【摘要】 针对NDWI和MNDWI两种指数在提取水体过程中会产生背景噪音和地物错提的现象,提出一种能够减少无用背景信息的水体提取指数ENDWI,利用TM影像的绿光波段、近红外波段和中红外波段建立归一化比值模型.该方法不仅有良好的水陆分离性,还进一步减少了背景无用信息的干扰,提高了水体提取的精度.以TM/OLI影像为数据源,利用ENDWI法对庐山西海25年的面积变化状况进行监测.结果表明25年间水库面积有增有减,面积平均值为283.99km2,2016年面积达到最大为317.45km2;水库面积的变化是气候水文变化和人类活动共同作用的结果.更多还原

【Abstract】 For the NDWI and MNDWI two kinds of index in the process of extracting water will produce background noise and ground error phenomenon,this paper presents a water extraction index ENDWI that can reduce useless background information.The normalized ratio model was established by using the green band,near infrared band and mid-infrared band of TM image.The method not only has good water and land separation,but also further reduces the interference of background useless information,and improves the accuracy of water extraction.In this paper,the area change of Lushan West Sea is monitored by ENDWI method using TM/OLI image as data source.The results show that the area of the reservoir in 25 years alternately increase or decrease,the average area is 283.99 km2,the area reached the maximum of 317.45 km2 in 2016.The change in the area of the reservoir is the result of the synergistic effect of climate hydrological changes and human activities.更多还原