典型国产卫星高光谱质量对比分析

Comparative analysis of hyperspectral quality of typical domestic satellites

以重庆市为例,选择高分五号(GF5-AHSI)、珠海一号(ZH1-OHS)和资源一号02D(ZY1E-AHSI)等3种国产卫星高光谱数据,在波段选择、大气校正、几何校正的基础上,对比分析3种国产卫星高光谱数据质量和典型地物光谱特性,结果表明:GF5-AHSI、ZH1-OHS和ZY1E-AHSI的信噪比、清晰度和信息熵水平较高,信噪比随波长增加呈现先上升再下降的特点;GF5-AHSI、ZY1E-AHSI数据光谱特性呈现相似性,且条带噪声现象明显,使用前需做噪声去除处理;建筑物在3种数据上光谱响应差异较大,建议构建科学合理的城市不透水层监测模型。分析结果可以为国产星载高光谱数据项目化应用提供基础信息参考。

This paper selects three kinds of domestic satellite-borne hyperspectral data such as GF5-AHSI,ZH1-OHS and ZY1E-AHSI in Chongqing city.On the basis of band selection,atmospheric correction and geometric correction,the data quality and spectral characteristics of typical ground objects are compared and analyzed.The results show that the signal-to-noise ratio,articulation and entropy of GF5-AHSI,ZH1-OHS and ZY1E-AHSI are good,and the signal-to-noise ratio increases first and then decreases with the increase of wavelength.The spectral characteristics of GF5-AHSI and ZY1E-AHSI data are similar,and the strip-noise phenomenon is obvious,which requires noise removal before use.The spectral response of buildings varies greatly in the three kinds of data,so it is suggested to build a scientific and reasonable monitoring model of urban impervious layer.The results can provide basic information reference for the project application of domestic spaceborne hyperspectral data.