干旱区生态环境知识资源中心(Arid): 基于EOS/MODIS的若尔盖高原湿地定量遥感研究

Arid

	基于EOS/MODIS的若尔盖高原湿地定量遥感研究
其他题名	The Wetlands in Zoig Plateau Derived from Quantitative Remote Sensing Based on EOS/MODIS
	许辉熙 1; 何政伟 1; 但尚铭 2; 但玻 2; 杨存建 3
ISSN	1000-0240
出版年	2007
卷号	29 期号:3 页码:450-455
中文摘要	研究旨在探讨EOS/MODIS影像提取若尔盖高原湿地信息的定量遥感方法. 先计算MODIS影像的NDVI并将其线性变换到0～255; 然后经多次试验确定区分湿地与非湿地的MODIS-NDVI阀值, 并用人机交互式调整的方法消除误判像元及云的干扰, 再多次试验得到区分湿地内部沼泽地和水体的阀值; 通过统计不同类型湿地像元数计算湿地面积. 研究表明, 若尔盖高原湿地空间分布和面积具有季节差异, 这与该地区降水和气温季节变化相关; 采用MODIS-NDVI阀值并结合人机交互式调整的方法提取若尔盖高原夏半年的湿地信息是可行的, 精度达到82%, 而利用该方法提取冬半年湿地信息效果不甚理想, 冬半年的MODIS影像湿地判识方法有待进一步探讨.
英文摘要	The method is discussed to extract the data of wetlands in Zoig Plateau by using quantitative remote sensing. First, NDVI is calculated based on ETM band 4 and 3. Through random sample, it is discovered that ETM-NDVI value has obvious difference among water, grassland and marsh in the Zoig Plateau, which provides a theoretic foundation for extracting the wetland data from MODIS image using NDVI method of valve value. Secondly, the MODIS image, including MODIS Band 6 being registrated to Band 1 and Band 2, is pretreated and NDVI is calculated and normalized from 0 to 255. Thirdly, the wetlands are judged and their area is calculated. By the way of human-computer interaction, MODIS-NDVI valve value, which can discriminate wetlands from others, is confirmed through many tests, and the pixel, which is judged incorrectly or disturbed by cloud, is eliminated, and then the valve value, which can discriminate the water and the marshes among the wetlands, is confirmed by using the same method. Lastly, area of the wetlands is calculated by summing up the number of different pixel. This study shows that there are seasonal differences in spatial distribution arid area of wetlands in Zoig Plateau, dependent on precipitation and air temperature. It is feasible to extract spatial distribution and area of wetlands in Zoig Plateau in summer by the method of MODIS-NDVI valve value with the help of an adjustment based on human-computer interaction, reaching a precision of 82% . But those in winter are not satisfactory. Further study how to judge the wetlands from MODIS image is needed.
中文关键词	定量遥感 ; 阀值法 ; 人机交互 ; 若尔盖高原湿地 ; 季节变化
英文关键词	MODIS-NDVI quantitative remote sensing MODIS-NDVI method of valve value human-computer interaction the wetlands in Zoige Plateau season dynamic changes.
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOSCIENCES MULTIDISCIPLINARY
WOS研究方向	Geology
CSCD记录号	CSCD:2830874
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/220676
作者单位	1.成都理工大学,数字国土与生态科学研究所, 成都, 四川 610059, 中国; 2.四川省,农业气象心中, 成都, 四川 610072, 中国; 3.四川师范大学, 省软件重点实验室, 成都, 四川 610066, 中国
推荐引用方式 GB/T 7714	许辉熙,何政伟,但尚铭,等. 基于EOS/MODIS的若尔盖高原湿地定量遥感研究[J],2007,29(3):450-455.
APA	许辉熙,何政伟,但尚铭,但玻,&杨存建.(2007).基于EOS/MODIS的若尔盖高原湿地定量遥感研究.,29(3),450-455.
MLA	许辉熙,et al."基于EOS/MODIS的若尔盖高原湿地定量遥感研究".29.3(2007):450-455.