摘要
在对地观测系统中,Landsat和EO-1数据比较适合于监测城市水体变化。但是这两种传感器数据的水体指数之间的关系不清楚,针对这一问题。该文利用两对同日过空的Landsat-7ETM+与EO-1ALI影像来查明二者水体指数之间的定量关系,通过回归统计分析来求出两种传感器水体指数之间的转换方程。结果表明,Landsat-7ETM+与EO-1ALI影像分别基于DN数据、IACM反射率数据计算的MNDWI水体指数间,均存在较好的线性相关关系,决定系数均在0.75以上;基于EO-1ALI的MNDWI指数影像信息更为丰富,因为其动态范围大于Landsat-7ETM+。
Of the medium-scale earth observation systems, Landsat and EO-1 data are both suitable for monitoring the dynamics of the urban water. Nevertheless, the relationship between the water index of the two sensors has not yet been revealed so far. To quantitatively investigate thisrelationship, this stud- y crossly compares the MNDWI of Landsat-7ETM＋ andEO-1 ALI sensors based on two tandem image pairs. Regression analysis was usedto examine the quantitative relationship through the scatter plots of the water index valuesof the two sensors. This yielded the models for the conversion between two sensors water index. Results indicate that the MNDWI of Landsat ETM＋ and EO-1 ALI have a very strong positive relationship, and the coefficient of determination is higher than 0.75. The MNDWI index imageinformation of EO-1 ALIis more abundant, because of its greater dynamic range.
出处
《测绘科学》
CSCD
北大核心
2016年第11期194-199,共6页
Science of Surveying and Mapping
基金
福建省自然科学基金项目(2012D104)
