This study evaluated the reduction effect of non-point source pollution by applying best management practices （BMPs） to a 1.21 km^2 small agricultural watershed using a SWAT （Soil and Water Assessment Tool） model....This study evaluated the reduction effect of non-point source pollution by applying best management practices （BMPs） to a 1.21 km^2 small agricultural watershed using a SWAT （Soil and Water Assessment Tool） model. Two meter QuickBird land use data were prepared for the watershed. The SWAT was calibrated and validated using dally streamflow and monthly water quality （total phosphorus （TP）, total nitrogen （TN）, and suspended solids （SS）） records from 1999 to 2000 and from 2001 to 2002. The average Nash and Sutcliffe model efficiency was 0.63 for the streamflow and the coefficients of determination were 0.88, 0.72, and 0.68 for SS, TN, and TP, respectively. Four BMP scenarios viz. the application of vegetation filter strip and riparian buffer system, the regulation of Universal Soil Loss Equation P factor, and the fertilizing control amount for crops were applied and analyzed.展开更多
图像融合是解决多源遥感图像综合的最有效技术手段,针对不同数据源选择最佳的融合方法是提高图像融合质量的关键。在分析了B ROVEY融合和小波融合的理论、算法和融合过程的基础上,对Q U ICKB IRD的全色波段图像和多光谱波段图像数据进...图像融合是解决多源遥感图像综合的最有效技术手段,针对不同数据源选择最佳的融合方法是提高图像融合质量的关键。在分析了B ROVEY融合和小波融合的理论、算法和融合过程的基础上,对Q U ICKB IRD的全色波段图像和多光谱波段图像数据进行融合实验,然后从定性和定量两个方面对融合效果进行了分析与评价。定性分析是从色调、纹理和清晰度等方面进行分析,而定量分析是根据熵、平均梯度和光谱真实性等指标进行分析,实验结果表明:在处理Q U ICKB IRD遥感图像时,采用小波融合的图像既保持了较高的空间分辨率,又具有较好的光谱特性;而采用B ROVEY融合的图像虽然图像空间分辨率也较高,但光谱信息丢失较大,因此B ROVEY融合方法并不适用于处理Q U ICKB IRD遥感图像。展开更多
GOOGLE EARTH（简称GE）是美国GOOGLE公司于2005年6月推出的全球地理信息系统搜索软件，可以方便快速地搜索到地球上任一地点的影像。影像来自最近3年前的卫星与航空摄影数据，可在全球范围内周期性地更新。其卫星影像部分来自于美国Dig...GOOGLE EARTH（简称GE）是美国GOOGLE公司于2005年6月推出的全球地理信息系统搜索软件，可以方便快速地搜索到地球上任一地点的影像。影像来自最近3年前的卫星与航空摄影数据，可在全球范围内周期性地更新。其卫星影像部分来自于美国DigitalGlobe公司的QuickBird（捷鸟）商业卫星与EarthSat公司（影像来源于陆地卫星LANDSAT-7居多），航拍部分的来源有BlueSky公司（英国）以航拍、GIS／GPS相关业务为主、San-born公司（美国）以GIS、地理数据、空中勘测等业务为主。展开更多
基金supported by a grant (code # 2-2-3) from Sustainable Water Resources Research Center of 21st Century Frontier Research Programthe Development of The Third Korea Multe-Purpose Satellite funded by Ministry of Education Science
文摘This study evaluated the reduction effect of non-point source pollution by applying best management practices （BMPs） to a 1.21 km^2 small agricultural watershed using a SWAT （Soil and Water Assessment Tool） model. Two meter QuickBird land use data were prepared for the watershed. The SWAT was calibrated and validated using dally streamflow and monthly water quality （total phosphorus （TP）, total nitrogen （TN）, and suspended solids （SS）） records from 1999 to 2000 and from 2001 to 2002. The average Nash and Sutcliffe model efficiency was 0.63 for the streamflow and the coefficients of determination were 0.88, 0.72, and 0.68 for SS, TN, and TP, respectively. Four BMP scenarios viz. the application of vegetation filter strip and riparian buffer system, the regulation of Universal Soil Loss Equation P factor, and the fertilizing control amount for crops were applied and analyzed.
文摘图像融合是解决多源遥感图像综合的最有效技术手段,针对不同数据源选择最佳的融合方法是提高图像融合质量的关键。在分析了B ROVEY融合和小波融合的理论、算法和融合过程的基础上,对Q U ICKB IRD的全色波段图像和多光谱波段图像数据进行融合实验,然后从定性和定量两个方面对融合效果进行了分析与评价。定性分析是从色调、纹理和清晰度等方面进行分析,而定量分析是根据熵、平均梯度和光谱真实性等指标进行分析,实验结果表明:在处理Q U ICKB IRD遥感图像时,采用小波融合的图像既保持了较高的空间分辨率,又具有较好的光谱特性;而采用B ROVEY融合的图像虽然图像空间分辨率也较高,但光谱信息丢失较大,因此B ROVEY融合方法并不适用于处理Q U ICKB IRD遥感图像。
