摘要
通过土地专题遥感信息提取方法的研究,采用分层剔除手段和掩膜技术实现了黄河源区土地覆盖/土地利用变化的多时相信息自动提取与高精度定量化。结果表明,源区20多年来沼泽湿地急剧减少,重度荒漠化土地以6.03％的年速率递增,至2000年时已增至1976年的4.44倍,沙漠面积由1976年的约60km^2扩展至2000年的140km^2。
Through a special study on the method of land remote sensing information extracting, amultitime information auto - extracting and high precision quantitization to the variation of landcover/utilization in the source of Yellow River have been completed by using the techniques of differentialrejecting and membrane - covering. The study indicate that marsh and nunja were decreasing quickly andthe serious desertified land increasing with a velocity of 6.03% per annum. Up to 2000, the area ofserious desertified land is 4.44 times as large as that of 1976 and the area of desert is increasing from 60Km^2 of 1976 to 140 Km^2 of 2000.
关键词
黄河源区
土地覆盖
遥感信息
提取
土地利用
source of Yellow River
land cover/utilization
remote sensing information
extract
