| 格尔木土地荒漠化遥感动态监测研究 |
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| 引用本文： | 李晓琴,张振德,张佩民.格尔木土地荒漠化遥感动态监测研究[J].国土资源遥感,2006(2):61-63,78. |
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| 作者姓名： | 李晓琴 张振德 张佩民 |
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| 作者单位： | 1. 中国国土资源航空物探遥感中心,100083,北京
2. 有色金属矿产地质调查中心北京资源勘查技术中心,北京,100012 |
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| 摘 要： | 探讨以TM/ETM为主要信息源,在沙漠地区提取专题信息的方法。对TM5/TM7波段进行密度分割,结合DEM数据生成的模板提取水体及盐漠信息;利用NDVI提取植被信息;通过光谱角分类法(SAM)提取沙化土地和盐渍化土地信息。将综合分类结果输入地理信息系统中,利用空间分析功能提取变化信息。结果表明,1996~2000年间,研究区内荒漠化土地明显增加;2000~2002年间荒漠化土地面积变化较小。考虑到研究区地处沙漠环境,人类活动影响较弱,因此地表景观变化的主要影响因素是气候和水文地质条件,而这些自然因素短期内变化不大,所以监测周期至少定为5 a比较合适。
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| 关 键 词： | 光谱角度分类 专题信息提取 荒漠化土地 自动分类监测周期 |
| 文章编号： | 1001-070X（2006）02-0061-03 |
| 收稿时间： | 2005-03-17 |
| 修稿时间： | 2005-03-172006-03-31 |
REMOTE SENSING SURVEY AND MONITORING OF DESERTIFICATION IN GOLMUD AREA |
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| LI Xiao-qin,ZHANG Zhen-de,ZHANG Pei-min.REMOTE SENSING SURVEY AND MONITORING OF DESERTIFICATION IN GOLMUD AREA[J].Remote Sensing for Land & Resources,2006(2):61-63,78. |
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| Authors: | LI Xiao-qin ZHANG Zhen-de ZHANG Pei-min |
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| Abstract: | This paper discusses the methods used for thematic information extraction in desert area with TM/ETM as the main data resource.The water body was extracted by combining density slicing of TM 5 or TM 7 with the terrain mask produced by DEM. NDVI was used to extract vegetation information,and desertification land and salification land information was extracted by the SAM classification method.Confusion matrix shows that the classification precision is 86.2%.The classification results of desertification land and salification land in different years were input into GIS to extract changing information by using spatial analysis.It is shown that from 1994 to 2000,desertification and salification land increased obviously,whereas from 2000 to 2002,desertification and salification land changed only insignificantly.Considering that the study area is located in an arid desert environment short of human activities,and that the main factors affecting landscape change are climate and hydrological conditions which may not change remarkably in a short period,the suitable monitoring period should be five years or so. |
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| Keywords: | SAM Information extract Desertification Monitor period |
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