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Water and soil erosion is one of the most serious global environment. In Yulin Distract this phenomenon is very serious. Based on DEM and other data, using RS and GIS technique, based on general soil erosion equation RULSE model, The study has calculated the quantity of invaded soil in different years, completed the spatial distribution picture of the invaded soil, carried on the dynamic research...
Interferometric baseline plays a very important role in InSAR data processing, and it will directly affect the accuracy of interferometric result. In this article, three classical baseline estimation methods were described. By comparing and combining three methods, a new baseline estimation method and its flow were listed. RADARSAT-2 satellite image data and grid digital elevation model ASTER GDEM...
The production and accuracy analysis of high quality TerraSAR-X DOM are presented. The main focus is given to how to control the accuracy of ortho-rectification framework. Two SpotLight scenes of 1 meter resolution images and two ScanSAR scenes of 3 meter resolution images in China are used as the experimental data. Based on the proposal ortho-rectification framework, the absolute accuracy of TerraSAR-X...
With steep slopes, high mountains, concentrated rainfalls and frequent rainstorms, the agricultural production and economic development of the Wen County, the southernmost county, also heavily damaged by 5.12 Earthquake, of Gansu Province in northwest China, are gravely constrained by serious soil erosion. To make effective soil and water conservation measures, quantitative evaluation of soil erosion...
The estimation of baseline parameters is an important step in SAR interferometry (InSAR) processing and applications, because its accuracy influences directly the quality of the final DEM generated from interferogram. In this paper, some classical methods of baseline parameters estimation, based respectively on precise orbit data, interferogram and Ground Control Points(GCPs), are summarized and compared...
Allowing for catchment hydrological effect due to spatial variability of precipitation and underlying topography, the catchment is divided into a number of basic units of concentration flow within only one channel link by the method of natural divide. The basic unit of concentration flow is regarded as a V-shaped structure, and a distributed watershed concentration flow model is built on a series...
Plant litter is an important carbon pool in the terrestrial carbon balance. Therefore, it is important to acquire the spatial distribution of litter storage at a large scale, in order to predict the effects of environmental changes, such as climate warming and precipitation changes on plant communities. The present study analyzed the spatial distribution of litter storage in China, based on the field...
A distributed watershed runoff and sediment production model, reflecting the influences of the spatial inhomogeneity of underlying surfaces and human activities on watershed runoff and sediment production, is constructed. It can simulate the spatial and temporal processes of runoff and sediment production under different kinds of land utilization, and provide technological support and scientific basis...
Hydrology modeling based on DEMs plays an important role in regional planning, agriculture, forestry and other related fields. In the hydrology modeling, flow accumulation threshold is a critical factor which influences the structure and morphology of stream network. With GeoInformatics tools, such as ArcGIS, it can be explored that what uncertainty influence of flow accumulation threshold on critical...
The Three Gorges Project (TGP) is a vital project in the development and harnessing of the Yangtze River in China. The Three Gorges Reservoir region, while with serious soil erosion for a long time, is one of the typical regions whose ecological environment is very fragile. The objective of this study is to map the inter-annual spatial changing pattern of mean soil erosion and assess the effects of...
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