基于混合像元分解的毛乌素沙地红碱淖面积提取及变化监测

 基于混合像元分解法,利用Landsat卫星遥感数据提取红碱淖湖面面积,监测36 a来红碱淖湖面面积的动态变化。结果表明,1973—2009年红碱淖湖面面积总体减小19.7 km2,变化率为-34%。20世纪70年代,湖面面积较大且变化率较小,1974年湖面面积最大,为59.97 km2;80年代湖面面积开始大幅减小,变化率为-12.4%;90年代湖面面积缩小变慢,变化率为-10.6%;21世纪初,湖面面积萎缩迅速加快,变化率达-16.6%,2009年湖面面积仅为38.33 km2。2001—2002年内湖面面积变化情况监测表明,3—5月湖面面积较大,6—11月湖面面积逐渐缩小。2001年11月到2002年3月,湖面面积处于增大期,变化率为+2.2%;2001年5—11月、2002年3—11月面积缩小,变化率分别为-4.4%、-4.1%。

Extraction and Monitoring of Hongjiannao Lake Area in Mu Us Sandy Land based on Mixed Pixel Decomposition of Remote Sensing Data

Based on the mixed pixel decomposition of remote sensing data,the Hongjiannao Lake area is extracted by making use of Landsat data.The Hongjiannao Lake area shrank by 19.7 km2 during 1973-2009,and the change rate was-34%.In the 1970s,the lake area was bigger and showed little change,and the largest was 59.97 km2 in 1974;It reduced rapidly in the 1980s,and the change rate was-12.4%;In the 1990s,the change rate became smaller,it was-10.6%;The lake area reduced faster in the 2000s,and the change rate reduced t...