基于CBERS数据的农区水体透明度遥感模型研究

Study on Modeling for Dynamic Monitoring Transparency of Rural Water-body Based on CBERS Data

以南京溧水县为研究区,以溧水县农区水体为研究对象,利用免费的CBERS的CCD数据和同步监测的农区水体透明度实测数据,结合灰色系统理论进行灰色关联度分析,选取关联度最大的波段组合(b3/b1)作为建模因子,建立农区水体透明度的遥感定量监测模型,探讨农区水体透明度与CBERS影像各波段的相关性。最后应用该模型监测2007年7月30日溧水县的农区水体,监测结果较客观反映了水体透明度的真实分布情况。结果表明:农区水体透明度与CBERS 1、3波段有最好的相关性,所建的农区水体透明度遥感定量监测模型为y=-15 529x3+53 244x2-60 600x+22 938,x=b3/b1(R2=0.92,F=15.26,P=0.01),模型的检验精度较高,已符合建模要求;利用CBERS数据进行农区水体透明度监测具有重要的现实意义和应用前景。

Taking Lishui County in Nanjing as research area,rural water-body of Lishui County was carried out grey related degree analysis based on grey system theory using free CBERS-CCD data and ground data measured synchronously.The biggest related degree wave band group（b3/b1） was chosen as a model factor to build dynamic monitoring model of rural water-body transparency,for studying the correlation of rural water-body transparency and CBERS grey data of four bands.At last the model was applied to rural water-body of Lishui County on July 30th in 2007,the result from monitoring rural water-body using this model revealed the factual distributed situation of water-body transparency objectively.The result showed that rural water-body transparency was correlated with CBERS band 1 and band 3 significantly;modeling for dynamic monitoring rural water-body transparency was y=-15 529x^3＋53 244x^2-60 600x＋22 938,x=b3/b1（R^2=0.92,F=15.26,P=0.01）,with a quite high precision answering for model needing.Using the CBERS data monitoring rural water-body transparency had a great practical significance and application prospect.