摘要
使用先分类后比较的方法,提取南京市1994～2002年间水域变化信息,通过分析1994年和2002年的TM影像光谱特点,发现TM多数波段中水体与居民地的阴影存在一定程度的混淆,实验证明水体信息具有TM2+TM3＞TM4+TM5的特点,再辅以适合的阈值(1994年的TM5＜30,2002年的TM5＜35),可以将水体信息区别于其他所有的地物信息.用ERDAS IMAGINE遥感软件构建水体提取模型,自动提取两个年份的水域面积,并对近10年的水体面积变化进行监测,分析发现,南京市水域增加的面积大于减少的面积.
Information about water area change in Nanjing City from 1994 to 2002 was extracted using TM data through comparison after classification. Analysis of the spectral characteristics of TM images in 1994 and 2002 shows that the shade of most water bodies and residential districts are more or less confused. Through experiments, a characteristic of water body information was found out, i.e. TM2 ＋ TM3 〉 TM4 ＋ TMs. With an additional threshold value （TM5 〈 30 in 1994 and TM5 〈 35 in 2002）, water information can be distinguished from residential districts and all other information. Based on the model established using ERDAS IMAGINE software, water area of two years can be extracted automatically. According to the analysis of water area changed in the past ten years, it is concluded that the water area increased is greater than that declined in Nanjing.
出处
《水资源保护》
CAS
北大核心
2005年第6期31-33,共3页
Water Resources Protection
关键词
水体
光谱分析
遥感数据
南京市
water body
spectral analysis
RS data
Nanjing City
