基于实测光谱的环境减灾卫星HSI数据应用实效性检验

以石河子地区兵团农八师143团10连的棉花大田作为研究区,采用ASD(Analytical Spectral De-vices)公司研制的Field Spec3光谱仪对不同播期、生育期的棉花冠层进行反射光谱野外数据采集,并对其光谱特性和变化规律进行分析。对比分析实测光谱与同期环境减灾卫星HSI数据,评价HSI应用有效性。结果表明:1)不同生育期的棉花在750～950nm间,差异显著,因此可以用光谱曲线来区分不同生育期的棉花。2)选取了波长在450～950nm间实地观测光谱数据波谱特征,并把对应波段的HSI数据进行转化处理。3)运用HSI数据校正前后反射率与实测棉花光谱反射率进行对比,得出HSI数据经过大气校正后,获得的地物真实高光谱反射率,波长大于700nm波段范围内校正结果与地面实测值较一致,其它波段校正后的结果反射率高于地表观测光谱值,说明该分析为HSI数据定量分析与应用提供了一定的实例进行了验证。

The applicable effectiveness of environmental disaster reducing monitoring satellite HSI data based on observational spectrum

Choosing the cotton field of Shihezi region as research area,the simultaneous observational data collected by ASD(Analytical Spectral Devices) field spec spectrometer for the reflection spectrum of cotton canopy in different planting time and growth stage,especially spectral characteristic and change rule were analyzed.And for assessing the applicable effectiveness of HIS data,observational spectrum and HSI data in the corresponding period were studied comparatively.The result showed:1) The spectral curve of cotton in different growth stage represented significant difference between 750 and 950 nm so that it can distinguish cotton in different growth stage.2) the spectral characteristics from observational data in 450-950 nm was selected and HSI data in corresponding spectrum was processed.3)by comparing observational cotton spectral reflection and HSI data which was uncorrected and corrected,we can draw some conclusions.Through atmospheric correction,the wavelength which is more than 700 nm was in accord with the measured value.This research provided instances for the quantitative analysis and application of HIS data validation.