【作者】 任盛明； 梁音； 孙波；

【Author】 Ren Shengming;Liang Yin;Sun Bo;Jiangxi Remote Sensing Information System Center;Nanjing Institute of Soil Science,Chinese Academy of Sciences;ecological and geographical environment monitoring of the State Bureau of Surveying and mapping geographic information main laboratory;

【机构】 江西省遥感信息系统中心； 中国科学院南京土壤研究所； 流域生态与地理环境监测国家测绘地理信息局重点实验室；

【摘要】 选取1:5万、1:10万和1:25万比例尺DEM数据以及30米Landsat TM、10米SPOT遥感卫星影像数据,采用土壤侵蚀宏观监测常规方法—因子叠加法,分析在这些数据支持下提取土壤侵蚀因子的差异及其敏感性,并对不同比例尺DEM支持下土壤侵蚀宏观评价的结果进行比较。结果表明:1)同一区域10米和30米分辨率遥感影像数据提取的土地利用面积变化趋势一致,均能反映当地土地利用规律,分辨率越高,相应解译精度越高;2)两种分辨率影像获取的植被盖度分级面积均能较好的反映流域内的植被盖度趋势,影像数据的获取时相对植被盖度的提取有很大的影响,夏季获取的植被盖度在中高覆盖度的面积高于冬季遥感影像获取的植被盖度面积:3)随着比例尺的减小,坡度分级面积集中在坡度较缓的地形当中,小比例尺地形图坡度面积主要集中在低值区,而大比例尺地形图坡度面积则分布在较高坡度之中,小比例尺地形反映的信息量只能体现地表宏观形态:4)三种比例尺获取土壤侵蚀分级面手只变化规律基本一致,大比例尺地形因子参与下土壤侵蚀强度为轻度和中度所占总面积的比例小于小比例尺地形数据,而中度以上强度侵蚀面积则大干小比例尺地形数据,比例尺的不同影响到侵蚀量的计算,比例尺越大,相应侵蚀量越大。更多还原

【Abstract】 Selected Three scales DEM data and 30 meters Landsat TM,10 meters SPOT Remote sensing satellite image data,using soil erosion macroscopic monitoring conventional method-factor superposition method,Analyze the differences and sensitivity of soil erosion factors extracted from these data,and compare the results of soil erosion in different scale DEM data.The results show that:1) The trend of land use area extracted by remote sensing image data with 10 m and 30 m resolution in the same area can be reflected.The higher the resolution of the local land use,the higher the resolution of the corresponding interpretation;2)the vegetation coverage of the two resolution images which can reflect the trend of vegetation coverage in the basin,and the extraction of the vegetation data has a great influence on the vegetation cover.The coverage of vegetation coverage is higher than that of winter remote sensing images,and the area of vegetation coverage is obtained.(3) With the decrease of scale,The gradient area of the slope is concentrated in the low-lying area,and the small-scale topographic map is mainly concentrated in the low-value area,and the large scale.The terrain map slope area is distributed in the higher slope,the small scale terrain reflects the amount of information can only reflect the surface macroscopic morphology;4) three scales of soil erosion grading is basically the same,and the large soil erosion intensity is mild and Moderate proportion of the total area is smaller than the small scale terrain data,and moderate intensity erosion area is greater than the small scale terrain data,The difference in scale affects the calculation of the amount of erosion,the larger the scale,the greater the amount of erosion.更多还原