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《Journal of Glaciology and Geocryology》 2007-03
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The Wetlands in Zoig Plateau Derived from Quantitative Remote Sensing Based on EOS/MODIS

XU Hui-xi1,HE Zheng-wei1,DAN Shang-ming2,DAN Bo3,YANG Cun-jian4(1.Institute of Digital Land & Ecological Science,Chengdu University of Technology,Chengdu Sichuan 610072,China;2.Sichuan Province Agrimeteorological Center,Chengdu Sichuan 610072,China;3.Sichuan Provincial Meteorological Observatory,Chengdu Sichuan 610072,China;4.Sichuan Software Key Laboratory,Sichuan Normal University,Chengdu Sichuan 610068,China)  
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 and 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.
【Fund】: 四川省杰出青年学科带头人培养计划项目(06ZQ026-014);; 四川省学术与技术带头人培养基金项目(2200319)资助
【CateGory Index】: P237
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