. The paper mainly discusses the second method. Taking Chongqing as an example, the information of the land cover type and the attributes of forests, grasslands,...
By utilizing TM/ETM+ remote sensing images from 1984 to 2004 as the major data sources, combining with the field survey to get the rule of dynamic process of Beijing wetland ecosystem, this paper systematic analyzed the hydrology, soil, plant condition of the typical wetland area- Widgeon Lake Wetland Natural Reserve in Beijing. And the results are as follows: In recent years, wetland areas were sharply...
The Ejin Oasis in arid environments suffers with frequent drought due to insufficient water resources and abnormally high summer-temperature. Detailed analysis of remote sensing data has been carried out for the years 2001-2006. Vegetative drought indices like Vegetation Condition Index (VCI) and Temperature Condition Index (TCI) and Vegetation Health Index (VHI) have been derived using Normalized...
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