摘要
利用MODIS资料,分析了长江上游不同水体及其它主要地物在1～7通道的光谱特征,分析发现,水体混合像元在可见光的光谱特征与山体的阴影、云的阴影、城镇等的光谱特征具有很好的相似性,仅采用近红外波段和红光波段的方法不能有效提取出研究区的水体.提出综合采用归一化差分水指数、积雪指数以及可见光、近红外多通道信息的方法,逐步提取出研究区的水体及混合水体像元.
The different water bodies and spectral characteristic of main ground objects in channal 1~7 in the upper reach of Changjiang River were analyzed using the moderate resolution imaging spectroradiometer(MODIS) image data. It is found that the mixed water body pixels in being the characteristic of visible spectrum with that of mountain and cloud shades and city have quite similarity. It is not good to identify mixed water-body only using the red and infrared bands. Normalized Difference Water Index (NDWI), Normalized Difference Snow Index (NDSI), and some band methods are used to progressively identify water body and mixed water body pixel.
出处
《高原气象》
CSCD
北大核心
2004年第z1期141-145,共5页
Plateau Meteorology
基金
科技部公益性研究项目"西南地区洪涝灾害的监测与预报的研究"
科技部基础性研究项目"长江上游生态环境变化监测网络与数据库建设"共同资助
