Landsat TM/OLI和HJ-1B CCD传感器数据的交互对比

Cross-comparison of Landsat TM/OLI and HJ-1B CCD Sensor Data

针对Landsat TM/OLI和HJ-1B CCD的不同传感器交互定标问题,提出了关于不同传感器NDVI、地表反射率两个参数之间的交互对比及转换方程。Landsat系列影像具有较为丰富的历史存档数据,而HJ-1B数据可作为Landsat系列数据的衔接和补充。文章基于同日过境的Landsat TM/OLI和HJ-1B CCD影像对,结合NDVI、地表反射率两个参数,通过数学方法构建Landsat TM/OLI和HJ-1B CCD影像之间的转换方程并对方程的精度进行检验。分析结果表明,Landsat TM/OLI和HJ-1B CCD的观测能力具有很高的一致性,但也存在一定的差异,特别是近红外波段的差异最为明显。在植被观测能力上,HJ-1B CCD能获取更丰富的植被信息,Landsat获取的植被指数信号更佳;在对地观测能力上,HJ-1B CCD获取的地表反射率总体高于Landsat系列数据,但地表反射率在不同波段的表现有所差异。因此,如要应用二者于同一项目,建议进行数据转换,以确保结果的准确对比。

Aiming at the interactive calibration of different sensors of Landsat TM/OLI and HJ-1B CCD,the interactive comparison and conversion equations between the two parameters of NDVI and surface reflectance of different sensors are proposed.The Landsat series of images has rich historical archive data,and HJ-1B data can be used as a link and supplement to the Landsat series of data.Based on the Landsat TM/OLI and HJ-1B CCD image pairs on the same day,combined with NDVI and surface reflectance parameters,the conversion equation between Landsat TM/OLI and HJ-1B CCD images is mathematically constructed and the equation is used.The accuracy is checked.The results show that the observation ability of Landsat TM/OLI and HJ-1B CCD has high consistency,but there are also some differences,especially the difference in the near-infrared band is the most obvious.In the vegetation observation ability,the signal intensity of the Landsat series data is higher than that of the HJ-1B CCD.In the ground observation ability,the surface reflectance obtained by the HJ-1B CCD is higher than that of the Landsat series data,but the performance of surface reflectance is different in different bands.Therefore,if they are to be applied to the same project,it is recommended to perform data conversion to ensure accurate comparison of results.