摘要:
深入挖掘寄主光谱响应机制是推进马尾松毛虫害遥感快速监测与预警的必要基础。将采集于福建省长汀县、南平市建阳区的46条马尾松林冠层光谱曲线数据设为规则组,利用单因素方差分析法实现不同危害等级可辨性波长的选择。研究表明,不同危害等级下的马尾松林冠层光谱数据呈现极显著差异(P<0.01),其中,中度—重度危害的马尾松林冠层光谱可辨性在516.51~598.99 nm和700.68~706.18 nm位置上有显著差异(P<0.05),在708.92~810.62 nm位置上有极显著差异(P<0.01)。为此,以519.20 nm,540.72 nm,758.40 nm和785.88 nm波段处光谱反射率为组合,以健康状态下的马尾松林冠层光谱数据为标准样本,基于空间距离法、相关系数法及光谱角制图法分别建立松毛虫危害等级的定量化判定规则,并利用将乐县、南平市延平区、华安县的34条验证组光谱曲线数据对此规则进行验证。结果显示,空间距离法的判定效果远优于相关系数法与光谱角制图法;无松毛虫危害、轻度危害、中度危害以及重度危害的空间距离判定规则依次为:<0.3553,[0.3553,0.7425),[0.7425,0.9631)及≥0.9631,判定精度为88.24%,准确率达97.06%。
Abstract:
The deep mining of host spectral response mechanism is the necessary foundation for Dendrolimus punctatus Walker damage remote sensing fast monitoring and early warning. 46 canopy spectral curve data of Pinus massoniana forests collected in Changting County of Jianyang District were set as the rule group, and the one-way ANOVA was used to realize the distinguished wavelengths selection with different pest levels, and the results showed that there were highly significant differences of pine forests canopy spectral data with different pest levels ( P<0 . 01 ) , in which there were significant differences at 516 . 51~598 . 99 nm and 700 . 68~706 . 18 nm of spectral distinguishability between moderate damage and severe damage ( P<0 . 05 ) , and highly significant differences at 708. 92~810. 62 nm (P<0. 01). Thus, based on the combination of spectral reflectance of 519. 2 nm, 540. 72 nm, 758. 4 nm, 785. 88 nm and taking the healthy pine forests canopy spectral data as the standard sample, the authors constructed the quantitative determination rules of pest levels of Dendrolimus punctatus Walker, relying on the methods of spatial distance, correlation coefficient and spectral angle mapping respectively. The rules were verified with the test group of 34 spectral curve data collected in Jiangle County, Yanping District of Nanping City, and Huaan County, and the results showed that the determination effect of spatial distance method was by far better than that of the correlation coefficient method and spectral angle mapping method. The spatial distance determination rules of non -damage, mild damage, moderate damage and severe Dendrolimus punctatus Walker damages were as follows: <0 . 355 3 , [ 0 . 355 3 , 0 . 742 5 ) , [ 0 . 742 5 , 0 . 963 1 ) and ≥0 . 9631 , with the determination accuracy being 88 . 24% and the accurate rate being 97 . 06%.
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