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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 Field Spec3 spectrometer developed by ASD (Analytical Spectral De-vices) was used to study the field data of the cotton canopy at different sowing dates and growth periods , And analyzed its spectral characteristics and changes. Comparative analysis of the measured spectra and the HSI data of the environment mitigation satellite in the same period to evaluate the effectiveness of HSI applications. The results showed as follows: 1) There was significant difference between 750-950 nm in different growth stages of cotton, so the curve of cotton could be distinguished by different spectral curves. 2) Spectral spectral data of the observed wavelengths in the range of 450-950 nm are selected, and the HSI data of the corresponding bands are transformed. 3) Compared HSI data before and after the correction with the measured spectral reflectance of cotton measured HSI data obtained after atmospheric correction, the true hyperspectral reflectivity obtained, the wavelength range of greater than 700nm correction results and the ground measured values The results show that the reflectance of the other band corrected results is higher than that of the surface observation spectrum, which proves that this analysis provides some examples for the quantitative analysis and application of HSI data.